LORD ABBETT INVESTMENT TRUST
485BPOS, 1999-03-31
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                                                      1933 Act File No. 33-68090
                                                      1940 Act File No. 811-7988


                        SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

           REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933           [X]

           Pre-Effective Amendment No.                                       [ ]

                       Post-Effective Amendment No. 23                       [X]

                                     and/or

           REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT           [X]
                                     OF 1940

                              Amendment No. 23                               [X]

                          LORD ABBETT INVESTMENT TRUST
                Exact Name of Registrant as Specified in Charter

                  767 FIFTH AVENUE, NEW YORK, N. Y. 10153-0203
                      Address of Principal Executive Office

                  Registrant's Telephone Number (212) 848-1800

            Lawrence H. Kaplan, Vice President & Assistant Secretary
                     767 FIFTH AVENUE, NEW YORK, N. Y. 10153
                     (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box)

                immediately on filing pursuant to paragraph (b)
      ---------

          X     on April 1, 1999  pursuant to paragraph (b)
      ---------

                60 days after filing pursuant to paragraph (a)(1)
      ---------

                on (date) pursuant to paragraph (a)(1)
      ---------

                75 days after filing pursuant to paragraph (a)(2)
      ---------

                on (date) pursuant to paragraph (a)(2) of Rule 485
      ---------

If appropriate, check the following box:

      _________ This post-effective amendment designates a new effective date
for a previously filed post-effective amendment.















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LORD
ABBETT
INVESTMENT TRUST

Balanced Series


PROSPECTUS
April 1, 1999


[LOGO]


As with all mutual funds, the Securities and Exchange Commission does not
guarantee that the information in this prospectus is accurate or complete, and
it has not judged this fund for its investment merit. It is a criminal offense
to state otherwise.

Class P shares of the fund are neither offered to the general public nor
available in all states. Please call 800-821-5129 for further information.













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<PAGE>


                               Table of Contents


<TABLE>
<CAPTION>
                                                                            PAGE
<S>                          <C>                                             <C>
                                    The Fund

What you should know         Goal/Approach                                     2
about the fund               Main Risks                                        3
                             Past Performance                                  4
                             Fees and Expenses                                 4


                                Your Investment

Information for managing     Purchases                                         6
your fund account            Opening Your Account                              8
                             Redemptions                                       9
                             Distributions and Taxes                           9
                             Services For Fund Investors                      10
                             Sales Charges and Service Fees                   11
                             Management                                       11
                             

                              For More Information

How to learn more            Other Investment Techniques                      12
about the fund               Glossary of Shaded Terms                         15
                             Recent Performance                               16
                             

                              Financial Information

                             Financial Highlights                             17
                             Compensation For Your Dealer                     19


How to learn more about      Back Cover
the fund and other Lord
Abbett funds
</TABLE>













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                                    The Fund


GOAL / APPROACH

     The Balanced Fund seeks current income and capital growth. To pursue its
     objective, the fund invests in a portfolio of underlying funds managed by
     Lord Abbett. At the date of this prospectus, the underlying funds are:


<TABLE>
<CAPTION>
AFFILIATED FUND             BOND-DEBENTURE FUND        MID-CAP VALUE FUND       
<S>                         <C>                        <C>
  Uses quantitative           Invests in high yield      Focuses on stocks of   
  research on a universe      debt securities,           mid-sized companies.   
  of large, seasoned          sometimes called "junk                            
  companies to identify       bonds," which entail       Attempts to identify   
  bargain stocks.             greater risks than         undervalued stocks     
                              investments in             with potential for     
  Uses fundamental            higher-rated debt          significant market     
  research to determine       securities.                appreciation from      
  a company's prospects                                  growing recognition of 
  for exceeding the           Seeks unusual values,      substantial            
  earnings expectations       particularly in            improvement in         
  reflected in its stock      lower-rated debt           financial results.     
  price.                      securities, some of      
                              which are convertible  
                              into common stocks or  
                              have warrants to       
                              purchase common        
                              stocks.                
</TABLE>


<TABLE>
<CAPTION>
GROWTH OPPORTUNITIES FUND                    U.S. GOVERNMENT SECURITIES FUND      
<S>                                               <C>
  Uses quantitative research on a              Invests in U.S. Government         
  universe of mid-sized companies to           Securities.                        
  identify those with superior growth                                              
  possibilities.                               Seeks high current income          
                                               consistent with reasonable risk,   
  Uses fundamental research to verify          which means that it, over time,    
  companies likely to produce                  will have a volatility             
  superior returns over a thirty-six           approximating that of the Lehman   
  month time frame, by analyzing the           Government Bond Index.             
  dynamics in each company within its         
  industry and within the economy.
</TABLE>


     The fund will decide in which of the underlying funds it will invest at any
     particular time, as well as the relative amounts invested in those funds.
     The fund may change the amounts invested in any or all of the underlying
     funds at any time, but will always have at least 65% of its assets in
     Affiliated Fund and Bond-Debenture Fund, taken together. In addition, it
     will always have at least 25% of its assets invested in fixed-income
     securities through one or more of the underlying funds. As of the fund's
     most recent fiscal year end, 54% of the fund's assets were in Affiliated
     Fund, 45% in Bond-Debenture Fund, and 1% in other assets.

     The fund and each underlying fund may take a temporary defensive position
     by investing some of it's assets in short-time debt securities. This could
     reduce the benefits from any upswing in the market and prevent the fund
     from realizing its investment objective.


WE OR THE FUND refers to the Lord Abbett Balanced Series, ("Balanced Fund") a
portfolio of Lord Abbett Investment Trust (the "company") acting as a fund of
funds by investing in the underlying funds. The fund operates under the
supervision of the company's Board with the advice of Lord, Abbett & Co. ("Lord
Abbett"), its investment manager.

UNDERLYING FUNDS: currently consist of:

   LORD ABBETT AFFILIATED FUND ("Affiliated Fund")

   LORD ABBETT BOND-DEBENTURE FUND ("Bond-Debenture Fund")

   LORD ABBETT MID-CAP VALUE FUND ("Mid-Cap Value Fund")

   LORD ABBETT GROWTH OPPORTUNITIES FUND ("Growth Opportunities Fund")

   U.S. GOVERNMENT SECURITIES SERIES OF LORD ABBETT INVESTMENT TRUST ("U.S.
   Government Securities Fund")

ABOUT THE FUND. The fund is a professionally managed portfolio primarily holding
securities purchased with the pooled money of investors. It strives to reach its
stated goal, although as with all funds, it cannot guarantee results.

LARGE COMPANIES are established companies that are considered "known
quantities." Large companies often have the resources to weather economic
shifts, though they can be slower to innovate than small companies.

SEASONED COMPANIES are usually established companies whose securities have
gained a reputation for quality with the investing public and enjoy high
liquidity in the market.

BARGAIN STOCKS are stocks of companies that appear underpriced according to
certain financial measures of their intrinsic worth or business prospects.


2   The Fund













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MAIN RISKS

     STOCK MARKET RISKS. Three of the underlying funds, Affiliated Fund, Growth
     Opportunities Fund and Mid-Cap Value Fund, are subject to stock market risk
     - i.e., the possibility that stock prices will decline over short or even
     extended periods. The stock market tends to be cyclical, with periods when
     stock prices generally rise and periods when stock prices generally
     decline.

     FIXED-INCOME SECURITIES RISKS. Two of the underlying funds, Bond-Debenture
     Fund and U.S. Government Securities Fund, invest primarily or exclusively
     in fixed-income securities and thus face interest rate risk and credit
     risk.

       Interest Rate Risk. Generally, the prices of fixed-income securities rise
       when interest rates fall and fall when interest rates rise. Longer-term
       bonds are usually more sensitive to interest rate changes. Put another
       way, the longer the maturity of a bond or other debt security, the
       greater the effect a change in interest rates is likely to have on the
       instrument's price.

       Credit Risk. The lower-rated bonds in which the Bond-Debenture Fund
       invests involve risks that the bonds' issuers may not make payments of
       interest and principal payments when they are due. Some issuers may
       default as to principal and/or interest payments after the fund purchases
       their securities.

     An investment in each fund is not a bank deposit. It is not FDIC-insured or
     government endorsed. It is not a complete investment program. You could
     lose money in each fund, but you also have the potential to make money.


MID-SIZED COMPANIES usually have market capitalizations of roughly $500 million
to $5 billion, but not less than $50 million.

HIGH YIELD DEBT SECURITIES OR "JUNK BONDS" are rated BB/Ba or lower or unrated,
and typically pay a higher yield than investment grade debt securities. These
bonds have a higher risk of default than investment grade bonds and their prices
can be much more volatile.

U.S. GOVERNMENT SECURITIES are obligations issued or guaranteed by the U.S.
Government, its agencies or instrumentalities.

You should read this entire prospectus, including "Other Investment Techniques,"
which concisely describes the other investment strategies and their risks used
by the fund.


                                                                    The Fund   3













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<PAGE>


                                     Balanced Fund      Symbols: Class A - LABFX
                                                                 Class C - BFLAX


PAST PERFORMANCE

     The information below provides some indication of the risks of investing in
     the fund, by showing changes in the fund's class A shares' performance from
     calendar year to calendar year and by showing how the fund's average annual
     returns compare with those of a broad measure of market performance.


                                    [GRAPH]

Best Quarter: 11.37%    Worst Quarter: -6.41%
================================================================================
The table below shows a comparison of the fund's class A, B and C average annual
total return to that of Merrill Lynch Wilshire Capital Market Index ("MLWCMI"),
Russell 3000 Index ("R3000I"), 60% Russell 3000 40% LB Agg ("60% R3000 40%
LBA") and Lipper Balanced Funds Average ("LBFA"). Fund returns assume
reinvestment of dividends and distributions and payment of the maximum
applicable front-end or deferred sales charge. All periods end on December 31,
1998.

<TABLE>
<CAPTION>
                                                                                             60% R3000
CLASS                       1 YEAR    INCEPTION(i)     MLWCMI(ii)         R3000I(ii)         40% LBA

<S>                            <C>            <C>            <C>                <C>                <C>
A                             2.50%         12.55%         20.72%(iii)
C                             6.70%         14.22%         22.25%(iv)
MLWCMI(ii)                   18.48%          --             --
R3000I(ii)                   18.48%          --             --
60% R3000 40% LBA(ii)        18.48%          --             --
LBFA(ii)                     18.48%          --             --
- ------------------------------------------------------------------------------------------------------
</TABLE>


FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund.

================================================================================
Fee table
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                  CLASS A  CLASS B   CLASS C  CLASS P

<S>                                                   <C>      <C>       <C>      <C>
SHAREHOLDER FEES (Fees paid directly from your investment)

Maximum Sales Charge on Purchases
(as a % of offering price)                           5.75%    none      none     none

Maximum Deferred Sales Charge (See "Purchases")      none     5.00%(3)  1.00%    none

ANNUAL FUND OPERATING EXPENSES (Expenses deducted
from fund assets) (as a % of average net assets)(1)

Management Fees (See "Management")                   0.75%    0.75%     0.75%    0.75%

Distribution and Service (12b-1) Fees(2)             0.35%    1.00%     1.00%    0.45%

Other Expenses (See "Management")                    0.17%    0.17%     0.17%    0.17%

Total Operating Expenses                             1.27%    1.92%     1.92%    1.37%
- --------------------------------------------------------------------------------------
</TABLE>


Past performance is not a prediction of future results.

- --------------------------------------------------------------------------------
(i)   The dates of inception for class: A -12/27/94; B -5/1/98; and C -7/15/96.

(ii)  Performance for the unmanaged Merrill Lynch Wilshire Capital Market Index
      does not reflect transaction costs or management fees.

(iii) Represents total returns for the period 12/31/94 to 12/31/98, to
      correspond with class A inception date.

(iv)  Represents total returns for the period 7/31/96 to 12/31/98, to correspond
      with class C inception date.


MANAGEMENT FEES are payable to Lord Abbett for the fund's investment management.
LORD ABBETT IS CURRENTLY WAIVING THE MANAGEMENT FEE FOR THE FUND. LORD ABBETT
MAY STOP WAIVING THE MANAGEMENT FEE AT ANY TIME. THE FUND'S MOST RECENT FISCAL
YEAR TOTAL OPERATING EXPENSES WITH THE FEE WAIVER WERE 0.52% (CLASS A SHARES),
1.17% (CLASS B AND C SHARES), AND 0.62% (CLASS P SHARES).

12b-1 FEES refer to fees incurred for activities that are primarily intended to
result in the sale of fund shares and service fees for shareholder account
service and maintenance.

OTHER EXPENSES include fees paid for miscellaneous items such as transfer
agency, legal and share registration fees. The fund has entered into a servicing
arrangement with the underlying funds under which the underlying funds may bear
certain of the fund's other expenses.

- --------------------------------------------------------------------------------
(1) The annual operating expenses have been restated from fiscal year amounts to
    reflect current fees.

(2) Because 12b-1 distribution fees are paid out on an ongoing basis, over time
    they will increase the cost of your investment and may cost you more than
    paying other types of sales charges.

(3) Class B shares will convert to class A shares on the eighth anniversary of
    your original purchase of class B shares.

(4) The ratio shown above is an estimate for the current fiscal year. For its
    most recent fiscal year, Growth Opportunities Fund's expense ratio after fee
    waivers and reimbursements, and excluding any 12b-1 fees which would not be
    applicable to Y shares, was 0%. Without waivers and reimbursements, it would
    have been 1.58%.


4   The Fund













<PAGE>

<PAGE>


     While each class of shares of the fund is expected to operate with the
     direct total operating expenses shown under "Fees and Expenses" above,
     shareholders in the fund bear indirectly the Class Y share expenses of the
     underlying funds in which the fund invests. The following chart provides
     the expense ratio for each of the underlying fund's class Y shares (based
     on information as of each of their most recently completed fiscal years):

<TABLE>
<CAPTION>
                                                   UNDERLYING FUNDS'
                                                   EXPENSE RATIOS

<S>                                                <C>  
Lord Abbett Affiliated Fund                        0.40%
Lord Abbett Bond-Debenture Fund                    0.60%
Lord Abbett Mid-Cap Value Fund                     0.92%
Lord Abbett Growth Opportunities Fund              1.09%(4)
Lord Abbett U.S. Government Securities Fund        0.66%
- --------------------------------------------------------------------------------
</TABLE>

     Based on the expense ratios above and the percentage of the fund's assets
     invested in the underlying funds as of November 30, 1998, the weighted
     average Class Y share expense ratio for the underlying funds is 0.49% (the
     "underlying expense ratio"). This amount is only an approximation of the
     fund's underlying expense ratio, since its assets invested in each of the
     underlying funds changes daily.

================================================================================
Expense example
- --------------------------------------------------------------------------------

This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment at maximum sales charge, if any, 5% total return each year and no
changes in expenses. You pay the following expenses over the course of each
period shown if you sell your shares at the end of the period, although your
actual cost may be higher or lower. The expenses include any applicable
contingent deferred sales charges.

<TABLE>
<CAPTION>
SHARE CLASS                  1 YEAR         3 YEARS       5 YEARS       10 YEARS

<S>                          <C>            <C>           <C>           <C>   
Class A shares               $697           $954          $1,232        $2,023
Class B shares               $695           $903          $1,236        $2,076
Class C shares               $295           $603          $1,036        $2,245
Class P shares               $139           $434          $750          $1,649
- --------------------------------------------------------------------------------
</TABLE>

You would pay the following expenses on the same investment, assuming you kept
your shares.

<TABLE>
<S>                          <C>            <C>           <C>           <C>   
Class A shares               $697           $954          $1,232        $2,023
Class B shares               $195           $603          $1,036        $2,076
Class C shares               $195           $603          $1,036        $2,245
Class P shares               $139           $434          $750          $1,649
- --------------------------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.


                                                                    The Fund   5













<PAGE>

<PAGE>


                                Your Investment


PURCHASES

     This prospectus offers four classes of shares, classes A, B, C and P (call
     800-821-5129 to find out if P shares are available in your state). These
     classes of shares represent investments in the same portfolio of securities
     but are subject to different expenses. Our shares are continuously offered.
     The offering price is based on the Net Asset Value ("NAV") per share next
     determined after we receive your purchase order submitted in proper form. A
     front-end sales charge is added to the NAV, in the case of the class A
     shares. There is no front-end sales charge, although there is a Contingent
     Deferred Sales Charge in the case of the class B and C shares, as described
     below.

     You should read this section carefully to determine which class of shares
     represents the best investment option for your particular situation. It may
     not be suitable for you to place a purchase order for class B shares of
     $500,000 or more, or a purchase order for class C shares of $1,000,000 or
     more. You should discuss pricing options with your investment professional.

     For more information, see "Alternative Sales Arrangements" in the Statement
     of Additional Information.

     We reserve the right to withdraw all or any part of the offering made by
     this prospectus or to reject any purchase order. We also reserve the right
     to waive or change minimum investment requirements. All purchase orders are
     subject to our acceptance and are not binding until confirmed or accepted
     in writing.

================================================================================
Front-End Sales Charges - Class A Shares
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                  TO COMPUTE
                                    AS A              AS A         OFFERING
                                    % OF              % OF          PRICE
                                  OFFERING            YOUR          DIVIDE
YOUR INVESTMENT                     PRICE          INVESTMENT       NAV BY

<S>                                  <C>               <C>            <C>
Less than $50,000                   5.75%             6.10%         .9425
$50,000 to $99,999                  4.75%             4.99%         .9525
$100,000 to $249,999                3.75%             3.90%         .9625
$250,000 to $499,999                2.75%             2.83%         .9725
$500,000 to $999,999                2.00%             2.04%         .9800
$1,000,000 and over                 No Sales Charge                 1.0000
- --------------------------------------------------------------------------------
</TABLE>

     REDUCING YOUR CLASS A FRONT-END SALES CHARGES. Class A shares may be
     purchased at a discount if you qualify under either of the following
     conditions:

       RIGHTS OF ACCUMULATION -- A Purchaser can apply the value (at public
       offering price) of the shares you already own to a new purchase of class
       A shares of any Eligible Fund in order to reduce the sales charge.

       STATEMENT OF INTENTION -- A Purchaser of class A shares can purchase
       additional shares of any Eligible Fund over a 13-month period and receive
       the same sales charge as if you had purchased all shares at once. Shares
       purchased through reinvestment of dividends or distributions are not
       included. A statement of intention can be backdated 90 days. Current
       holdings under rights of accumulation can be included in a statement of
       intention.

     For more information on eligibility for these privileges, read the
     applicable sections in the attached application.


NAV per share for each class of fund shares is calculated each business day at
the close of regular trading on the New York Stock Exchange ("NYSE"). The fund
is open on those business days when the NYSE is open. Purchases and sales of
fund shares are executed at the NAV next determined after the fund receives your
order. In calculating NAV, securities for which market quotations are available
are valued at those quotations. Securities for which such quotations are not
available are valued at fair value under procedures approved by the Board.


Share classes

CLASS A
   normally offered with a front-end sales charge

CLASS B
   no front-end sales charge, however, a contingent deferred sales charge is
   applied to shares sold prior to the sixth anniversary of purchase

   higher annual expenses than class A shares

   automatically convert to class A shares after eight years

CLASS C
   no front-end sales charge

   higher annual expenses than class A shares

   a contingent deferred sales charge is applied to shares sold prior to the
   first anniversary of purchase

CLASS P
   available to certain pension or retirement plans and pursuant to a Mutual
   Fund Advisory Program


6   Your Investment













<PAGE>

<PAGE>


     CLASS A SHARE PURCHASES WITHOUT A FRONT-END SALES CHARGE. Class A shares
     may be purchased without a front-end sales charge under any of the
     following conditions:

        purchases of $1 million or more*

        purchases by Retirement Plans with at least 100 eligible employees*

        purchases under a Special Retirement Wrap Program*

        purchases made with dividends and distributions on class A shares of
        another Eligible Fund

        purchases representing repayment under the loan feature of the Lord
        Abbett-sponsored prototype 403(b) Plan for class A shares

        purchases by employees of any consenting securities dealer having a
        sales agreement with Lord Abbett Distributor

        purchases under a Mutual Fund Advisory Program

        purchases by trustees or custodians of any pension or profit sharing
        plan, or payroll deduction IRA for employees of any consenting
        securities dealer having a sales agreement with Lord Abbett Distributor

     See the Statement of Additional Information for a listing of other
     categories of purchasers who qualify for class A share purchases without a
     front-end sales charge.

     * These categories may be subject to a Contingent Deferred Sales Charge
       ("CDSC").


     CLASS A SHARE CDSC. If you buy class A shares under one of the starred (*)
     categories listed above and you redeem any of them within 24 months after
     the month in which you initially purchased them, the fund normally will
     collect a CDSC of 1%.

     The class A share CDSC generally will be waived for the following
     conditions:

        benefit payments such as Retirement Plan loans, hardship withdrawals,
        death, disability, retirement, separation from service or any excess
        distribution under Retirement Plans (documentation may be required)

        redemptions continuing as investments in another fund participating in a
        Special Retirement Wrap Program


     CLASS B SHARE CDSC. The CDSC for class B shares normally applies if you
     redeem your shares before the sixth anniversary of their initial purchase.
     The CDSC declines the longer you own your shares, according to the
     following schedule:

================================================================================
Contingent Deferred Sales Charges - Class B Shares
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
ANNIVERSARY(1) OF                               CONTINGENT DEFERRED SALES CHARGE
THE DAY ON WHICH THE                            ON REDEMPTION (AS % OF AMOUNT
PURCHASE ORDER WAS ACCEPTED                     SUBJECT TO CHARGE)

On                               Before
- --------------------------------------------------------------------------------

<S>                              <C>            <C>
                                 1st            5.0%
1st                              2nd            4.0%
2nd                              3rd            3.0%
3rd                              4th            3.0%
4th                              5th            2.0%
5th                              6th            1.0%
on or after the 6th(2)                          None
- --------------------------------------------------------------------------------
</TABLE>

(1)  The anniversary is the same calendar day in each respective year after the
     date of purchase. For example, the anniversaries for shares purchased on
     May 1 will be May 1 of each succeeding year.

(2)  Class B shares will automatically convert to class A shares on the eighth
     anniversary of the purchase of class B shares.


CDSC, regardless of class, is not charged on shares acquired through
reinvestment of dividends or capital gains distributions and is charged on the
original purchase cost or the current market value of the shares at the time
they are being sold, whichever is lower. In addition, repayment of loans under
Retirement Plans and 403(b) Plans will constitute new sales for purposes of
assessing the CDSC.

To minimize the amount of any CDSC, the fund redeems shares in the following
order:

1.  shares acquired by reinvestment of dividends and capital gains (always free
    of a CDSC)

2.  shares held for six years or more (class B) or two years or more after the
    month of purchase (class A) or one year or more (class C)

3.  shares held the longest before the sixth anniversary of their purchase
    (class B) or before the second anniversary after the month of purchase
    (class A) or before the first anniversary of their purchase (class C)


RETIREMENT PLANS include employer-sponsored retirement plans under the Internal
Revenue Code, excluding Individual Retirement Accounts.

LORD ABBETT DISTRIBUTOR LLC ("Lord Abbett Distributor") acts as agent for the
funds to work with investment professionals that buy and/or sell shares of the
funds on behalf of their clients. Generally, Lord Abbett Distributor does not
sell fund shares directly to investors.

BENEFIT PAYMENT DOCUMENTATION. (class A only)
   under $50,000 - no documentation necessary

   over $50,000 - reason for benefit payment must be received in writing. Use
   the address indicated under "Opening Your Account."


                                                             Your Investment   7













<PAGE>

<PAGE>


     The class B share CDSC generally will be waived under any one of the
     following conditions:

        benefit payments such as Retirement Plan loans, hardship withdrawals,
        death, disability, retirement, separation from service or any excess
        contribution or distribution under Retirement Plans (documentation may
        be required)

        Eligible Mandatory Distributions under 403(b) Plans and individual
        retirement accounts

        death of the shareholder (natural person)

        redemptions of shares in connection with Div-Move and Systematic
        Withdrawal Plans (up to 12% per year)

     See "Systematic Withdrawal Plan" under "Services For Fund Investors --
     Automatic Services" below for more information on CDSCs with respect to
     class B shares.


     CLASS C SHARE CDSC. The 1% CDSC for class C shares normally applies if you
     redeem your shares before the anniversary of the purchase of such shares.


     CLASS P SHARES. Class P shares have lower annual expenses than class B and
     class C shares, no front-end sales charge, and no CDSC. Class P shares are
     currently sold and redeemed at NAV (a) pursuant to a Mutual Fund Advisory
     Program, or (b) to the trustees of, or employer-sponsors with respect to,
     pension or retirement plans with at least 100 eligible employees (such as a
     plan under Section 401(a), 401(k) or 457(b) of the Internal Revenue Code)
     which engage an investment professional providing or participating in an
     agreement to provide certain recordkeeping, administrative and/or
     sub-transfer agency services to the fund on behalf of the class P
     shareholders.


OPENING YOUR ACCOUNT

     MINIMUM INITIAL INVESTMENT

        Regular account                                                   $1,000

        Individual Retirement Accounts and 403(b) Plans under the
        Internal Revenue Code                                               $250

        Uniform Gifts to Minors Account                                     $250

     For Retirement Plans and Mutual Fund Advisory Programs, no minimum
     investment is required, regardless of share class.

     You may purchase shares through any independent securities dealer who has a
     sales agreement with Lord Abbett Distributor or you can fill out the
     attached application and send it to the fund at the address stated below.
     You should carefully read the paragraph below entitled "Proper Form" before
     placing your order to assure your order will be accepted.

     BALANCED FUND
     P.O. Box 419100
     Kansas City, MO 64141

     PROPER FORM. An order submitted directly to the fund must contain: (1) a
     completed application, and (2) payment by check. For more information
     regarding proper form of a purchase order, call the fund at 800-821-5129.
     Payment must be credited in U.S. dollars to our custodian bank's account.

     BY EXCHANGE. Telephone the fund at 800-821-5129 to request an exchange from
     any eligible Lord Abbett-sponsored fund.


IMPORTANT INFORMATION. You may be subject to a $50 penalty under the Internal
Revenue Code if you do not provide a correct taxpayer identification number
(Social Security Number for individuals) or make certain required
certifications. In addition, we may be required to withhold from your account
and pay to the U.S. Treasury 31% of any redemption proceeds and any dividend or
distribution from your account.


8   Your Investment













<PAGE>

<PAGE>


REDEMPTIONS

     BY BROKER. Call your investment professional for directions on how to
     redeem your shares.

     BY TELEPHONE. To obtain the proceeds of a redemption of $50,000 or less
     from your account, you or your representative can call the fund at
     800-821-5129.

     BY MAIL. Submit a written redemption request indicating, the name(s) in
     which the account is registered, the fund's name, the class of shares, your
     account number, and the dollar value or number of shares you wish to sell.

     Include all necessary signatures. If the signer has any Legal Capacity the
     signature and capacity must be guaranteed by an Eligible Guarantor. Certain
     other legal documentation may be required. For more information regarding
     proper documentation call 800-821-5129.

     Normally a check will be mailed to the name and address in which the
     account is registered (or otherwise according to your instruction) within
     three business days after receipt of your redemption request. Your account
     balance must be sufficient to cover the amount being redeemed or your
     redemption order will not be processed. Redemption requests for shares
     initially purchased by check will not be honored for up to 15 days, unless
     we are assured that the check has cleared earlier.

     To determine if a CDSC applies to a redemption, see "Class A Share CDSC,"
     "Class B Share CDSC" or "Class C Share CDSC."


DISTRIBUTIONS AND TAXES

     The fund pays its shareholders dividends from its net investment income,
     and distributes any net capital gains that it has realized. The fund
     expects to pay income dividends from investment income monthly. If a
     capital gain distribution is declared, the fund expects to pay it annually.
     Your distributions will be reinvested in your fund unless you instruct the
     fund to pay them to you in cash. There are no sales charges on
     reinvestments.

     The tax status of any distribution is the same regardless of how long they
     have been in the fund or whether distributions are reinvested or paid in
     cash. In general, distributions are taxable as follows:

================================================================================
Federal Taxability Of Distributions

<TABLE>
<CAPTION>
                                                         Tax rate for
Type of                     Tax rate for taxpayer        taxpayer subject
distribution                subject to 15% bracket       to 28% bracket or above

<S>                         <C>                          <C>
INCOME                      Ordinary                     Ordinary
DIVIDENDS                   income rate                  income rate

SHORT-TERM                  Ordinary                     Ordinary
CAPITAL GAINS               income rate                  income rate

LONG-TERM
CAPITAL GAINS               10%                          20%
- --------------------------------------------------------------------------------
</TABLE>

     Except in tax-advantaged accounts, any sale or exchange of fund shares may
     be a taxable event.

     ANNUAL INFORMATION - Information concerning the tax treatment of dividends
     and other distributions will be mailed to shareholders each year. The fund
     will also provide annually to its shareholders information regarding the
     source of dividends and distributions of capital gains paid by the fund.
     Because everyone's tax situation is unique, you should consult your tax
     adviser regarding the treatment of those distributions under the federal,
     state and local tax rules that apply to you as well as the tax consequences
     of gains or losses from the redemption or exchange of your shares.


ELIGIBLE GUARANTOR is any broker or bank that is a member of the Medallion Stamp
Program. Most major securities firms and banks are members of this program. A
NOTARY PUBLIC IS NOT AN ELIGIBLE GUARANTOR.

SMALL ACCOUNTS. Our Board may authorize closing any account in which there are
fewer than 25 shares if it is in a fund's best interest to do so.


TAXES ON TRANSACTIONS. The chart at left also can provide a "rule of thumb"
guide for your potential U.S. federal tax liability when selling or exchanging
fund shares. The second row, "Short-term capital gains," applies to fund shares
sold within 12 months of purchase. The third row, "Long-term capital gains,"
applies to shares held for more than 12 months.

Starting January 1, 2001, sales of securities held for more than five years will
be taxed at special lower rates.


                                                             Your Investment   9













<PAGE>

<PAGE>


SERVICES FOR FUND INVESTORS

AUTOMATIC SERVICES

     Buying or selling shares automatically is easy with the services described
     below. With each service, you select a schedule and amount, subject to
     certain restrictions. You can set up most of these services when filling
     out your application or by calling 800-821-5129.

================================================================================
<TABLE>
<CAPTION>
For investing
<S>                   <C>
INVEST-A-MATIC        You can make fixed, periodic investments ($50 minimum) 
(Dollar-cost          into your fund account by means of automatic money     
averaging)            transfers from your bank checking account. See the     
                      attached application for instructions.                 
                      
DIV-MOVE              You can automatically reinvest the dividends and        
                      distributions from your account into another account in 
                      any Eligible Fund ($50 minimum).                        
                      

<CAPTION>
For selling shares
<S>                   <C>
SYSTEMATIC            You can make regular withdrawals from most Lord Abbett     
WITHDRAWAL            funds. Automatic cash withdrawals can be paid to you from  
PLAN ("SWP")          your account in fixed or variable amounts. To establish a  
                      plan, the value of your shares must be at least $10,000,   
                      except for Retirement Plans for which there is no minimum. 
                      Your shares must be in non-certificate form.               
                      
CLASS B SHARES        The CDSC will be waived on redemptions of up to 12% of the  
                      current net asset value of your account at the time of      
                      your SWP request. For class B share redemptions over 12%    
                      per year, the CDSC will apply to the entire redemption.     
                      Please contact the fund for assistance in minimizing the    
                      CDSC in this situation.                                     
                      
CLASS B AND           Redemption proceeds due to a SWP for class B and class C  
C SHARES              shares will be redeemed in the order described under      
                      "Purchases."                                              
- --------------------------------------------------------------------------------
</TABLE>

OTHER SERVICES

     TELEPHONE INVESTING. After we have received the attached application
     (selecting "yes" under Section 7C and completing Section 7), you can
     instruct us by phone to have money transferred from your bank account to
     purchase shares of the fund for an existing account. The fund will purchase
     the requested shares when it receives the money from your bank.

     TELEPHONE EXCHANGES. You or your investment professional, with proper
     identification, can instruct your fund by telephone to exchange shares of
     any class for shares of the same class of any Eligible Fund by calling
     800-821-5129. The fund must receive instructions for the exchange before
     the close of the NYSE on the day of your call. If you meet this
     requirement, you will get the NAV per share of the Eligible Fund determined
     on that day. Exchanges will be treated as a sale for federal tax purposes.
     Be sure to read the current prospectus for any fund into which you are
     exchanging.

     REINVESTMENT PRIVILEGE. If you sell shares of the fund, you have a one time
     right to reinvest some or all of the proceeds in the same class of any
     Eligible Fund within 60 days without a sales charge. If you paid a CDSC
     when you sold your shares, you will be credited with the amount of the
     CDSC. All accounts involved must have the same registration.

     ACCOUNT STATEMENTS. Every Lord Abbett investor automatically receives
     quarterly account statements.

     HOUSEHOLDING. Shareholders with the same last name and address will receive
     a single copy of a prospectus and an annual or semi-annual report, unless
     additional reports are specifically requested in writing to the fund.

     ACCOUNT CHANGES. For any changes you need to make to your account, consult
     your investment professional or call the fund at 800-821-5129.

     SYSTEMATIC EXCHANGE. You or your investment professional can establish a
     schedule of exchanges between the same classes of any Eligible Fund.

Lord Abbett offers a variety of Retirement Plans. Call 800-253-7299 for
information about:

   Traditional, Rollover, Roth and Education IRAs

   Simple IRAs, SEP-IRAs, 401(k) and 403(b) accounts

   Defined Contribution Plans


TELEPHONE TRANSACTIONS. You have this privilege unless you refuse it in writing.
For your security, telephone transaction requests are recorded. We will take
measures to verify the identity of the caller, such as asking for your name,
account number, social security or taxpayer identification number and other
relevant information. The fund will not be liable for following instructions
communicated by telephone that it reasonably believes to be genuine.

Transactions by telephone may be difficult to implement in times of drastic
economic or market change.

Exchanges by telephone should not be used to take advantage of short-term swings
in the market. The fund reserves the right to limit or terminate this privilege
for any shareholder making frequent exchanges or abusing the privilege and may
revoke the privilege for all shareholders upon 60 days' written notice.


10   Your Investment













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<PAGE>


SALES CHARGES AND SERVICE FEES

     SALES AND SERVICE COMPENSATION. As part of its plan for distributing
     shares, the fund and Lord Abbett Distributor pay sales and service
     compensation to Authorized Institutions that sell the fund's shares and
     service its shareholder accounts.

     Sales compensation originates from two sources: sales charges and 12b-1
     distribution fees that are paid out of each fund's assets. Service
     compensation originates from 12b-1 service fees. The 12b-1 fee rates vary
     by share class, according to the Rule 12b-1 plan adopted by the fund. The
     sales charges and 12b-1 fees paid by investors are shown in the
     class-by-class information under "Fees and Expenses" and "Purchases." The
     portion of these expenses that is paid as sales and service compensation to
     Authorized Institutions, such as your dealer, is shown in the chart at the
     end of this prospectus. The portion of such sales and service compensation
     paid to Lord Abbett Distributor is discussed under "Sales Activities" and
     "Service Activities." Sometimes we do not pay sales and service
     compensation where tracking data is not available for certain accounts or
     where the Authorized Institution waives part of the compensation.

     We may pay Additional Concessions to Authorized Institutions from time to
     time.

     SALES ACTIVITIES. We may use 12b-1 distribution fees to pay Authorized
     Institutions to finance any activity which is primarily intended to result
     in the sale of shares. Lord Abbett Distributor uses its portion of the
     distribution fees attributable to a fund's class A and class C shares for
     activities which are primarily intended to result in the sale of such class
     A and class C shares, respectively. These activities include, but are not
     limited to, printing of prospectuses and statements of additional
     information and reports for other than existing shareholders, preparation
     and distribution of advertising and sales material, expenses of organizing
     and conducting sales seminars, Additional Concessions to Authorized
     Institutions, the cost necessary to provide distribution-related services
     or personnel, travel, office expenses, equipment and other allocable
     overhead.

     SERVICE ACTIVITIES. We may pay Rule 12b-1 service fees to Authorized
     Institutions for any activity which is primarily intended to result in
     personal service and/or the maintenance of shareholder accounts. Any
     portion of the service fees paid to Lord Abbett Distributor will be used to
     service and maintain shareholder accounts.


MANAGEMENT

     The fund's investment adviser is Lord, Abbett & Co., 767 Fifth Avenue, New
     York, NY 10153-0203. Founded in 1929, Lord Abbett manages one of the
     nation's oldest mutual fund complexes, with approximately $28 billion in
     more than 35 mutual fund portfolios and other advisory accounts. For more
     information about the services Lord Abbett provides to the funds, see the
     Statement of Additional Information.

     The fund pays Lord Abbett a monthly fee based on average daily net assets
     for each month. For the fiscal year ended November 30, 1998, the fee paid
     to Lord Abbett was at an annual rate of .50 of 1% for the four months ended
     March 31, 1998. Lord Abbett waived its management fee subsequent to that
     date. In addition, the fund pays all expenses not expressly assumed by Lord
     Abbett.

     Lord Abbett uses a team of portfolio managers and analysts acting together
     to manage the fund's investments. Zane E. Brown, Partner and Director of
     Fixed Income of Lord Abbett, heads the team, the other senior members of
     which include Robert G. Morris and W. Thomas Hudson, Jr., each a Partner of
     Lord Abbett, and Eli Salzman, Portfolio Manager. Mr. Brown has been with
     Lord Abbett since 1992. Messrs. Hudson and Morris have been with Lord
     Abbett since 1982 and 1991, respectively. Mr. Salzman joined Lord Abbett in
     1997 and previously was a Vice President with Mutual of America Capital
     Corp. during 1997 and a Vice President with Mitchell Hutchins Asset
     Management, Inc. from 1986 to 1997.


12b-1 FEES ARE PAYABLE REGARDLESS OF EXPENSES. The amounts payable by a fund
need not be directly related to expenses. If Lord Abbett Distributor's actual
expenses exceed the fee payable to it, a fund will not have to pay more than
that fee. If Lord Abbett Distributor's expenses are less than the fee it
receives, Lord Abbett Distributor will keep the full amount of the fee.


                                                            Your Investment   11













<PAGE>

<PAGE>


                              For More Information


OTHER INVESTMENT TECHNIQUES

     This section describes some of the investment techniques that might be used
     by the fund and each underlying fund and their risks.

     ADJUSTING INVESTMENT EXPOSURE. The fund and each underlying fund may, but
     is not required to, use various strategies to change its investment
     exposure to adjust to changing security prices, interest rates, currency
     exchange rates, commodity prices and other factors. These strategies may
     involve buying or selling options and futures contracts, and rights and
     warrants. The fund may use these transactions to change the risk and return
     characteristics of each fund's portfolio. If we judge market conditions
     incorrectly or use a strategy that does not correlate well with the fund's
     investments, it could result in a loss, even if we intended to lessen risk
     or enhance returns. These transactions may involve a small investment of
     cash compared to the magnitude of the risk assumed and could produce
     disproportionate gains or losses. Also, these strategies could result in
     losses if the counterparty to a transaction does not perform as promised.

     AFFILIATED FUND. The investment objective of the Affiliated Fund is
     long-term growth of capital and income without excessive fluctuations in
     market value. The Affiliated Fund uses quantitative research to identify
     those large, seasoned companies whose stocks it believes represent the best
     bargains, fundamental research to assess a company's operating environment,
     resources and strategic plans and to determine its prospects for exceeding
     the earnings expectations reflected in its stock price, and business cycle
     analysis to assess the economic and interest rate sensitivity of its
     portfolio.

     BOND-DEBENTURE FUND. The investment objective of the Bond-Debenture Fund is
     high current income and the opportunity for capital appreciation to produce
     a high total return. Although the Bond-Debenture Fund normally invests in
     high yield debt securities, at least 20% of its assets must be invested in
     any combination of investment grade debt securities, U.S. Government
     securities and cash equivalents.

     BORROWING. Each underlying fund may borrow from banks. If a fund borrows
     money, its share price may be subject to greater fluctuation until the
     borrowing is paid off. Each underlying fund may borrow only for temporary
     or emergency purposes, and not more than 33 1/3% of its total assets.

     CLOSED-END INVESTMENT COMPANIES. The Growth Opportunities Fund may invest
     in shares of closed-end investment companies if bought in the primary or
     secondary market with a fee or commission no greater than the customary
     broker's commission.

     DIVERSIFICATION. Each fund is a diversified fund, which means that with
     respect to 75% of its total assets, it will not purchase a security if, as
     a result, more than 5% of the fund's total assets would be invested in
     securities of a single issuer or the fund would hold more than 10% of the
     outstanding voting securities of the issuer.

     FINANCIAL FUTURES TRANSACTIONS. Financial Futures are exchange-traded
     contract to buy or sell a standard quantity and quality of a financial
     instrument or index at a specific future date and price. The Growth
     Opportunities Fund may purchase and sell futures contracts and options. The
     Growth Opportunities Fund will not enter into any futures contracts or
     options thereon, if the aggregate market value of the securities covered by
     such contracts exceeds 50% of such fund's total assets.


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<PAGE>


     FOREIGN SECURITIES. These securities are not subject to the same degree of
     regulation and may be more volatile and less liquid than securities traded
     in major U.S. markets. Foreign portfolio securities may be traded on days
     when an underlying fund does not value them. Fund share prices could be
     affected on days when an investor cannot purchase or sell shares. Other
     risks include less information on public companies, banks and governments;
     political and social instability; expropriations; higher transaction costs;
     currency fluctuations; nondeductible withholding taxes and different
     accounting and settlement practices.

     The Affiliated Fund may invest up to 10% of its assets, the Bond-Debenture
     Fund up to 20% of its assets, the Growth Opportunities Fund up to 35% of
     its assets and the Mid-Cap Value Fund up to 10% of its assets, measured at
     the time of investment in foreign securities.

     GROWTH OPPORTUNITIES FUND. The Growth Opportunities Fund seeks capital
     appreciation, using a growth style of investing. This means that it favors
     companies that show the potential for stronger than expected earnings or
     growth.

     ILLIQUID SECURITIES. These securities include those that are not traded on
     the open market or that trade irregularly or in very low volume. They may
     be difficult or impossible to sell at the time and price the fund would
     like. Each underlying fund may invest up to 15% of its assets in illiquid
     securities.

     MID-CAP VALUE FUND. The Mid-Cap Value Fund seeks capital appreciation,
     primarily by investing in common stocks of mid-sized companies, using a
     value approach to investing. The fund selects stocks based on capital
     appreciation potential, without regard to current income.

     OPTIONS TRANSACTIONS. A put option on securities gives the purchaser, in
     return for a premium, the right, for a specified period of time, to sell
     the securities subject to the option of the writer (seller) of the put at
     the specified exercise price. The writer of the put option, in return for
     the premium, has the obligation, upon exercise of the option, to acquire
     the securities underlying the option at the exercise price.

     A call option on securities gives the purchaser, in return for a premium
     paid, the right for a specified period of time to purchase the securities
     subject to the option at a specified price (the "exercise price" or "strike
     price"). The writer of a call option, in return for the premium, has the
     obligation, upon exercise of the option, to deliver, depending upon the
     terms of the option contract, the underlying securities to the purchaser
     upon receipt of the exercise price.

     Options on stock indices are similar to options on equity securities except
     that, rather than the right to take or make delivery of stock at a
     specified price, an option on a stock index gives the holder the right, in
     return for a premium paid, to receive, upon exercise of the option, an
     amount of cash if the closing level of the stock index upon which the
     option is based is greater than, in the case of a call, or less than, in
     the case of a put, the exercise price of the option. The writer of an index
     option, in return for a premium, is obligated to pay the amount of cash due
     upon exercise of the option.

     The writer of a put option might be obligated to purchase underlying
     securities for more than their current market value.

     When a fund writes a call option, it gives up the potential for gain on the
     underlying securities in excess of the exercise price of the option during
     the period that the option is open. The Growth Opportunities Fund may
     purchase and write put and call options on equity securities or stock
     indices that are traded on national securities exchanges.

     The Growth Opportunities Fund may purchase foreign currency put options and
     write foreign currency call options on national securities exchanges or
     national over-the-


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<PAGE>

<PAGE>


     counter ("OTC") markets. OTC options are generally less liquid and involve
     issuer credit risk. The premiums paid for Growth Opportunities foreign
     currency put options will not exceed 5% of the net assets of the fund.
     Unlisted options, together with other illiquid securities, may comprise no
     more than 15% of the Growth Opportunities Fund's net assets. The face value
     of currency call option writing or cross-hedging may not exceed 90% of the
     value of the securities denominated in such currency (a) invested in by the
     Growth Opportunities Fund to cover such call writing or (b) to be crossed.

     The Growth Opportunities Fund may only write covered put options to the
     extent that cover for such options does not exceed 25% of the fund's net
     assets. Each fund will not purchase an option if, as a result of such
     purchase, more than 20% of its total assets would be invested in premiums
     for such options. In addition, the Growth Opportunities Fund may write
     covered call options on securities having an aggregate market value not to
     exceed 5% of that fund's assets.

     Each fund will write only "covered" options. The Affiliated, Bond-Debenture
     and Growth Opportunities Funds will only write "covered" call options on
     securities having an aggregate market value not to exceed 10% of the
     Affiliated Fund's assets, 20% of the Bond-Debenture Fund's assets and 25%
     of the Growth Opportunities Fund's assets.

     PORTFOLIO SECURITIES LENDING. Each fund may lend securities to
     broker-dealers and financial institutions as a means of earning income.
     This practice could result in a loss or delay in recovering a fund's
     securities, if the borrower defaults. Each fund will limit its securities
     loans to 30% of its total assets, except the Growth Opportunities Fund is
     5% of its total assets.

     REPURCHASE AGREEMENTS. In a repurchase agreement, a fund buys a security at
     one price from a broker-dealer or financial institution and simultaneously
     agrees to sell the same security back to the same party at a higher price
     in the future. If the other party to the agreement defaults or becomes
     insolvent, the fund could lose money.

     RIGHTS AND WARRANTS. The Growth Opportunities Fund may invest in rights and
     warrants to purchase securities.

     Rights represent a privilege offered to holders of record of issued
     securities (usually on a pro-rata basis) for additional securities of the
     same class, of a different class, or of a different issuer, as the case may
     be. Warrants represent the privilege to purchase securities at a stipulated
     price and are usually valid for several years. Rights and warrants
     generally do not entitle a holder to dividends or voting rights with
     respect to the underlying securities, nor do they represent any rights in
     the assets of the issuing company.

     The value of a right or warrant may not necessarily change with the value
     of the underlying securities, and rights and warrants cease to have value
     if they are not exercised prior to their expiration date.

     RULE 144A SECURITIES. Each fund may invest in Rule 144A securities, which
     are securities determined by the Board to be liquid pursuant to Securities
     and Exchange Commission Rule 144A (the "Rule"). Under the Rule, a
     qualifying unregistered security may be resold to a qualified institutional
     buyer without registration and without regard to whether the seller
     originally purchased the security for investment. A substantial part of the
     lower-rated debt market consists of Rule 144A securities, many of which are
     registered within a few months of their purchases. Investments in Rule 144A
     securities initially determined to be liquid could have the effect of
     diminishing the level of a fund's liquidity during periods of decreased
     market interest in such securities.


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     U.S. GOVERNMENT SECURITIES FUND. The investment objective of the U.S.
     Government Securities Fund is high current income consistent with
     reasonable risk. This means that the fund, over time, will have a
     volatility approximating that of the Lehman Government Bond Index. The fund
     does not seek growth of capital, but capital appreciation may result from
     efforts to secure high current income.

     WHEN-ISSUED OR DELAYED DELIVERY TRANSACTIONS. Each fund may purchase or
     sell securities with payment and delivery taking place as much as a month
     or more later. The fund would do this in an effort to buy or sell the
     securities at an advantageous price and yield. The securities involved are
     subject to market fluctuation and no interest accrues to the purchaser
     during the period between purchase and settlement. At the time of delivery
     of the securities, their market value may be less than the purchase price.
     Also, if a fund commits a significant amount of assets to when-issued or
     delayed delivery transactions, it may increase the volatility of the fund's
     net asset value.


GLOSSARY OF SHADED TERMS

     ADDITIONAL CONCESSIONS. Lord Abbett Distributor may, for specified periods,
     allow dealers to retain the full sales charge for sales of shares or may
     pay an additional concession to a dealer who sells a minimum dollar amount
     of our shares and/or shares of other Lord Abbett-sponsored funds. In some
     instances, such additional concessions will be offered only to certain
     dealers expected to sell significant amounts of shares. Additional
     pay-ments may be paid from Lord Abbett Distributor's own resources or from
     distribution fees received from a fund and will be made in the form of cash
     or, if permitted, non-cash payments. The non-cash payments will include
     business seminars at Lord Abbett's headquarters or other locations,
     including meals and entertainment, or the receipt of merchandise. The cash
     payments may include payment of various business expenses of the dealer.

     In selecting dealers to execute portfolio transactions for a fund's
     portfolio, if two or more dealers are considered capable of obtaining best
     execution, we may prefer the dealer who has sold our shares and/or shares
     of other Lord Abbett-sponsored funds.

     AUTHORIZED INSTITUTIONS. Institutions and persons permitted by law to
     receive service and/or distribution fees under a Rule 12b-1 Plan are
     "Authorized Institutions." Lord Abbett Distributor is an Authorized
     Institution.

     ELIGIBLE FUND. An Eligible Fund is any Lord Abbett-sponsored fund except
     for (1) certain tax-free, single-state funds where the exchanging
     shareholder is a resident of a state in which such series is not offered
     for sale; (2) Lord Abbett Equity Fund; (3) Lord Abbett Series Fund; and (4)
     Lord Abbett U.S. Government Securities Money Market Fund ("GSMMF") (except
     for holdings in GSMMF which are attributable to any shares exchanged from
     the Lord Abbett family of funds). An Eligible Fund also is any Authorized
     Institution's affiliated money market fund satisfying Lord Abbett
     Distributor as to certain omnibus account and other criteria.

     ELIGIBLE MANDATORY DISTRIBUTIONS. If class B shares represent a part of an
     individual's total IRA or 403(b) investment, the CDSC will be waived only
     for that part of a mandatory distribution which bears the same relation to
     the entire mandatory distribution as the B share investment bears to the
     total investment.

     LEGAL CAPACITY. This term refers to the authority of an individual to act
     on behalf of an entity or other person(s). For example, if a redemption
     request were to be made on behalf of the estate of a deceased shareholder,
     John W. Doe, by a person (Robert A. Doe) who has the legal capacity to act
     for the estate of the deceased shareholder because he is the executor of
     the estate, then the request must be executed as follows: Robert A. Doe,


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<PAGE>


     Executor of the Estate of John W. Doe. That signature using that capacity
     must be guaranteed by an Eligible Guarantor.

     To give another example, if a redemption request were to be made on behalf
     of the ABC Corporation by a person (Mary B. Doe) who has the legal capacity
     to act on behalf of the corporation, because she is the president of the
     corporation, the request must be executed as follows: ABC Corporation by
     Mary B. Doe, President. That signature using that capacity must be
     guaranteed by an Eligible Guarantor (see example in right column).

     MUTUAL FUND ADVISORY PROGRAM. Certain unaffiliated authorized brokers,
     dealers, registered investment advisers or other financial institutions who
     either (1) have an arrangement with Lord Abbett Distributor in accordance
     with certain standards approved by Lord Abbett Distributor, providing
     specifically for the use of our shares (and sometimes providing for
     acceptance of orders for such shares on our behalf) in particular
     investment products made available for a fee to clients of such brokers,
     dealers, registered investment advisers and other financial institutions,
     or (2) who charge an advisory, consulting or other fee for their services
     and buy shares for their own accounts or the accounts of their clients.

     PURCHASER. The term "purchaser" includes: (1) an individual, (2) an
     individual and his or her spouse and children under the age of 21, and (3)
     a trustee or other fiduciary purchasing shares for a single trust estate or
     single fiduciary account (including a pension, profit-sharing, or other
     employee benefit trust qualified under Section 401 of the Internal Revenue
     Code - more than one qualified employee benefit trust of a single employer,
     including its consolidated subsidiaries, may be considered a single trust,
     as may qualified plans of multiple employers registered in the name of a
     single bank trustee as one account), although more than one beneficiary is
     involved.

     SPECIAL RETIREMENT WRAP PROGRAM. A program sponsored by an authorized
     institution showing one or more characteristics distinguishing it, in the
     opinion of Lord Abbett Distributor, from a Mutual Fund Advisory Program.
     Such characteristics include, among other things, the fact that an
     authorized institution does not charge its clients any fee of a consulting
     or advisory nature that is economically equivalent to the distribution fee
     under the class A 12b-1 Plan and the fact that the program relates to
     participant-directed Retirement Plans.


RECENT PERFORMANCE

     The Balanced Fund adopted a "fund of funds" format on April 1, 1998 and
     divided assets 60%/40% between shares of Lord Abbett Affiliated Fund
     (equity) and Lord Abbett Bond-Debenture Fund (fixed-income) during the
     third quarter of 1998. (i) In the fourth quarter of 1998, after significant
     equity price increases, we changed the allocation to 55% equity and 45%
     fixed-income. Earlier in the year, Affiliated Fund performance benefited
     from an increased weighting in insurance stocks, which performed well. Fund
     performance was also enhanced by an over-weighting in utility stocks,
     particularly during the third quarter. The overall strategy of
     Bond-Debenture Fund is to identify good bond values while being careful
     about credit selection. Throughout the year, Lord Abbett reduced that
     fund's corporate bond holdings in basic industries such as steel, paper and
     chemicals because Lord Abbett believed there was little opportunity for
     these companies to raise prices on their products. Lord Abbett emphasized
     industries where cash flows are steady, such as telecommunications, media
     and cable television providers. Lord Abbett expects that long-term returns
     can be enhanced due to our selection of well-managed high-yield companies,
     whose bonds represent particularly good value because they are currently
     yielding more than 6% over Treasuries.

GUARANTEED SIGNATURE. An acceptable form of guarantee would be as follows:

   In the case of the estate -

     Robert A. Doe
     Executor of the Estate of
     John W. Doe

     [DATE]

                   SIGNATURE GUARANTEED
                   MEDALLION GUARANTEED
                   (NAME OF GUARANTOR)

                    /s/ David R. Levy
     ------------------------------------------------
                                 AUTHORIZED SIGNATURE

        (960)                                X9003470

     SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                                   SR


   In the case of the corporation -

     ABC Corporation

     Mary B. Doe

     By Mary B. Doe, President

     [DATE]

                   SIGNATURE GUARANTEED
                   MEDALLION GUARANTEED
                   (NAME OF GUARANTOR)

                    /s/ David R. Levy
     ------------------------------------------------
                                 AUTHORIZED SIGNATURE

        (960)                                X9003470

     SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                                   SR


YEAR 2000 ISSUES. Each fund could be adversely affected if the computers used by
each fund and their service providers do not properly process and calculate
date-related information from and after January 1, 2000.

Lord Abbett is working to avoid such problems and has received assurances from
each fund's service providers that they are taking similar steps. Of course, the
Year 2000 problem is unprecedented and, therefore, Lord Abbett cannot eliminate
altogether the possibility that it or the funds will be affected.

(i)   The portfolio is actively managed and as a result, asset allocation may
      change from time to time.


16   For More Information













<PAGE>

<PAGE>


                             Financial Information

FINANCIAL HIGHLIGHTS

     This table describes the fund's performance for the fiscal periods
     indicated. "Total return" shows how much your investment in the fund would
     have increased (or decreased) during each period, assuming you had
     reinvested all dividends and distributions. These Financial Highlights have
     been audited by Deloitte & Touche LLP, the fund's independent auditors, in
     conjunction with their annual audit of the fund's financial statements.
     Financial statements for the fiscal year ended November 30, 1998 and the
     Independent Auditors' Report thereon appear in the Annual Report to
     Shareholders for the fiscal year ended November 30, 1998 and are
     incorporated by reference into the Statement of Additional Information,
     which is available upon request. Certain information reflects financial
     results for a single fund share.

<TABLE>
<CAPTION>
====================================================================================================================
                                                                              CLASS A SHARES
                                                   -----------------------------------------------------------------
                                                                        Period Ended November 30,

Per Share Operating Performance:                     1998          1997         1996(d)       1996         1995(a)
<S>                                                <C>           <C>          <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD               $12.80        $11.81       $11.30        $10.71        $9.52

INCOME FROM INVESTMENT OPERATIONS
  Net investment income                               .54(e)        .47(e)       .0312         .472         .365
  Net realized and unrealized
    gain on investments                               .40          1.15          .5208         .732        1.185
Total from investment operations                      .94          1.62          .552         1.204        1.55

DISTRIBUTIONS
  Dividends from net investment income               (.52)         (.46)        (.0420)       (.462)       (.36)
  Distributions from net realized gain               (.35)         (.17)        --            (.152)        --

NET ASSET VALUE, END OF PERIOD                     $12.87        $12.80       $11.81        $11.30       $10.71

TOTAL RETURN(b)                                      7.69%        14.24%        4.89%(c)     11.55%       16.32%(c)

RATIOS TO AVERAGE NET ASSETS:
  Expenses, including waiver and reimbursement       0.27%(f)      1.10%(f)     0.07%(c)      0.93%        0.37%(c)
  Expenses, excluding waiver and reimbursement       0.92%         1.53%        0.11%(c)      1.59%        1.26%(c)
  Net investment income                              4.28%         3.89%        0.26%(c)      4.18%        4.39%(c)

<CAPTION>
====================================================================================================================
                                               CLASS B SHARES                      CLASS C SHARES
                                                ------------     ---------------------------------------------------
                                                Period Ended                        Period Ended
                                                November 30,                        November 30,

Per Share Operating Performance:                     1998(a)       1998         1997          1996(d)      1996(a)
<S>                                                <C>           <C>          <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD               $13.14        $12.78       $11.79        $11.29       $10.73

INCOME FROM INVESTMENT OPERATIONS
  Net investment income                               .25(e)        .41(e)       .35(e)        .0067        .0349
  Net realized and unrealized
    gain (loss) on investments                       (.28)          .40         1.15           .5298        .6346
Total from investment operations                     (.03)          .81         1.50           .5365        .6695

DISTRIBUTIONS
  Dividends from net investment income               (.25)         (.39)        (.34)         (.0365)      (.0730)
  Distributions from net realized gain               --            (.35)        (.17)         --           (.0365)

NET ASSET VALUE, END OF PERIOD                     $12.86        $12.85       $12.78        $11.79       $11.29

TOTAL RETURN(b)                                     (0.16)%(c)     6.62%       13.14%         4.76%(c)     7.78%(c)

RATIOS TO AVERAGE NET ASSETS:
  Expenses, including waiver and reimbursement       0.61%(c)(f)   1.26%(f)     2.08%(f)      0.16%(c)     0.62%(c)
  Expenses, excluding waiver and reimbursement       1.26%(c)      1.91%        2.51%         0.20%(c)     0.77%(c)
  Net investment income                              1.98%(c)      3.24%        2.88%         0.17%(c)     0.70%(c)

<CAPTION>
====================================================================================================================
                                                                        Period Ended November 30,
                                                   -----------------------------------------------------------------

SUPPLEMENTAL DATA FOR ALL CLASSES:                   1998          1997         1996(d)       1996         1995(a)
<S>                                                <C>           <C>          <C>           <C>           <C>
NET ASSETS, END OF PERIOD (000)                   $57,675       $20,340      $11,406       $10,988       $5,713

PORTFOLIO TURNOVER RATE                            131.36%       216.07%      10.05%        187.78%      131.80%
====================================================================================================================
</TABLE>

(a)  Commencement of offering (class A shares: December 27, 1994; class B
     shares: May 1, 1998 and class C shares: July 15, 1996) respective class
     shares.

(b)  Total return does not consider the effects of sales loads and assumes
     reinvestment of all distributions.

(c)  Not annualized.

(d)  For the one month ended November 30, 1996.

(e)  Calculated using average shares outstanding during the period.

(f)  The ratios for 1998 and 1997 include expenses paid through an expense
     offset arrangement.


See Notes to Financial Statements.

                                                      Financial Information   17













<PAGE>

<PAGE>


LINE GRAPH COMPARISON

     Immediately below is a comparison of a $10,000 investment in class A shares
     to the same investment in the Merrill Lynch Wilshire Capital Market Index,
     assuming reinvestment of all dividends and distributions.


                                    [GRAPH]

          Fiscal Year-end 11/30

     The fund (class A shares) at net asset value
     The fund (class A shares) maximum offering price(1)
     Merrill Lynch Wilshire Capital Market Index(2)
     Russell 3000 Index(2)
     60% Russel 300 40% LB Agg Index(2)
     Lipper Balanced Funds Average(2)

================================================================================
<TABLE>
<CAPTION>
                Average Annual Total Return At Maximum Applicable
              Sales Charge For The Periods Ending November 30, 1998

                    1 YEAR           10 YEARS (OR LIFE)

<S>                 <C>              <C>   
Class A(3)          1.60%            12.31%
Class C(4)          5.55%            13.86%
- --------------------------------------------------------------------------------
</TABLE>


- --------------------------------------------------------------------------------
(1)  This shows total return which is the percent change in value, after
     deduction of the maximum initial sales charge of 5.75% applicable to class
     A shares, with all dividends and distributions reinvested for the periods
     shown ending November 30, 1998 using the SEC-required uniform method to
     compute such return.

(2)  Performance for the unmanaged Merrill Lynch Wilshire Capital Market Index
     does not reflect transaction costs, management fees or sales charges.

(3)  The class A shares were first offered on 12/27/94. Performance reflects the
     deduction of a CDSC of 5.75%.

(4)  The class C shares were first offered on 7/15/96. Performance is at net
     asset value.


18   Financial Information













<PAGE>

<PAGE>


COMPENSATION FOR YOUR DEALER

<TABLE>
<CAPTION>
====================================================================================================================================
                                                      FIRST YEAR COMPENSATION

                           Front-end
                           sales charge                 Dealer's
                           paid by investors            concession                  Service fee(1)             Total compensation(2)
Class A investments        (% of offering price)        (% of offering price)       (% of net investment)      (% of offering price)
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                        <C>                          <C>                         <C>                        <C>  
Less than $50,000          5.75%                        5.00%                       0.25%                      5.24%
$50,000 - $99,999          4.75%                        4.00%                       0.25%                      4.24%
$100,000 - $249,999        3.75%                        3.25%                       0.25%                      3.49%
$250,000 - $499,999        2.75%                        2.25%                       0.25%                      2.49%
$500,000 - $999,999        2.00%                        1.75%                       0.25%                      2.00%
- ------------------------------------------------------------------------------------------------------------------------------------

$1 million or more(3) or Retirement Plan - 100 or more eligible employees(3) or
Special Retirement Wrap Program(3)

First $5 million           no front-end sales charge    1.00%                       0.25%                      1.25%
Next $5 million 
  above that               no front-end sales charge    0.55%                       0.25%                      0.80%
Next $40 million
  above that               no front-end sales charge    0.50%                       0.25%                      0.75%
Over $50 million           no front-end sales charge    0.25%                       0.25%                      0.50%
- ------------------------------------------------------------------------------------------------------------------------------------
Class B investments                                       Paid at time of sale (% of net asset value)
All amounts                no front-end sales charge    3.75%                       0.25%                      4.00%
- ------------------------------------------------------------------------------------------------------------------------------------
Class C investments
All amounts                no front-end sales charge    0.75%                       0.25%                      1.00%
- ------------------------------------------------------------------------------------------------------------------------------------
Class P investments                                       Percentage of average net assets
All amounts                no front-end sales charge    0.25%                       0.20%                      0.45%
====================================================================================================================================


<CAPTION>
                                               ANNUAL COMPENSATION AFTER FIRST YEAR
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                        <C>                          <C>                         <C>                        <C>  
Class A investments
All amounts                no front-end sales charge    none                        0.25%                      0.25%
- ------------------------------------------------------------------------------------------------------------------------------------
Class B investments                                       Percentage of average net assets(4)
All amounts                no front-end sales charge    none                        0.25%                      0.25%
- ------------------------------------------------------------------------------------------------------------------------------------
Class C investments
All amounts                no front-end sales charge    0.75%                       0.25%                      1.00%
- ------------------------------------------------------------------------------------------------------------------------------------
Class P investments                                       Percentage of average net assets
All amounts                no front-end sales charge    0.25%                       0.20%                      0.45%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1)  The service fee for class A and P shares are paid quarterly. The first
     year's service fee on class B and C shares is paid at the time of sale.

(2)  Dealer's concession percentages and service fee percentages are calculated
     from different amounts, and therefore may not equal total compensation
     percentages if combined using simple addition. Additional Concessions may
     be paid to Authorized Institutions from time to time.

(3)  Concessions are paid at the time of sale on all class A shares sold during
     any 12-month period starting from the day of the first net asset value
     sale. With respect to (a) class A share purchases at $1 million or more,
     sales qualifying at such level under rights of accumulation and statement
     of intention privileges are included and (b) for Special Retirement Wrap
     Programs, only new sales are eligible and exchanges into the fund are
     excluded.

(4)  With respect to class B, C and P shares, 0.25%, 1.00% and 0.45%,
     respectively, of the average annual net asset value of such shares
     outstanding during the quarter (including distribution reinvestment shares
     after the first anniversary of their issuance) is paid to Authorized
     Institutions. These fees are paid quarterly in arrears.


                                                      Financial Information   19













<PAGE>

<PAGE>


                       THIS PAGE INTENTIONALLY LEFT BLANK













<PAGE>

<PAGE>


     More information on this fund is available free upon request, including the
     following:


ANNUAL/SEMI-ANNUAL REPORT

     Describes the fund, lists portfolio holdings and contains a letter from the
     fund's manager discussing recent market conditions and the fund's
     investment strategies.


STATEMENT OF ADDITIONAL INFORMATION ("SAI")

     Provides more details about the fund and their policies. A current SAI is
     on file with the Securities and Exchange Commission ("SEC") and is
     incorporated by reference (is legally considered part of this prospectus).



Lord Abbett Investment Trust -
   Balanced Series

The General Motors Building
767 Fifth Avenue
New York, NY 10153-0203
- ---------------------------
SEC file number: 811-7988


To obtain information:

BY TELEPHONE. Call the fund at:
800-426-1130

BY MAIL. Write to the fund at:
The Lord Abbett Family of Fund
767 Fifth Avenue
New York, NY 10153-0203

VIA THE INTERNET.
LORD, ABBETT & CO.
http://www.lordabbett.com

Text only versions of fund documents can be viewed online or downloaded from:
SEC
http://www.sec.gov

You can also obtain copies by visiting the SEC's Public Reference Room in
Washington, DC (phone 800-SEC-0330) or by sending your request and a duplicating
fee to the SEC's Public Reference Section, Washington, DC 20549-6009.


LAIT-BAL-1-499

(4/99)













<PAGE>

<PAGE>

LORD
ABBETT

             High Yield Fund



PROSPECTUS
April 1, 1999



LORD ABBETT & CO. [LOGO]


          As with all mutual funds, the Securities and Exchange Commission does
          not guarantee that the  information in this  prospectus is accurate
          or complete, and it has not judged this fund for its investment
          merit. It is a criminal offense to state otherwise.

          Class P shares of the fund are neither offered to the general public
          nor available in all states. Please call  800-821-5129 for further
          information.















<PAGE>

<PAGE>



                                Table of Contents
<TABLE>
<CAPTION>
                                                                          PAGE
                              The Fund

<S>                                  <C>                                    <C>
            What you should know     Goal/Approach                          2 
                  about the fund     Main Risks                             2 
                                     Fees and Expenses                      3 
                                     
                          Your Investment
        
        Information for managing     Purchases                              4  
               your fund account     Opening Your Account                   6  
                                     Redemptions                            7  
                                     Distributions and Taxes                7  
                                     Services For Fund Investors            8  
                                     Sales Charges and Service Fees         9  
                                     Management                            10  
                                     
                        For More Information
        
               How to learn more     Other Investment Techniques           11  
                  about the fund     Glossary of Shaded Terms              12  
                                     
                        Financial Information
        
                                     Compensation For Your Dealer          14

     How to learn more about the
fund and other Lord Abbett funds     Back Cover
</TABLE>














<PAGE>

<PAGE>


                                    The Fund


GOAL / APPROACH

     The fund's investment objective is to seek high current income and the
     opportunity for capital appreciation to produce a high total return.
     Normally, we invest in lower-rated debt securities, sometimes called "junk
     bonds," which entail greater risks than investments in higher-rated debt
     securities.

     We believe that a high total return (current income and capital
     appreciation) may be derived from an actively managed, diversified security
     portfolio. Under normal circumstances, we invest at least 65% of our total
     assets in lower-rated debt securities, some of which are convertible into
     common stock or have warrants to purchase common stock.

     We seek unusual values, particularly in lower-rated debt securities, some
     of which are convertible into common stocks or have warrants to purchase
     common stocks. Higher yield on debt securities can occur during periods of
     inflation when the demand for borrowed funds is high. Also, buying
     lower-rated bonds when the credit risk is above average but, we think,
     likely to decrease, may generate higher yields.

     While typically fully invested, we may take a temporary defensive position
     by investing some of our assets in short-term debt securities. This could
     reduce the benefit from any upswing in the market.

MAIN RISKS

     The lower-rated bonds in which the fund invests involve risks that the
     bond's issuers will not make payments of interest and principal payments
     when due. Some issuers may default as to principal and/or interest payments
     after we purchase their securities. Through portfolio diversification,
     credit analysis and attention to current developments and trends in
     interest rates and economic conditions, we attempt to reduce investment
     risk, but losses may occur. In addition, the value of your investment will
     change as interest rates fluctuate. When interest rates decline, share
     value may rise. When interest rates rise, share value may decline. The fund
     uses investment practices, such as investments in foreign securities,
     illiquid securities and other securities, that could adversely affect
     performance.

     An investment in the fund is not a bank deposit. It is not FDIC-insured or
     government endorsed. It is not a complete investment program. You could
     lose money in the fund, but you also have the potential to make money.

     WE OR THE FUND refers to Lord Abbett High Yield Fund ("High Yield Fund").
     The fund is a series of Lord Abbett Investment Trust (the "company"), which
     operates under the supervision of the company's Board, with the advice of
     Lord, Abbett & Co. ("Lord Abbett"), its investment manager.

     ABOUT THE FUND. The fund is a professionally managed portfolio primarily
     holding securities purchased with the pooled money of investors. It strives
     to reach its stated goal, although as with all funds, it cannot guarantee
     results.

     HIGH YIELD DEBT SECURITIES. The fund may invest all of its assets in high
     yield debt securities. High yield debt securities or "junk bonds" are rated
     BB/Ba or lower and typically pay a higher yield than investment grade debt
     securities. These bonds have a higher risk of default than investment grade
     bonds and their prices can be much more volatile.

     FOREIGN SECURITIES are securities primarily traded in countries outside the
     United States. These securities are not subject to the same degree of
     regulation and may be more volatile and less liquid than securities traded
     in major U.S. markets. Other considerations include political and social
     instability, expropriations, higher transaction costs, currency
     fluctuations, nondeductable withholding taxes and different settlement
     practices.

     You should read this entire prospectus, including "Other Investment
     Techniques," which concisely describes the other investment strategies and
     their risks used by the fund.

2 The Funds














<PAGE>

<PAGE>


                                                                 High Yield Fund

FEES AND EXPENSES

     This table describes the fees and expenses that you may pay if you buy and
hold shares of the fund.
<TABLE>
<CAPTION>
==============================================================================================
FEE TABLE
- ----------------------------------------------------------------------------------------------
                                                          CLASS A   CLASS B   CLASS C  CLASS P
<S>                                                        <C>       <C>       <C>       <C>          
SHAREHOLDER FEES (Fees paid directly from your investment)                             
- ----------------------------------------------------------------------------------------------
Maximum Sales Charge on Purchases                                                      
- ----------------------------------------------------------------------------------------------
(as a % of offering price)                                 4.75%     none      none      none
- ----------------------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")            none      5.00%(1)  1.00%     none
- ----------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES (Expenses deducted from                                 
fund assets) (as a % of average net assets)(2)                                         
- ----------------------------------------------------------------------------------------------
Management Fees (See "Management")                         0.60%     0.60%     0.60%     0.60%
- ----------------------------------------------------------------------------------------------
Distribution and Service (12b-1) Fees(3)                   0.35%     1.00%     1.00%     0.45%
- ----------------------------------------------------------------------------------------------
Other Expenses (See "Management")                          0.25%     0.25%     0.25%     0.25%
- ----------------------------------------------------------------------------------------------
Total Operating Expenses                                   1.20%     1.85%     1.85%     1.30%
- ----------------------------------------------------------------------------------------------
</TABLE>

================================================================================
EXPENSE EXAMPLE
- --------------------------------------------------------------------------------
This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment at maximum sales charge, if any, 5% total return each year and no
changes in expenses. You pay the following expenses over the course of each
period shown if you sell your shares at the end of the period, although your
actual cost may be higher or lower. The expenses include any applicable
contingent deferred sales charges.

<TABLE>
<CAPTION>
SHARE CLASS       1 YEAR    3 YEARS       5 YEARS     10 YEARS
<S>                <C>        <C>          <C>         <C>   
Class A shares     $591       $838         $1,103      $1,863
- --------------------------------------------------------------
Class B shares     $688       $881         $1,200      $2,001
- --------------------------------------------------------------
Class C shares     $288       $581         $1,000      $2,171
- --------------------------------------------------------------
Class P shares     $132       $412         $  713      $1,570
- --------------------------------------------------------------
You would pay the following expenses on the same investment, assuming you kept
your shares.

Class A shares     $591         $838       $1,103      $1,863
- --------------------------------------------------------------
Class B shares     $188         $581       $1,000      $2,001
- --------------------------------------------------------------
Class C shares     $188         $581       $1,000      $2,171
- --------------------------------------------------------------
Class P shares     $132         $412       $  713      $1,570
- --------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.


MANAGEMENT FEES are payable to Lord Abbett for the fund's investment management.

12b-1 FEES refer to fees for activities that are primarily intended to result in
the sale of fund shares and service fees for shareholder account service and
maintenance.

OTHER EXPENSES include fees paid by the fund for miscellaneous items such as
transfer agency, legal and share registration fees.

- --------------------------------------------------------------------------------
(1) Class B shares will automatically convert to class A shares on the eighth
    anniversary of your original purchase of class B shares.

(2) The annual operating expenses are based on estimated expenses for the
    current fiscal year.

(3) Because 12b-1 distribution fees are paid out on an ongoing basis, over time
    these fees will increase the cost of your investment and may cost you more
    than paying other types of sales charges.

                                                                     The Funds 3















<PAGE>

<PAGE>


                                Your Investment

PURCHASES

     This prospectus offers four classes of shares, classes A, B, C and P (call
     800-821-5129 to find out if class P shares are available in your state).
     Although a fund may have more than one class of shares, these different
     classes represent investments in the same portfolio of securities but are
     subject to different expenses. Our shares are continuously offered. The
     offering price is based on the Net Asset Value ("NAV") per share next
     determined after we receive your purchase order submitted in proper form. A
     front-end sales charge is added to the NAV in the case of the class A
     shares. There is no front-end sales charge although there is a Contingent
     Deferred Sales Charge in the case of the class B and C shares, as described
     below.

     You should read this section carefully to determine which class of shares
     represents the best investment option for your particular situation. It may
     not be suitable for you to place a purchase order for class B shares of
     $500,000 or more, or a purchase order for class C shares of $1,000,000 or
     more. You should discuss pricing options with your investment professional.

     For more information, see "Alternative Sales Arrangements" in the Statement
     of Additional Information.

     We reserve the right to withdraw all or any part of the offering made by
     this prospectus or to reject any purchase order. We also reserve the right
     to waive or change minimum investment requirements. All purchase orders are
     subject to our acceptance and are not binding until confirmed or accepted
     in writing.

================================================================================
Front-End Sales Charges - Class A Shares
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                           AS A % OF        AS A % OF     TO COMPUTE OFFERING
YOUR INVESTMENT         OFFERING PRICE   YOUR INVESTMENT  PRICE DIVIDE NAV BY
================================================================================
<S>                          <C>               <C>              <C>  
Less than $50,000            4.75%             4.99%            .9525
- --------------------------------------------------------------------------------
$50,000 to $99,999           4.75%             4.99%            .9525
- --------------------------------------------------------------------------------
$100,000 to $249,999         3.75%             3.90%            .9625
- --------------------------------------------------------------------------------
$250,000 to $499,999         2.75%             2.83%            .9725
- --------------------------------------------------------------------------------
$500,000 to $999,999         2.00%             2.04%            .9800
- --------------------------------------------------------------------------------
$1,000,000 and over          No Sales Charge                   1.0000
- --------------------------------------------------------------------------------
</TABLE>

     REDUCING YOUR CLASS A FRONT-END SALES CHARGES. Class A shares may be
     purchased at a discount if you qualify under either of the following
     conditions:

       RIGHTS OF ACCUMULATION -- A Purchaser can apply the value (at public
       offering price) of the shares you already own to a new purchase of class
       A shares of any Eligible Fund in order to reduce the sales charge.

       STATEMENT OF INTENTION -- A Purchaser of class A shares can purchase
       additional shares of any Eligible Fund over a 13-month period and receive
       the same sales charge as if you had purchased all shares at once. Shares
       purchased through reinvestment of dividends and distributions are not
       included. A statement of intention can be back-dated 90 days. Current
       holding under rights of accumulation can be included in a statement of
       intention.

     For more information on eligibility for these privileges, read the
     applicable sections in the attached application.


     NAV per share for each class of fund shares is calculated each business day
     at the close of regular trading on the New York Stock Exchange ("NYSE").
     The fund is open on those business days when the NYSE is open. Purchases
     and sales of fund shares are executed at the NAV next determined after the
     fund receives your order. In calculating NAV, securities for which market
     quotations are available are valued at those quotations. Securities for
     which such quotations are not available are valued at fair value under
     procedures approved by the Board.

     Share classes

     CLASS A

       normally offered with a front-end sales charge

     CLASS B

       no front-end sales charge, however, a contingent deferred sales charge
       is applied to shares sold prior to the sixth anniversary of purchase

       higher annual expenses than class A shares

       automatically convert to class A shares after eight years

     CLASS C

       no front-end sales charge

       higher annual expenses than class A shares

       a contingent deferred sales charge is applied to shares sold prior to the
       first anniversary of purchase

     CLASS P

       available to certain pension or retirement plans and pursuant to a Mutual
       Fund Advisory Program

4 Your Investment














<PAGE>

<PAGE>

     CLASS A SHARE PURCHASES WITHOUT A FRONT-END SALES CHARGE. Class A shares
     may be purchased without a front-end sales charge under any of the
     following conditions:

       purchases of $1 million or more*

       purchases by Retirement Plans with at least 100 eligible employees*

       purchases under a Special Retirement Wrap Program*

       purchases made with dividends and distributions on class A shares of
       another Eligible Fund

       purchases representing repayment under the loan feature of the Lord
       Abbett-sponsored prototype 403(b) Plan for class A shares

       purchases by employees of any consenting securities dealer having a sales
       agreement with Lord Abbett Distributor

       purchases under a Mutual Fund Advisory Program

       purchases by trustees or custodians of any pension or profit sharing
       plan, or payroll deduction IRA for employees of any consenting securities
       dealer having a sales agreement with Lord Abbett Distributor

     See the Statement of Additional Information for a listing of other
     categories of purchasers who qualify for class A share purchases without a
     front-end sales charge.

     *These categories may be subject to a Contingent Deferred Sales Charge
      ("CDSC").

     CLASS A SHARE CDSC. If you buy class A shares under one of the starred (O)
     categories listed above and you redeem any of them within 24 months after
     the month in which you initially purchased them, the fund normally will
     collect a CDSC of 1%.

     The class A share CDSC generally will be waived for the following
     conditions:

       benefit payments such as Retirement Plan loans, hardship withdrawals,
       death, disability, retirement, separation from service or any excess
       distribution under Retirement Plans (documentation may be required)

       redemptions continuing as investments in another fund participating in a
       Special Retirement Wrap Program

     CLASS B SHARE CDSC. The CDSC for class B shares normally applies if you
     redeem your shares before the sixth anniversary of their initial purchase.
     The CDSC declines the longer you own your shares, according to the
     following schedule:

================================================================================
CONTINGENT DEFERRED SALES CHARGES - CLASS B SHARES
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
ANNIVERSARY(1) OF                          CONTINGENT DEFERRED SALES CHARGE
THE DAY ON WHICH THE                       ON REDEMPTIONS (AS A % OF AMOUNT
PURCHASE ORDER WAS ACCEPTED                SUBJECT TO CHARGE)

On                                 Before            
- --------------------------------------------------------------------------------
<S>                                <C>                 <C> 
                                   1st                 5.0%
- --------------------------------------------------------------------------------
1st                                2nd                 4.0%
- --------------------------------------------------------------------------------
2nd                                3rd                 3.0%
- --------------------------------------------------------------------------------
3rd                                4th                 3.0%
- --------------------------------------------------------------------------------
4th                                5th                 2.0%
- --------------------------------------------------------------------------------
5th                                6th                 1.0%
- --------------------------------------------------------------------------------
on or after the 6th(2)                                 None
- --------------------------------------------------------------------------------
</TABLE>

(1) The anniversary is the same calendar day in each respective year after the
    date of purchase. For example, the anniversaries for shares purchased on May
    1 will be May 1 of each succeeding year.

(2) Class B shares will automatically convert to class A shares on the eighth
    anniversary of the purchase of class B shares.

     CDSC, regardless of class, is not charged on shares acquired through
     reinvestment of dividends or capital gains distributions and is charged on
     the original purchase cost or the current market value of the shares at the
     time they are being sold, whichever is lower. In addition, repayment of
     loans under Retirement Plans and 403(b) Plans will constitute new sales for
     purposes of assessing the CDSC.

     To minimize the amount of any CDSC, the fund redeems shares in the
     following order:

     1. shares acquired by reinvestment of dividends and capital gains (always
        free of a CDSC)

     2. shares held for six years or more (class B) or two years or more after
        the month of purchase (class A) or one year or more (class C)

     3. shares held the longest before the sixth anniversary of their purchase
        (class B) or before the second anniversary after the month of purchase
        (class A) or before the first anniversary of their purchase (class C)

     RETIREMENT PLANS include employer-sponsored retirement plans under the
     Internal Revenue Code, excluding Individual Retirement Accounts.

     LORD ABBETT DISTRIBUTOR LLC ("Lord Abbett Distributor") acts as agent for
     the funds to work with investment professionals that buy and/or sell shares
     of the funds on behalf of their clients. Generally, Lord Abbett Distributor
     does not sell fund shares directly to investors.

     BENEFIT PAYMENT DOCUMENTATION. (class A only)

       under $50,000 - no documentation necessary

       over $50,000 - reason for benefit payment must be received in writing.
       Use the address indicated under "Opening Your Account."

                                                               Your Investment 5














<PAGE>

<PAGE>


     The class B share CDSC generally will be waived under any one of the
     following conditions:

       benefit payments such as Retirement Plan loans, hardship withdrawals,
       death, disability, retirement, separation from service or any excess
       contribution or distribution under Retirement Plans

       Eligible Mandatory Distributions under 403(b) Plans and individual
       retirement accounts

       death of the shareholder (natural person)

       redemptions of shares in connection with Div-Move and Systematic
       Withdrawal Plans (up to 12% per year)

     See "Systematic Withdrawal Plan" under "Services For Fund Investors --
     Automatic Services" below for more information on CDSCs with respect to
     class B shares.

     CLASS C SHARE CDSC. The 1% CDSC for class C shares normally applies if you
     redeem your shares before the anniversary of the purchase of such shares.

     CLASS P SHARES. Class P shares have lower annual expenses than class B and
     class C shares, no front-end sales charge, and no CDSC. Class P shares are
     currently sold and redeemed at NAV (a) pursuant to a Mutual Fund Advisory
     Program, or (b) to the trustees of, or employer-sponsors with respect to,
     pension or retirement plans with at least 100 eligible employees (such as a
     plan under Section 401(a), 401(k) or 457(b) of the Internal Revenue Code)
     which engage an investment professional providing or participating in an
     agreement to provide, certain recordkeeping, administrative and/or
     sub-transfer agency services to the fund on behalf of the class P
     shareholders.

OPENING YOUR ACCOUNT

     MINIMUM INITIAL INVESTMENT
<TABLE>
<S>                                                            <C>   
       Regular account                                         $1,000
       Individual Retirement Accounts and
       403(b) Plans under the Internal Revenue Code              $250
       Uniform Gifts to Minors Account                           $250
</TABLE>

     For Retirement Plans and Mutual Fund Advisory Programs, no minimum
     investment is required, regardless of share class.

     You may purchase shares through any independent securities dealer who has a
     sales agreement with Lord Abbett Distributor or you can fill out the
     attached application and send it to the address stated below. You should
     carefully read the paragraph below entitled "Proper Form" before placing
     your order to assure your order will be accepted.

     HIGH YIELD FUND
     P.O. Box 419100
     Kansas City, MO 64141

     PROPER FORM. An order submitted directly to the fund must contain: (1) a
     completed application, and (2) payment by check. For more information
     regarding proper form of a purchase order, call the fund at 800-821-5129.
     Payment must be credited in U.S. dollars to our custodian bank's account.

     BY EXCHANGE. Telephone the fund at 800-821-5129 to request an exchange from
     any eligible Lord Abbett-sponsored fund.

     IMPORTANT INFORMATION. You may be subject to a $50 penalty under the
     Internal Revenue Code if you do not provide a correct taxpayer
     identification number (Social Security Number for individuals) or make
     certain required certifications. In addition, we may be required to
     withhold from your account and pay to the U.S. Treasury 31% of any
     redemption proceeds and of any dividend or distribution from your account.

6 Your Investment














<PAGE>

<PAGE>


REDEMPTIONS

     BY BROKER. Call your investment professional for directions on how to
     redeem your shares.

     BY TELEPHONE. To obtain the proceeds of a redemption of $50,000 or less
     from your account, you or your representative can call the fund at
     800-821-5129.

     BY MAIL. Submit a written redemption request indicating the name(s) in
     which the account is registered, the fund's name, the class of shares, your
     account number, and the dollar value or number of shares you wish to sell.

     Include all necessary signatures. If the signer has any Legal Capacity, the
     signature and capacity must be guaranteed by an Eligible Guarantor. Certain
     other legal documentation may be required. For more information regarding
     proper documentation call 800-821-5129.

     Normally a check will be mailed to the name and address in which the
     account is registered (or otherwise according to your instruction) within
     three business days after receipt of your redemption request. Your account
     balance must be sufficient to cover the amount being redeemed or your
     redemption order will not be processed. Redemption requests for shares
     initially purchased by check will not be honored for up to 15 days, unless
     we are assured that the check has cleared earlier.

     To determine if a CDSC applies to a redemption, see "Class A Share CDSC,"
     "Class B Share CDSC" or "Class C Share CDSC."

DISTRIBUTIONS AND TAXES

     The fund pays its shareholders dividends from its net investment income,
     and distributes net capital gains that it has realized. The fund expects to
     pay such income dividends to shareholders monthly. If a capital gain
     distribution is declared, it is expected to be paid annually. Your
     distributions will be reinvested in the fund unless you instruct the fund
     to pay them to you in cash. There are no sales charges on reinvestments.

     The tax status of distributions are the same for all shareholders
     regardless of how long they have been in the fund or whether distributions
     are reinvested or paid in cash. In general, distributions are taxable as
     follows:

================================================================================
FEDERAL TAXABILITY OF DISTRIBUTIONS

<TABLE>
<CAPTION>
Type of               Tax rate for taxpayer        Tax rate for taxpayer subject
distribution          subject to 15% bracket        to 28% bracket or above
- --------------------------------------------------------------------------------
<S>                   <C>                           <C>
INCOME                Ordinary Income               Ordinary Income
DIVIDENDS             Rate                          Rate
- --------------------------------------------------------------------------------
SHORT-TERM            Ordinary Income               Ordinary Income
CAPITAL GAINS         Rate                          Rate
- --------------------------------------------------------------------------------
LONG-TERM            
CAPITAL GAINS         10%                           20%
- --------------------------------------------------------------------------------
</TABLE>



     Except in tax-advantaged accounts, any sale or exchange of fund shares may
     be a taxable event.

     ANNUAL INFORMATION -- Information concerning the tax treatment of dividends
     and other distributions will be mailed to shareholders each year. The fund
     will also provide annually to its shareholders information regarding the
     source of dividends and distributions of capital gains by that fund.
     Because everyone's tax situation is unique, you should
     consult your tax adviser regarding the treatment of those distributions
     under the federal, state and local tax rules that apply to you as well as
     the tax consequences of gains or losses from the redemption or exchange of
     your shares.

     SMALL ACCOUNTS. Our Board may authorize closing any account in which there
     are fewer than 25 shares if it is in a fund's best interest to do so.

     ELIGIBLE GUARANTOR is any broker or bank that is a member of the Medallion
     Stamp Program. Most major securities firms and banks are members of this
     program. A NOTARY PUBLIC IS NOT AN ELIGIBLE GUARANTOR.

     TAXES ON TRANSACTIONS. The chart at left also can provide a "rule of thumb"
     guide for your potential U.S. federal tax liability when selling or
     exchanging fund shares. The second row, "Short-term capital gains," applies
     to fund shares sold within 12 months of purchase. The third row, "Long-term
     capital gains," applies to shares held for more than 12 months.

     Starting January 1, 2001, sales of securities held for more than five years
     will be taxed at special lower rates.

     Any gains realized on the fund's transactions in options and financial
     futures will be treated as taxable long- or short-term capital gains.

                                                          Your Investment      7














<PAGE>

<PAGE>



SERVICES FOR FUND INVESTORS

AUTOMATIC SERVICES

     Buying or selling shares automatically is easy with the services described
     below. With each service, you select a schedule and amount, subject to
     certain restrictions. You can set up most of these services when filling
     out your application or by calling 800-821-5129.

================================================================================
For investing
<TABLE>

<S>                <C>

INVEST-A-MATIC     You can make fixed, periodic investments ($50 minimum) into 
(Dollar-cost       your fund account by means of automatic money transfers from
averaging)         your bank checking account. See the attached application for
                   instructions.                                               

DIV-MOVE           You can automatically reinvest the dividends and             
                   distributions from your account into another account in any  
                   Eligible Fund ($50 minimum).                                 

</TABLE>

For selling shares
<TABLE>
<S>                <C>
SYSTEMATIC         You can make regular withdrawals from most Lord Abbett     
WITHDRAWAL         funds. Automatic cash withdrawals can be paid to you from  
PLAN ("SWP")       your account in fixed or variable amounts. To establish a  
                   plan, the value of your shares must be at least $10,000,   
                   except for Retirement Plans for which there is no minimum. 
                   Your shares must be in non-certificate form.               
                   
CLASS B SHARES     The CDSC will be waived on redemptions of up to 12% of the  
                   current net asset value of your account at the time of your 
                   SWP request. For class B share redemptions over 12% per     
                   year, the CDSC will apply to the entire redemption. Please  
                   contact the fund for assistance in minimizing the CDSC in   
                   this situation.                                             
                   
CLASS B AND        Redemption proceeds due to a SWP for class B and class C 
C SHARES           shares will be redeemed in the order described under     
                   "Purchases."                                             
================================================================================
</TABLE>

OTHER SERVICES

     TELEPHONE INVESTING. After we have received the attached application
     (selecting "yes" under Section 7C and completing Section 7), you can
     instruct us by phone to have money transferred from your bank account to
     purchase shares of the fund for an existing account. The fund will purchase
     the requested shares when it receives the money from your bank.

     TELEPHONE EXCHANGES. You or your investment professional, with proper
     identification, can instruct your fund by telephone to exchange shares of
     any class for shares of the same class of any Eligible Fund by calling
     800-821-5129. The fund must receive instructions for the exchange before
     the close of the NYSE on the day of your call. If you meet this
     requirement, you will get the NAV per share of the Eligible Fund determined
     on that day. Exchanges will be treated as a sale for federal tax purposes.
     Be sure to read the current prospectus for any fund into which you are
     exchanging.

     REINVESTMENT PRIVILEGE. If you sell shares of the fund, you have a one time
     right to reinvest some or all of the proceeds in the same class of any
     Eligible Fund within 60 days without a sales charge. If you paid a CDSC
     when you sold your shares, you will be credited with the amount of the
     CDSC. All accounts involved must have the same registration.

     Lord Abbett offers a variety of Retirement Plans.

     Call 800-253-7299 for information about:

       Traditional, Rollover, Roth and Education IRAs

       Simple IRAs, SEP-IRAs, 401(k) and 403(b) accounts

       Defined Contribution Plans

     TELEPHONE TRANSACTIONS. You have this privilege unless you refuse it in
     writing. For your security, telephone transaction requests are recorded. We
     will take measures to verify the identity of the caller, such as asking for
     your name, account number, social security or taxpayer identification
     number and other relevant information. The fund will not be liable for
     following instructions communicated by telephone that it reasonably
     believes to be genuine.

     Transactions by telephone may be difficult to implement in times of drastic
     economic or market change.

     Exchanges by telephone should not be used to take advantage of short-term
     swings in the market. The fund reserves the right to limit or terminate
     this privilege for any shareholder making frequent exchanges or abusing the
     privilege and may revoke the privilege for all shareholders upon 60 days'
     written notice.

8 Your Investment














<PAGE>

<PAGE>

     ACCOUNT STATEMENTS. Every Lord Abbett investor automatically receives
     quarterly account statements.

     HOUSEHOLDING. Shareholders with the same last name and address will receive
     a single copy of a prospectus and an annual or semi-annual report, unless
     additional reports are specifically requested in writing to the fund.

     ACCOUNT CHANGES. For any changes you need to make to your account, consult
     your investment professional or call the fund at 800-821-5129.

     SYSTEMATIC EXCHANGE. You or your investment professional can establish a
     schedule of exchanges between the same classes of any Eligible Fund.

SALES CHARGES AND SERVICE FEES

     SALES AND SERVICE COMPENSATION. As part of its plan for distributing
     shares, the fund and Lord Abbett Distributor pay sales and service
     compensation to Authorized Institutions that sell the fund's shares and
     service its shareholder accounts.

     Sales compensation originates from two sources: sales charges and 12b-1
     distribution fees that are paid out of the fund's assets. Service
     compensation originates from 12b-1 service fees. The 12b-1 fee rates vary
     by share class, according to the Rule 12b-1 plan adopted by the fund. The
     sales charges and 12b-1 fees paid by investors are shown in the
     class-by-class information under "Fees and Expenses" and "Purchases." The
     portion of these expenses that is paid as sales and service compensation to
     Authorized Institutions, such as your dealer, is shown in the chart at the
     end of this prospectus. The portion of such sales and service compensation
     paid to Lord Abbett Distributor is discussed under "Sales Activities" and
     "Service Activities." Sometimes we do not pay sales and service
     compensation where tracking data is not available for certain accounts or
     where the Authorized Institution waives part of the compensation.

     We may pay Additional Concessions to Authorized Institutions from time to
     time.

     SALES ACTIVITIES. We may use 12b-1 distribution fees to pay Authorized
     Institutions to finance any activity which is primarily intended to result
     in the sale of shares. Lord Abbett Distributor uses its portion of the
     distribution fees attributable to the fund's class A and class C shares for
     activities that are primarily intended to result in the sale of such class
     A and class C shares, respectively. These activities include, but are not
     limited to, printing of prospectuses and statements of additional
     information and reports for those other than existing shareholders,
     preparation and distribution of advertising and sales material, expenses of
     organizing and conducting sales seminars, Additional Concessions to
     Authorized Institutions, the cost necessary to provide distribution-related
     services or personnel, travel, office expenses, equipment and other
     allocable overhead.

     SERVICE ACTIVITIES. We may pay Rule 12b-1 service fees to Authorized
     Institutions for any activity which is primarily intended to result in
     personal service and/or the maintenance of shareholder accounts. Any
     portion of the service fees paid to Lord Abbett Distributor will be used to
     service and maintain shareholder accounts.

     12b-1 FEES ARE PAYABLE REGARDLESS OF EXPENSES. The amounts payable by a
     fund need not be directly related to expenses. If Lord Abbett
     Distributor's actual expenses exceed the fee payable to it, a fund will
     not have to pay more than that fee. If Lord Abbett Distributor's expenses
     are less than the fee it receives, Lord Abbett Distributor will keep the
     full amount of the fee.

                                                               Your Investment 9














<PAGE>

<PAGE>


MANAGEMENT

     The fund's investment adviser is Lord, Abbett & Co., 767 Fifth Avenue, New
     York, NY 10153-0203. Founded in 1929, Lord Abbett manages one of the
     nation's oldest mutual fund complexes, with approximately $28 billion in
     more than 35 mutual fund portfolios and other advisory accounts. For more
     information about the services Lord Abbett provides to the fund, see the
     Statement of Additional Information.

     The fund pays Lord Abbett a monthly fee based on the average daily net
     assets for each month. In addition, the fund pays all expenses not
     expressly assumed by Lord Abbett.

     Lord Abbett uses a team of portfolio managers and analysts acting together
     to manage the fund's investments. Christopher J. Towle, Partner of Lord
     Abbett, heads the team, the other senior members of which include Richard
     Szaro, Michael Goldstein and Thomas Baade. Messrs. Towle and Szaro have
     been with Lord Abbett since 1988 and 1983, respectively. Mr. Goldstein has
     been with Lord Abbett since 1997. Before joining Lord Abbett, Mr. Goldstein
     was a bond trader for Credit Suisse BEA Associates from August 1992 through
     April 1997. Mr. Baade joined Lord Abbett in 1998; prior to that he was a
     credit analyst with Greenwich Street Advisors.

10 Your Investment














<PAGE>

<PAGE>


                              For More Information

OTHER INVESTMENT TECHNIQUES

     This section describes some of the investment techniques that might be used
     by the fund and their risks.

     ADJUSTING INVESTMENT EXPOSURE. The fund may, but is not required to, use
     various strategies to change its investment exposure to adjust to changing
     security prices, interest rates, currency exchange rates, commodity prices
     and other factors. These strategies may involve buying or selling
     derivative instruments, such as options and futures contracts. The fund may
     use these transactions to change the risk and return characteristics of its
     portfolio. If we judge market conditions incorrectly or use a strategy that
     does not correlate well with the fund's investments, it could result in a
     loss, even if we intended to lessen risk or enhance returns. These
     transactions may involve a small investment of cash compared to the
     magnitude of the risk assumed and could produce disproportionate gains or
     losses. Also, these strategies could result in losses if the counterparty
     to a transaction does not perform as promised.

     BORROWING. The fund may borrow from banks. If the fund borrows money, its
     share price may be subject to greater fluctuation until the borrowing is
     paid off. The fund may borrow only for temporary or emergency purposes, and
     not in an amount exceeding 33 1/3% of its total assets.

     EQUITY SECURITIES. The fund may also invest up to 20% of its total assets
     in equity securities. These include common stocks, preferred stocks,
     convertible securities, warrants, and similar instruments. Common stocks,
     the most familiar type, represent an ownership interest in a corporation.
     Although equity securities have a history of long-term growth in their
     value, their prices fluctuate based on changes in a company's financial
     condition and on market and economic conditions.

     FOREIGN SECURITIES. The fund will limit its investments in foreign
     securities to 20% of its total assets. These securities are not subject to
     the same degree of regulation and may be more volatile and less liquid than
     securities traded in major U.S. markets. Foreign portfolio securities may
     trade on days when the fund does not value them. Fund share prices could be
     affected on days an investor cannot purchase or sell shares. Other risks
     include less information on public companies, banks and governments;
     political and social instability; expropriations; higher transaction costs;
     currency fluctuations; non-deductible withholding taxes and different
     accounting and settlement practices.

     ILLIQUID SECURITIES. These securities include those that are not traded on
     the open market or that trade irregularly or in very low volume. These may
     include illiquid Rule 144A securities. They may be difficult or impossible
     to sell at the time and price the fund would like. The fund may invest up
     to 15% of its assets in illiquid securities.

     OPTIONS AND FINANCIAL FUTURES TRANSACTIONS. The fund may deal in options on
     securities, and securities indices, and financial futures transactions,
     including options on financial futures to increase or decrease its exposure
     to changing securities prices or interest rates or for bona fide hedging
     purposes. The fund may write (sell) covered call options and secured put
     options on up to 25% of its net assets and may purchase put and call
     options and purchase and sell futures contracts provided that no more than
     5% of

                                                         For More Information 11














<PAGE>

<PAGE>


     its net assets (at the time of purchase) may be invested in premiums on
     such options and initial margin deposits on such futures contracts.

     In addition, the use of options and financial futures transactions to
     achieve the fund's investment objective could result in a loss due to
     unanticipated market conditions and could increase the volatility of the
     fund. These transactions may involve a small investment of cash relative to
     the risks assumed.

     PORTFOLIO SECURITIES LENDING. The fund may lend securities to
     broker-dealers and financial institutions, as a means of earning income.
     This practice could result in a loss or delay in recovering the fund's
     securities if the borrower defaults. The fund will limit their securities
     loans to 30% of its total assets, and all loans must be fully
     collateralized with short-term liquid securities.

     REPURCHASE AGREEMENTS. The fund may enter into Repurchase Agreements. In a
     Repurchase Agreement, the fund buys a security at one price from a
     broker-dealer or financial institution and simultaneously agrees to sell
     the same security back to the same party at a higher price in the future.
     If the other party to the agreement defaults or becomes insolvent, the fund
     could lose money.

     RULE 144A SECURITIES. The fund may invest in Rule 144A securities, which
     are securities determined by the Board to be liquid pursuant to Securities
     and Exchange Commission Rule 144A (the "Rule"). Under the Rule, a
     qualifying unregistered security may be resold to a qualified institutional
     buyer without registration and without regard to whether the seller
     originally purchased the security for investment. A substantial part of the
     lower-rated debt market consisted of Rule 144A securities, many of which
     are registered within a few months of their purchases. Investments in Rule
     144A securities initially determined to be liquid could have the effect of
     diminishing the level of a fund's liquidity during periods of decreased
     market interest in such securities.

GLOSSARY OF SHADED TERMS

     ADDITIONAL CONCESSIONS. Lord Abbett Distributor may, for specified periods,
     allow dealers to retain the full sales charge for sales of shares or may
     pay an additional concession to a dealer who sells a minimum dollar amount
     of our shares and/or shares of other Lord Abbett-sponsored funds. In some
     instances, such additional concessions will be offered only to certain
     dealers expected to sell significant amounts of shares. Additional payments
     may be paid from Lord Abbett Distributor's own resources or from
     distribution fees received from a fund and will be made in the form of cash
     or, if permitted, non-cash payments. The non-cash payments will include
     business seminars at Lord Abbett's headquarters or other locations,
     including meals and entertainment, or the receipt of merchandise. The cash
     payments may include payment of various business expenses of the dealer.

     In selecting dealers to execute portfolio transactions for the fund's
     portfolio, if two or more dealers are considered capable of obtaining best
     execution, we may prefer the dealer who has sold our shares and/or shares
     of other Lord Abbett-sponsored funds.

     AUTHORIZED INSTITUTIONS. Institutions and persons permitted by law to
     receive service and/or distribution fees under a Rule 12b-1 plan are
     "Authorized Institutions." Lord Abbett Distributor is an Authorized
     Institution.

     ELIGIBLE FUND. An Eligible Fund is any Lord Abbett-sponsored fund except
     for (1) certain tax-free, single-state funds where the exchanging
     shareholder is a resident of a state in which such series is not offered
     for sale; (2) Lord Abbett Equity Fund; (3) Lord

12 For More Information














<PAGE>

<PAGE>


     Abbett Series Fund; and (4) Lord Abbett U.S. Government Securities Money
     Market Fund ("GSMMF") (except for holdings in GSMMF which are attributable
     to any shares exchanged from the Lord Abbett family of funds). An Eligible
     Fund also is any Authorized Institution's affiliated money market fund
     satisfying Lord Abbett Distributor as to certain omnibus account and other
     criteria.

     ELIGIBLE MANDATORY DISTRIBUTIONS. If class B shares represent a part of an
     individual's total IRA or 403(b) investment, the CDSC will be waived only
     for that part of a mandatory distribution which bears the same relation to
     the entire mandatory distribution as the B share investment bears to the
     total investment.

     LEGAL CAPACITY. This term refers to the authority of an individual to act
     on behalf of an entity or other person(s). For example, if a redemption
     request were to be made on behalf of the estate of a deceased shareholder,
     John W. Doe, by a person (Robert A. Doe) who has the legal capacity to act
     for the estate of the deceased shareholder because he is the executor of
     the estate, then the request must be executed as follows: Robert A. Doe,
     Executor of the Estate of John W. Doe. That signature using that capacity
     must be guaranteed by an Eligible Guarantor.

     To give another example, if a redemption request were to be made on behalf
     of the ABC Corporation by a person (Mary B. Doe) who has the legal capacity
     to act on behalf of the Corporation, because she is the president of the
     corporation, the request must be executed as follows: ABC Corporation by
     Mary B. Doe, President. That signature using that capacity must be
     guaranteed by an Eligible Guarantor (see example in right column).

     MUTUAL FUND ADVISORY PROGRAM. Certain unaffiliated authorized brokers,
     dealers, registered investment advisers or other financial institutions who
     either (1) have an arrangement with Lord Abbett Distributor in accordance
     with certain standards approved by Lord Abbett Distributor, providing
     specifically for the use of our shares (and sometimes providing for
     acceptance of orders for such shares on our behalf) in particular
     investment products made available for a fee to clients of such brokers,
     dealers, registered investment advisers and other financial institutions,
     or (2) charge an advisory, consulting or other fee for their services and
     buy shares for their own accounts or the accounts of their clients.

     PURCHASER. The term "purchaser" includes: (1) an individual, (2) an
     individual and his or her spouse and children under the age of 21 and (3) a
     trustee or other fiduciary purchasing shares for a single trust estate or
     single fiduciary account (including a pension, profit sharing, or other
     employee benefit trust qualified under Section 401 of the Internal Revenue
     Code -- more than one qualified employee benefit trust of a single
     employer, including its consolidated subsidiaries, may be considered a
     single trust, as may qualified plans of multiple employers registered in
     the name of a single bank trustee as one account), although more than one
     beneficiary is involved.

     SPECIAL RETIREMENT WRAP PROGRAM. This is a program sponsored by an
     Authorized Institution showing one or more characteristics distinguishing
     it, in the opinion of Lord Abbett Distributor from a Mutual Fund Advisory
     Program. Such characteristics include, among other things, the fact that an
     Authorized Institution does not charge its clients any fee of a consulting
     or advisory nature that is economically equivalent to the distribution fee
     under the class A 12b-1 Plan and the fact that the program relates to
     participant-directed Retirement Plans.

     GUARANTEED SIGNATURE. An acceptable form of guarantee would be as follows:

       In the case of the estate -

         Robert A. Doe
         Executor of the Estate of
         John W. Doe

       [DATE]

       SIGNATURE GUARANTEED
       MEDALLION GUARANTEED
        NAME OF GUARANTOR

                DAVID R. LEVY
- -------------------------------------
             AUTHORIZED SIGNATURE
      (960)       X 9003470
      SECURITIES TRANSFER AGENTS MEDALLION PROGRAM 'TM'
                                                    SR


       In the case of the corporation -
         ABC Corporation

         Mary B. Doe

         By Mary B. Doe, President

       [DATE]

       SIGNATURE GUARANTEED
       MEDALLION GUARANTEED
        NAME OF GUARANTOR

                DAVID R. LEVY
- -------------------------------------
             AUTHORIZED SIGNATURE
      (960)       X 9003470
      SECURITIES TRANSFER AGENTS MEDALLION PROGRAM 'TM'
                                                    SR

     YEAR 2000 ISSUES. Each fund could be adversely affected if the computers
     used by each fund and their service providers do not properly process and
     calculate date-related information from and after January 1, 2000.

     Lord Abbett is working to avoid such problems and has received assurances
     from each fund's service providers that they are taking similar steps. Of
     course, the Year 2000 problem is unprecedented and, therefore, Lord Abbett
     cannot eliminate altogether the possibility that it or the fund will be
     affected.

                                                         For More Information 13














<PAGE>

<PAGE>


                             Financial Information

COMPENSATION FOR YOUR DEALER

<TABLE>
<CAPTION>
==================================================================================================================================
                            FIRST YEAR COMPENSATION

                                  Front-end
                                  sales charge              Dealer's
                                  paid by investors         concession              Service fee(1)         Total compensation(2)
Class A investments               (% of offering price)     (% of offering price)   (% of net investment)  (% of offering price)
==================================================================================================================================
<S>                                      <C>                       <C>                      <C>                    <C>  
Less than $50,000                        4.75%                     4.00%                    0.25%                  4.24%
- ----------------------------------------------------------------------------------------------------------------------------------
$50,000 - $99,999                        4.75%                     4.25%                    0.25%                  4.49%
- ----------------------------------------------------------------------------------------------------------------------------------
$100,000 - $249,999                      3.75%                     3.25%                    0.25%                  3.49%
- ----------------------------------------------------------------------------------------------------------------------------------
$250,000 - $499,999                      2.75%                     2.50%                    0.25%                  2.74%
- ----------------------------------------------------------------------------------------------------------------------------------
$500,000 - $999,999                      2.00%                     1.75%                    0.25%                  2.00%
- ----------------------------------------------------------------------------------------------------------------------------------
$1 million or more(3) or Retirement Plan - 100 or more
eligible employees(3) or Special Retirement Wrap Program(3)
- ----------------------------------------------------------------------------------------------------------------------------------
First $5 million               no front-end sales charge           1.00%                    0.25%                  1.25%
- ----------------------------------------------------------------------------------------------------------------------------------
Next $5 million above that     no front-end sales charge           0.55%                    0.25%                  0.80%
- ----------------------------------------------------------------------------------------------------------------------------------
Next $40 million above that    no front-end sales charge           0.50%                    0.25%                  0.75%
- ----------------------------------------------------------------------------------------------------------------------------------
Over $50 million               no front-end sales charge           0.25%                    0.25%                  0.50%
- ----------------------------------------------------------------------------------------------------------------------------------
Class B investments                                                 Paid at time of sale (% of net asset value)
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           3.75%                    0.25%                  4.00%
- ----------------------------------------------------------------------------------------------------------------------------------
Class C investments                                                                                               
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           0.75%                    0.25%                  1.00%
- ----------------------------------------------------------------------------------------------------------------------------------
Class P investments                                                 Percentage of average net assets                              
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           0.25%                    0.20%                  0.45%
- ----------------------------------------------------------------------------------------------------------------------------------

===================================================================================================================================
                                       ANNUAL COMPENSATION AFTER FIRST YEAR                                                      
Class A investments                                                                                               
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           none                     0.25%                  0.25%
- ----------------------------------------------------------------------------------------------------------------------------------
Class B investments                                                 Percentage of average net assets(4)                           
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           none                     0.25%                  0.25%
- ----------------------------------------------------------------------------------------------------------------------------------
Class C investments                                                                                               
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           0.65%                    0.25%                  0.90%
- ----------------------------------------------------------------------------------------------------------------------------------
Class P investments                                                 Percentage of average net assets                               
- ----------------------------------------------------------------------------------------------------------------------------------
All amounts                    no front-end sales charge           0.25%                    0.20%                  0.45%
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) The service fee for class A and P shares is paid quarterly. The first year's
    service fee on class B and C shares is paid at the time of sale.

(2) Dealer's concession percentages and service fee percentages are calculated
    from different amounts, and therefore may not equal total compensation
    percentages if combined using simple addition. Additional Concessions may be
    paid to Authorized Institutions from time to time.

(3) With respect to class B, C and P shares, 0.25%, 0.90% and 0.45%,
    respectively of the average annual net asset value of such shares
    outstanding during the quarter (including distribution reinvestment shares
    after the first anniversary of their issuance) is paid to Authorized
    Institutions. This fee is paid quarterly in arrears. In the case of class C
    shares for fixed-income funds, such as High Yield Fund, 0.10% of the average
    annual net asset value of such shares is retained by Lord Abbett
    Distributor, thus reducing the dealer's concession from 0.75% to 0.65% after
    the first year. Lord Abbett Distributor uses this 0.10% for expenses
    primarily intended to result in the sale of such fund's shares.

14 Financial Information














<PAGE>

<PAGE>










                       THIS PAGE INTENTIONALLY LEFT BLANK





















<PAGE>

<PAGE>








                       THIS PAGE INTENTIONALLY LEFT BLANK






















<PAGE>

<PAGE>


     More information on this fund is available free upon request, including the
     following:

ANNUAL/SEMI-ANNUAL REPORT

     Describes the fund, lists portfolio holdings and contains a letter from the
     fund's manager discussing recent market conditions and the fund's
     investment strategies.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

     Provides more details about the fund and its policies. A current SAI is on
     file with the Securities and Exchange Commission ("SEC") and is
     incorporated by reference (is legally considered part of this prospectus).


     LORD ABBETT HIGH YIELD FUND

     The General Motors Building
     767 Fifth Avenue
     New York, NY 10153-0203
     ---------------------------
     SEC file number: 811-7988

     To obtain information:

     BY TELEPHONE. Call the fund at:
     800-426-1130

     BY MAIL. Write to the fund at:
     The Lord Abbett Family of Funds
     767 Fifth Avenue
     New York, NY 10153-0203

     VIA THE INTERNET.
     LORD, ABBETT & CO.
     http://www.lordabbett.com

     Text only versions of fund documents can be viewed online or downloaded
     from:
     SEC
     http://www.sec.gov

     You can also obtain copies by visiting the SEC's Public Reference Room in
     Washington, DC (phone 800-SEC-0330) or by sending your request and a
     duplicating fee to the SEC's Public Reference Section, Washington, DC
     20549-6009.

     LAHYF-1-499
     (4/99)




<PAGE>

<PAGE>

LORD                           Limited Duration U.S.             
ABBETT                            Government Securities Series   
INVESTMENT TRUST               U.S. Government Securities Series 
                               


PROSPECTUS
APRIL 1, 1999





LORD ABBETT & CO [LOGO]




     As with all mutual funds, the Securities and Exchange Commission does not
     guarantee that the information in this prospectus is accurate or complete,
     and it has not judged these funds for investment merit. It is a criminal
     offense to state otherwise.

     Class P shares of each fund are neither offered to the general public nor
     available in all states. Please call 800-821-5129 for further information.






<PAGE>

<PAGE>






                               Table of Contents

<TABLE>
<CAPTION>
                                                                         PAGE
                              The Funds
<S>                                   <C>  
      Information about the goal/     Limited Duration U.S.                  
       approach, main risks, past        Government Securities Fund        2 
   performance, fees and expenses     U.S. Government Securities Fund      4 
                                      
                           Your Investment

         Information for managing     Purchases                            6  
                your fund account     Opening Your Account                 8  
                                      Redemptions                          9  
                                      Distributions and Taxes              9  
                                      Services For Fund Investors         10  
                                      Sales Charges and Service Fees      11  
                                      Management                          12  
                                      
                         For More Information

                How to learn more     Other Investment Techniques         13 
                  about the funds     Glossary of Shaded Terms            14 
                                      Recent Performance                  15 
                                      
                        Financial Information

             Financial highlights     Limited Duration U.S.                  
                     of each fund        Government Securities Fund       16 
                                      U.S. Government Securities Fund     18 
                                      Compensation For Your Dealer        20 
                                      
     How to learn more about the      Back Cover
fund and other Lord Abbett funds

</TABLE>






<PAGE>

<PAGE>



                Limited Duration U.S. Government Securities Fund

                                   The Funds


GOAL / APPROACH

     The fund's investment objective is to seek a high level of income from a
     portfolio consisting primarily of limited duration U.S. Government
     securities.

     To pursue its goal, the fund primarily invests in short- and intermediate-
     duration U.S. Government securities which the fund expects will produce a
     high level of income. Investments of the fund include direct obligations of
     the U.S. Treasury (such as Treasury bills, notes and bonds) and certain
     obligations issued by U.S. Government agencies and its instrumentalities.
     These obligations issued by U.S. Government agencies include:

       Federal Home Loan Banks

       Federal Home Loan Mortgage Corporation ("FHLMC's")

       Federal National Mortgage Association ("FNMA's")

       Government National Mortgage Association ("GNMA's")

       Mortgage-backed securities issued or guaranteed by the U.S. Government,
       its agencies or instrumentalities, including "component securities"


MAIN RISKS

       The U.S. Government securities in which the fund invests are guaranteed
       as to timely payments of interest and principal. However, the market
       price for these securities are not guaranteed and will fluctuate. Such
       securities will not protect investors against price changes due to
       changing interest rates. The fund does not seek to maintain a stable net
       asset value, and may not be able to return dollar-for-dollar the money
       invested. The value of shares of the fund will change as the general
       levels of interest rates fluctuate. When interest rates decline, share
       value generally rises. Conversely, when rates rise, share value generally
       declines. The fund may employ other investment practices, such as
       investing in illiquid and other securities, which could adversely affect
       performance.

       An investment in the fund is not a bank deposit. It is not FDIC-insured
       or government endorsed. It is not a complete investment program. You
       could lose money in the fund, but you also have the potential to make
       money.

       WE OR THE FUND refers to Limited Duration U.S. Government Securities
       Series ("Limited Duration U.S. Government Fund"), a series of Lord Abbett
       Investment Trust (the "company"). The fund operates under the supervision
       of the company's Board, with the advice of Lord, Abbett & Co. ("Lord
       Abbett"), its investment manager.

       ABOUT THE FUND. The fund is a professionally managed portfolio primarily
       holding securities purchased with the pooled money of investors. It
       strives to reach its stated goal, although as with all funds, it cannot
       guarantee results.

       MORTGAGE-BACKED SECURITIES directly or indirectly represent a
       participation in, or are secured by and payable from, mortgage loans
       secured by real property. The price of mortgage-backed securities may be
       significantly affected by changes in interest rates. Some mortgage-backed
       securities have structures that make their reaction to interest rates and
       other factors difficult to predict, making their prices very volatile.

2 The Funds





<PAGE>

<PAGE>



Limited Duration U.S. Gov't Securities Fund             Symbols: Class A - LALDX
                                                                 Class C - LDLAX

PAST PERFORMANCE

       The information below provides some indication of the risks of investing
       in the fund by showing changes in the fund's class A shares' performance
       from calendar year to calendar year and by showing how the fund's average
       annual returns compare with those of a broad measure of market
       performance.


[PERFORMANCE GRAPH]

"94"   -3.5%
"95"   10.1%
"96"    1.3%
"97"    6.9%
"98"    6.6%
Best Quarter: 20.03% Worst Quarter: -7.20% 

The table below shows a comparison of the fund's class A and C average annual
total return to that of the Lipper's Short U.S. Government Fund Index, Lipper's
Intermediate U.S. Government Fund Index, and the Lehman Intermediate Government
Bond Index. Fund returns assume reinvestment of dividends and distributions and
payment of the maximum applicable front-end or deferred sales charge. All
periods end on December 31, 1998.

<TABLE>
<CAPTION>
CLASS                 1 YEAR         5 YEARS       INCEPTION(i)      LSUSGFI(ii)     LIUSGFI(ii)   LIGBI(ii)
<S>                   <C>             <C>             <C>               <C>             <C>          <C>  
A                     3.30%           3.54%           3.48%             5.62%           6.11%        6.43%
- ------------------------------------------------------------------------------------------------------------
C                     4.20%            --             5.91%             6.68%           8.65%        8.29%
- ------------------------------------------------------------------------------------------------------------
LSUSGF Index(ii)      6.56%           5.63%            --                --              --            --
- ------------------------------------------------------------------------------------------------------------
LIUSGF Index(ii)      8.17%           6.12%            --                --              --            --
- ------------------------------------------------------------------------------------------------------------
LIGB Index(ii)        8.49%           6.45%            --                --              --            --
- ------------------------------------------------------------------------------------------------------------
</TABLE>


FEES AND EXPENSES

     This table describes the fees and expenses that you may pay if you buy and
hold shares of the fund.

<TABLE>
<CAPTION>
=====================================================================================
Fee Table
- -------------------------------------------------------------------------------------
                                                           CLASS A   CLASS C  CLASS P
<S>                                                         <C>        <C>      <C>
SHAREHOLDER FEES (Fees paid directly from your investment)
- -------------------------------------------------------------------------------------
Maximum Sales Charge on Purchases
- -------------------------------------------------------------------------------------
(as a % of offering price)                                  3.00%      none     none
- -------------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")             none       1.00%    none
- -------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES (Expenses deducted           
from fund assets) (as a % of average net assets)(1)         
- -------------------------------------------------------------------------------------
Management Fees (See "Management")                          0.50%      0.50%    0.50%
- -------------------------------------------------------------------------------------
Distribution and Service (12b-1) Fees(2)                    0.00%      1.00%    0.45%
- -------------------------------------------------------------------------------------
Other Expenses (See "Management")                           0.88%      0.88%    0.88%
- -------------------------------------------------------------------------------------
Total Operating Expenses                                    1.38%      2.38%    1.83%
- -------------------------------------------------------------------------------------

=====================================================================================
Expense example
- -------------------------------------------------------------------------------------
This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment at maximum sales charge, if any, 5% total return each year and no
changes in expenses. You pay the following expenses over the course of each
period shown if you sell your shares at the end of the period, although your
actual cost may be higher or lower. The expenses include any applicable
contingent deferred sales charges.


<CAPTION>

SHARE CLASS          1 YEAR      3 YEARS    5 YEARS      10 YEARS
<S>                   <C>          <C>       <C>          <C>   
Class A shares        $436         $724      $1,032       $1,910
- -----------------------------------------------------------------
Class C shares        $341         $742      $1,270       $2,718
- -----------------------------------------------------------------
Class P shares        $186         $575      $  990       $2,150
- -----------------------------------------------------------------

You would pay the following expenses on the same investment, assuming you kept
your shares.

Class A shares        $436         $724      $1,032       $1,910
- -----------------------------------------------------------------
Class C shares        $241         $742      $1,270       $2,718
- -----------------------------------------------------------------
Class P shares        $186         $575      $  990       $2,150
- -----------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.

     Past performance is not a prediction of future results.

- --------------------------------------------------------------------------------
     (i)   The date of inception for each class are as follows: A -11/4/93; and
           C -7/15/96.

     (ii)  Performance for the unmanaged Lipper's Short U.S. Government Fund
           Index, Lipper's Intermediate U.S. Government Fund Index, and the
           Lehman Intermediate Government Bond Index does not reflect
           transaction costs or management fees.

     (iii) Represents total returns for the period 11/30/93 to 12/31/98, to
           correspond with class A inception date.

     (iv)  Represents total returns for the period 7/31/96 to 12/31/98, to
           correspond with class C inception date.

     MANAGEMENT FEES are payable to Lord Abbett for the fund's investment
     management.

     12b-1 FEES refer to fees incurred for activities that are primarily
     intended to result in the sale of fund shares and service fees for
     shareholder account service and maintenance.

     THE 12b-1 PLAN FOR THE FUND WILL NOT BECOME OPERATIVE FOR CLASS A SHARES
     UNTIL THE CLASS A NET ASSETS REACH $100 MILLION.

     OTHER EXPENSES include fees paid for miscellaneous items such as transfer
     agency, legal and share registration fees.

     LORD ABBETT IS CURRENTLY WAIVING THE MANAGEMENT FEE AND SUBSIDIZING A
     PORTION OF THE OTHER EXPENSES OF THE FUND. LORD ABBETT MAY STOP WAIVING THE
     MANAGEMENT FEE AND SUBSIDIZING A PORTION OF THE OTHER EXPENSES AT ANY TIME.
     TOTAL OPERATING EXPENSES WITH THE FEE WAIVER AND EXPENSE SUBSIDY ARE 0.47%,
     1.47% AND 0.92% FOR CLASS A, C, AND P SHARES, RESPECTIVELY.

     ---------------------------------------------------------------------------

     (1) The annual operating expenses have been restated from fiscal year
         amounts to reflect current fees.

     (2) Because 12b-1 distribution fees are paid out on an ongoing basis, over
         time these fees will increase the cost of your investment and may cost
         you more than paying other types of sales charges.

                                                                     The Funds 3





<PAGE>

<PAGE>



                                                 U.S. Government Securities Fund

GOAL / APPROACH

     The fund's investment objective is high current income consistent with
     reasonable risk.

     To pursue its goal, the fund invests in obligations issued by the U.S.
     Treasury and certain obligations issued or guaranteed by U.S. Government
     agencies or its instrumentalities. These obligations issued by U.S.
     Government agencies include:

       Federal Home Loan Banks

       Federal Home Loan Mortgage Corporation ("FHLMC's")

       Federal National Mortgage Association ("FNMA's")

       Federal Farm Credit Bank

       Government National Mortgage Association ("GNMA's")

       Student Loan Marketing Association

       Tennessee Valley Authority

     Such investments provide substantial protection against credit risks. Some
     of these securities are guaranteed as to timely payment of principal and
     interest.

MAIN RISKS

     The market price for U.S. Government securities is not guaranteed and will
     fluctuate. Such securities will not protect investors against price changes
     due to changing interest rates. The value of fund shares will change as the
     general levels of interest rates fluctuate. When interest rates decline,
     share value rises. When interest rates rise, share value can be expected to
     decline. The fund may employ other investment practices, such as investment
     in illiquid and other securities, that could adversely affect performance.

     An investment in the fund is not a bank deposit. It is not FDIC-insured or
     government endorsed. It is not a complete investment program. You could
     lose money in the fund, but you also have the potential to make money.

     WE OR THE FUND refers to U.S. Government Securities Series ("U.S.
     Government Fund"), a series of Lord Abbett Investment Trust (the "company")
     the company operates under the supervision of the company's Board, with the
     advice of Lord, Abbett & Co. ("Lord Abbett"), its investment manager.

     ABOUT THE FUND. The fund is a professionally managed portfolio primarily
     holding securities purchased with the pooled money of investors. It strives
     to reach its stated goal, although as with all funds, it cannot guarantee
     results.

     REASONABLE RISK is the volatility the fund will have over time which we
     believe will approximate the Lehman Brothers Government Bond Index.

4 The Funds





<PAGE>

<PAGE>



U.S. Government Securities Fund                         Symbols: Class A - LAGVX
                                                                 Class B - LAVBX
                                                                 Class C - LAUSX

PAST PERFORMANCE

     The information below provides some indication of the risks of investing in
     the fund by showing changes in the fund's class A shares' performance from
     calendar year to calendar year and by showing how the fund's average annual
     returns compare with those of a broad measure of market performance.

[PERFORMANCE GRAPH]

"89"   12.7%
"90"    9.3%
"91"   16.9%
"92"    7.1%
"93"    9.2%
"94"   -4.3%
"95"   15.7%
"96"    1.6%
"97"    9.2%
"98"    7.9%
Best Qarter: 18.56% Worst Quarter: -12.78%

The table below shows a comparison of the fund's class A, B and C average annual
total return to that of the Lipper's General U.S. Government Bond Fund Index,
and the Lehman Government Bond Index which has no sales charges. Fund returns
assume reinvestment of dividends and distributions and payment of the maximum
applicable front-end or deferred sales charge. All periods end on December 31,
1998.

<TABLE>
<CAPTION>
CLASS                                             1 YEAR      INCEPTION(i)
<S>                                                <C>           <C>   
A                                                  2.70%         10.24%
- --------------------------------------------------------------------------
B                                                  3.23%         6.78%
- --------------------------------------------------------------------------
C                                                  7.10%         8.39%
- --------------------------------------------------------------------------
Lipper's General U.S. Gov't Bond Fund Index
Lehman Gov't Bond Index(ii)                        0.00%         0.00%
- --------------------------------------------------------------------------
</TABLE>


FEES AND EXPENSES

     This table describes the fees and expenses that you may pay if you buy and
hold shares of the fund.

<TABLE>
<CAPTION>
=====================================================================================================
Fee Table
- -----------------------------------------------------------------------------------------------------
                                                             CLASS A    CLASS B    CLASS C    CLASS P
                                                                                            
<S>                                                           <C>        <C>        <C>        <C>
SHAREHOLDER FEES (Fees paid directly from your investment)                                  
- -----------------------------------------------------------------------------------------------------
Maximum Sales Charge on Purchases                                                           
- -----------------------------------------------------------------------------------------------------
(as a % of offering price)                                    4.75%      none       none       none
- -----------------------------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")               none       5.00%(1)   1.00%      none
- -----------------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES (Expenses deducted                                           
from fund assets) (as a % of average net assets)(2)                                         
- -----------------------------------------------------------------------------------------------------
Management Fees (See "Management")                            0.50%      0.50%      0.50%      0.50%
- -----------------------------------------------------------------------------------------------------
Distribution and Service (12b-1) Fees(3)                      0.35%      1.00%      1.00%      0.45%
- -----------------------------------------------------------------------------------------------------
Other Expenses (See "Management")                             0.18%      0.18%      0.18%      0.18%
- -----------------------------------------------------------------------------------------------------
Total Operating Expenses                                      1.03%      1.68%      1.68%      1.13%
- -----------------------------------------------------------------------------------------------------

=====================================================================================================
Expense Example
- -----------------------------------------------------------------------------------------------------
This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment at maximum sales charge, if any, 5% total return each year and no
changes in expenses. You pay the following expenses over the course of each
period shown if you sell your shares at the end of the period, although your
actual cost may be higher or lower. The expenses include any applicable
contingent deferred sales charges.

<CAPTION>
SHARE CLASS          1 YEAR  3 YEARS   5 YEARS  10 YEARS
<S>                   <C>      <C>      <C>      <C>   
Class A shares        $575     $787     $1,017   $1,677
- -------------------------------------------------------
Class B shares(3)     $671     $829     $1,112   $1,816
- -------------------------------------------------------
Class C shares        $271     $529     $  912   $1,989
- -------------------------------------------------------
Class P shares        $115     $359     $  622   $1,377
- -------------------------------------------------------

You would pay the following expenses on the same investment, assuming you kept
your shares.

Class A shares        $575     $787     $1,017   $1,677
- -------------------------------------------------------
Class B shares(3)     $171     $529     $  912   $1,816
- -------------------------------------------------------
Class C shares        $171     $529     $  912   $1,989
- -------------------------------------------------------
Class P shares        $115     $359     $  622   $1,377
- -------------------------------------------------------
</TABLE>

     This example is for comparison and is not a representation of the fund's
     actual expenses or returns, either past or present.

     Past performance is not a prediction of future results.

     ---------------------------------------------------------------------------
     (i) The date of inception for each class are as follows: A -1/1/82; B
         -8/1/96; and C -7/15/96.

    (ii) Performance for the unmanaged Lipper's General U.S. Government Bond
         Fund Index and the Lehman Government Bond Index do not reflect
         transaction costs or management fees.


     MANAGEMENT FEE are payable to Lord Abbett for the fund's investment
     management.

     12b-1 FEES refer to fees incurred for activities that are primarily
     intended to result in the sale of fund shares and service fees for
     shareholder account service and maintenance.

     OTHER EXPENSES include fees paid for miscellaneous items such as transfer
     agency, legal and share registration fees.

     ---------------------------------------------------------------------------
     (1) Class B shares will automatically convert to class A shares on the
         eighth anniversary of your original purchase of class B shares.

     (2) The annual operating expenses have been restated from fiscal year
         amounts to reflect current fees.

     (3) Because 12b-1 distribution fees are paid out on an ongoing basis, over
         time they will increase the cost of your investment and may cost you
         more than paying other types of sales charges.

                                                                     The Funds 5





<PAGE>

<PAGE>



                                Your Investment

PURCHASES

     This prospectus offers three classes of shares, classes A, C and P for the
     Limited Duration U.S. Government Securities Fund, and four classes of
     shares, classes A, B, C and P for the U.S. Government Securities Fund (call
     800-821-5129 to find out if P shares are available in your state). Although
     a fund may have more than one class of shares, these different classes
     represent investments in the same portfolio of securities but are subject
     to different expenses. Our shares are continuously offered. The offering
     price is based on the Net Asset Value ("NAV") per share next determined
     after we receive your purchase order submitted in proper form. A front-end
     sales charge is added to the NAV in the case of the class A shares. There
     is no front-end sales charge although there is a Contingent Deferred Sales
     Charge in the case of the class B and C shares, as described below.

     You should read this section carefully to determine which class of shares
     represents the best investment option for your particular situation. It may
     not be suitable for you to place a purchase order for class B shares of
     $500,000 or more, or a purchase order for class C shares of $1,000,000 or
     more. You should discuss pricing options with your investment professional.

     For more information, see "Alternative Sales Arrangements" in the Statement
     of Additional Information.

     We reserve the right to withdraw all or any part of the offering made by
     this prospectus or to reject any purchase order. We also reserve the right
     to waive or change minimum investment requirements. All purchase orders are
     subject to our acceptance and are not binding until confirmed or accepted
     in writing.

<TABLE>
=========================================================================================
FRONT-END SALES CHARGES - CLASS A SHARES
(Limited Duration U.S. Government Fund only)
- -----------------------------------------------------------------------------------------
<CAPTION>
                               AS A % OF             AS A % OF        TO COMPUTE OFFERING
YOUR INVESTMENT              OFFERING PRICE       YOUR INVESTMENT     PRICE DIVIDE NAV BY
<S>       <C>                    <C>                   <C>                  <C>  
- -----------------------------------------------------------------------------------------
Less than $100,000               3.00%                 3.09%                .9700
- -----------------------------------------------------------------------------------------
$100,000 to $249,999             2.50%                 2.56%                .9750
- -----------------------------------------------------------------------------------------
$250,000 to $499,999             2.00%                 2.04%                .9800
- -----------------------------------------------------------------------------------------
$500,000 to $999,999             1.50%                 1.52%                .9850
- -----------------------------------------------------------------------------------------
$1,000,000 to $2,999,999         1.00%                 1.01%                .9900
- -----------------------------------------------------------------------------------------
$3,000,000 to $9,999,999         0.50%                 0.50%                .9950
- -----------------------------------------------------------------------------------------
$10,000,000 or more              0.25%                 0.25%                .9975
- -----------------------------------------------------------------------------------------

=========================================================================================
FRONT-END SALES CHARGES - CLASS A SHARES
(U.S. Government Securities Fund Only)
- -----------------------------------------------------------------------------------------
<CAPTION>
                               AS A % OF             AS A % OF        TO COMPUTE OFFERING
YOUR INVESTMENT              OFFERING PRICE       YOUR INVESTMENT     PRICE DIVIDE NAV BY
<S>       <C>                    <C>                   <C>                  <C>  
- -----------------------------------------------------------------------------------------
Less than $50,000                4.75%                 4.99%                .9525
- -----------------------------------------------------------------------------------------
$50,000 to $99,999               4.75%                 4.99%                .9525
- -----------------------------------------------------------------------------------------
$100,000 to $249,999             3.75%                 3.90%                .9625
- -----------------------------------------------------------------------------------------
$250,000 to $499,999             2.75%                 2.83%                .9725
- -----------------------------------------------------------------------------------------
$500,000 to $999,999             2.00%                 2.04%                .9800
- -----------------------------------------------------------------------------------------
$1,000,000 and over              No Sales Charge                            .9900
- -----------------------------------------------------------------------------------------
</TABLE>

     NAV per share for each class of fund shares is calculated each business day
     at the close of regular trading on the New York Stock Exchange ("NYSE").
     Each fund is open on those business days when the NYSE is open. Purchases
     and sales of fund shares are executed at the NAV next determined after the
     fund receives your order. In calculating NAV, securities for which market
     quotations are available are valued at those quotations. Securities for
     which such quotations are not available are valued at fair value under
     procedures approved by the Board.

     Share classes

     CLASS A

       normally offered with a front-end sales charge

     CLASS B

       no front-end sales charge, however, a contingent deferred sales charge
       is applied to shares sold prior to the sixth anniversary of purchase

       higher annual expenses than class A shares

       automatically convert to class A shares after eight years

     CLASS C

       no front-end sales charge

       higher annual expenses than class A shares

       a contingent deferred sales charge is applied to shares sold prior to the
       first anniversary of purchase

     CLASS P

       available to certain pension or retirement plans and pursuant to a Mutual
       Fund Advisory Program

6 Your Investment





<PAGE>

<PAGE>



     REDUCING YOUR CLASS A FRONT-END SALES CHARGES. Class A shares may be
     purchased at a discount if you qualify under either of the following
     conditions:

       RIGHTS OF ACCUMULATION -- A Purchaser can apply the value (at public
       offering price) of the shares you already own to a new purchase of class
       A shares of any Eligible Fund in order to reduce the sales charge.

       STATEMENT OF INTENTION -- A Purchaser of class A shares can purchase
       additional shares of any Eligible Fund over a 13-month period and receive
       the same sales charge as if all shares were purchased at once. Shares
       purchased through reinvestment of dividends and distributions are not
       included. A statement of intention can be backdated 90 days. Current
       holding under rights of accumulation can be included in a statement of
       intention.

     For more information on eligibility for these privileges, read the
     applicable sections in the attached application.

     CLASS A SHARE PURCHASES WITHOUT A FRONT-END SALES CHARGE. Class A shares
     may be purchased without a front-end sales charge under any of the
     following conditions:

       purchases of $1 million or more *

       purchases by Retirement Plans with at least 100 eligible employees *

       purchases under a Special Retirement Wrap Program *

       purchases made with dividends and distributions on class A shares of
       another Eligible Fund

       purchases representing repayment under the loan feature of the Lord
       Abbett-sponsored prototype 403(b) Plan for class A shares

       purchases by employees of any consenting securities dealer having a sales
       agreement with Lord Abbett Distributor

       purchases under a Mutual Fund Advisory Program

       purchases by trustees or custodians of any pension or profit sharing
       plan, or payroll deduction IRA for employees of any consenting securities
       dealer having a sales agreement with Lord Abbett Distributor

     See the Statement of Additional Information for a listing of other
     categories of purchasers who qualify for class A share purchases without a
     front-end sales charge.

     * These categories may be subject to a Contingent Deferred Sales Charge
       ("CDSC").

     CLASS A SHARE CDSC. If you buy class A shares under one of the starred (*)
     categories listed above and you redeem any of them within 24 months after
     the month in which you initially purchased them, the fund normally will
     collect a CDSC of 1%.

     The class A share CDSC generally will be waived for the following
     conditions:

       benefit payments such as Retirement Plan loans, hardship withdrawals,
       death, disability, retirement, separation from service or any excess
       distribution under Retirement Plans (documentation may be required)

       redemptions continuing as investments in another fund participating in a
       Special Retirement Wrap Program

     CLASS B SHARE CDSC (U.S. GOVERNMENT SECURITIES FUND ONLY). The CDSC for
     class B shares normally applies if you redeem your shares before the sixth
     anniversary of their initial purchase. The CDSC declines the longer you own
     your shares, according to the following schedule:

     CDSC, regardless of class, is not charged on shares acquired through
     reinvestment of dividends or capital gains distributions and is charged on
     the original purchase cost or the current market value of the shares at the
     time they are being sold, whichever is lower. In addition, repayment of
     loans under Retirement Plans and 403(b) Plans will constitute new sales for
     purposes of assessing the CDSC.

     To minimize the amount of any CDSC, the fund redeems shares in the
     following order:

     1. shares acquired by reinvestment of dividends and capital gains (always
        free of a CDSC)

     2. shares held for six years or more (class B) or two years or more after
        the month of purchase (class A) or one year or more (class C)

     3. shares held the longest before the sixth anniversary of their purchase
        (class B) or before the second anniversary after the month of purchase
        (class A) or before the first anniversary of their purchase (class C)

     RETIREMENT PLANS include employer-sponsored retirement plans under the
     Internal Revenue Code, excluding Individual Retirement Accounts.

     LORD ABBETT DISTRIBUTOR LLC ("Lord Abbett Distributor") acts as agent for
     the funds to work with investment professionals that buy and/or sell shares
     of the funds on behalf of their clients. Generally, Lord Abbett Distributor
     does not sell fund shares directly to investors.

     BENEFIT PAYMENT DOCUMENTATION. (class A only)

       under $50,000 - no documentation necessary

       over $50,000 - reason for benefit payment must be received in writing.
       Use  the address indicated under "Opening Your Account."

                                                               Your Investment 7





<PAGE>

<PAGE>


================================================================================
CONTINGENT DEFERRED SALES CHARGES - CLASS B SHARES
(U.S. Government Securities Fund only)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
ANNIVERSARY(1) OF                            CONTINGENT DEFERRED SALES CHARGE
THE DAY ON WHICH THE                         ON REDEMPTIONS (AS A % OF AMOUNT
PURCHASE ORDER WAS ACCEPTED                  SUBJECT TO CHARGE)

On                               Before
- --------------------------------------------------------------------------------
<S>                              <C>                       <C> 
                                 1st                       5.0%
- --------------------------------------------------------------------------------
1st                              2nd                       4.0%
- --------------------------------------------------------------------------------
2nd                              3rd                       3.0%
- --------------------------------------------------------------------------------
3rd                              4th                       3.0%
- --------------------------------------------------------------------------------
4th                              5th                       2.0%
- --------------------------------------------------------------------------------
5th                              6th                       1.0%
- --------------------------------------------------------------------------------
on or after the 6th(2)                                     None
- --------------------------------------------------------------------------------
</TABLE>

(1) The anniversary is the same calendar day in each respective year after the
    date of purchase. For example, the anniversaries for shares purchased on
    May 1 will be May 1 of each succeeding year.

(2) Class B shares will automatically convert to class A shares on the eighth
    anniversary of the purchase of class B shares.

     The class B share CDSC generally will be waived under any one of the
     following conditions:

       benefit payments such as Retirement Plan loans, hardship withdrawals,
       death, disability, retirement, separation from service or any excess
       contribution or distribution under Retirement Plans

       Eligible Mandatory Distributions under 403(b) Plans and individual
       retirement accounts

       death of the shareholder (natural person)

       redemptions of shares in connection with Div-Move and Systematic
       Withdrawal Plans (up to 12% per year)

     See "Systematic Withdrawal Plan" under "Services For Fund Investors --
     Automatic Services" below for more information on CDSCs with respect to
     class B shares.

     CLASS C SHARE CDSC. The 1% CDSC for class C shares normally applies if you
     redeem your shares before the anniversary of the purchase of the shares.

     CLASS P SHARES. Class P shares have lower annual expenses than class B and
     class C shares, no front-end sales charge, and no CDSC. Class P shares are
     currently sold and redeemed at NAV (a) pursuant to a Mutual Fund Advisory
     Program, or (b) to the trustees of, or employer-sponsors with respect to,
     pension or retirement plans with at least 100 eligible employees (such as a
     plan under Section 401(a), 401(k) or 457(b) of the Internal Revenue Code)
     which engage an investment professional providing or participating in an
     agreement to provide certain recordkeeping, administrative and/or
     sub-transfer agency services to the fund on behalf of the class P
     shareholders.

OPENING YOUR ACCOUNT

     MINIMUM INITIAL INVESTMENT

<TABLE>
<S>                                                                          <C>   
       Regular account (Limited Duration U.S. Government Securities Fund)    $1,000
       (U.S. Government Securities Fund)                                       $500

       Individual Retirement Accounts and
       403(b) Plans under the Internal Revenue Code                            $250

       Uniform Gifts to Minors Account                                         $250
</TABLE>

     IMPORTANT INFORMATION. You may be subject to a $50 penalty under the
     Internal Revenue Code if you do not provide a correct taxpayer
     identification number (Social Security Number for individuals) or make
     certain required certifications. In addition, we may be required to
     withhold from your account and pay to the U.S. Treasury 31% of any
     redemption proceeds and of any dividend or distribution from your account.

8 Your Investment





<PAGE>

<PAGE>



     For Retirement Plans and Mutual Fund Advisory Programs, no minimum
     investment is required, regardless of share class.

     You may purchase shares through any independent securities dealer who has a
     sales agreement with Lord Abbett Distributor or you can fill out the
     attached application and send it to the fund you select at the address
     stated below. You should carefully read the paragraph below entitled
     "Proper Form" before placing your order to assure your order will be
     accepted.

     NAME OF FUND
     P.O. Box 419100
     Kansas City, MO 64141

     PROPER FORM. An order submitted directly to the fund must contain: (1) a
     completed application, and (2) payment by check. For more information
     regarding proper form of a purchase order, call the fund at 800-821-5129.
     Payment must be credited in U.S. dollars to our custodian bank's account.

     BY EXCHANGE. Telephone the fund at 800-821-5129 to request an exchange from
     any eligible Lord Abbett-sponsored fund.

REDEMPTIONS

     BY BROKER. Call your investment professional for directions on how to
     redeem your shares.

     BY TELEPHONE. To obtain the proceeds of a redemption of $50,000 or less
     from your account, you or your representative can call the fund at
     800-821-5129.

     BY MAIL. Submit a written redemption request indicating the name(s) in
     which the account is registered, the fund's name, the class of shares, your
     account number, and the dollar value or number of shares you wish to sell.

     Include all necessary signatures. If the signer has any Legal Capacity, the
     signature and capacity must be guaranteed by an Eligible Guarantor. Certain
     other legal documentation may be required. For more information regarding
     proper documentation call 800-821-5129.

     Normally a check will be mailed to the name and address in which the
     account is registered (or otherwise according to your instruction) within
     three business days after receipt of your redemption request. Your account
     balance must be sufficient to cover the amount being redeemed or your
     redemption order will not be processed. Redemption requests for shares
     initially purchased by check will not be honored for up to 15 days, unless
     we are assured that the check has cleared earlier.

     To determine if a CDSC applies to a redemption, see "Class A Share CDSC,"
     "Class B Share CDSC" or "Class C Share CDSC."

DISTRIBUTIONS AND TAXES

     Each fund pays its shareholders dividends from its net investment income,
     and distributes net capital gains that it has realized. Each fund expects
     to pay such income dividends to shareholders monthly. If a capital gain
     distribution is declared, it is expected to be paid annually. Your
     distributions will be reinvested in your fund unless you instruct the fund
     to pay them to you in cash. There are no sales charges on reinvestments.

     SMALL ACCOUNTS. Our Board may authorize closing any account in which there
     are fewer than 25 shares if it is in a fund's best interest to do so.

     ELIGIBLE GUARANTOR is any broker or bank that is a member of the Medallion
     Stamp Program. Most major securities firms and banks are members of this
     program. A NOTARY PUBLIC IS NOT AN ELIGIBLE GUARANTOR.

                                                          Your Investment      9











<PAGE>

<PAGE>

     The tax status of distributions are the same for all shareholders
     regardless of how long they have been in the fund or whether distributions
     are reinvested or paid in cash. In general, distributions are taxable as
     follows:

================================================================================
FEDERAL TAXABILITY OF DISTRIBUTIONS

<TABLE>
<CAPTION>
Type of                     Tax rate for taxpayer       Tax rate for taxpayer subject
distribution                subject to 15% bracket      to 28% bracket or above
- -------------------------------------------------------------------------------------
<S>                          <C>                        <C>
INCOME                      Ordinary Income             Ordinary Income
DIVIDENDS                   Rate                        Rate
- -------------------------------------------------------------------------------------
SHORT-TERM                  Ordinary Income             Ordinary Income
CAPITAL GAINS               Rate                        Rate
- -------------------------------------------------------------------------------------
LONG-TERM
CAPITAL GAINS               10%                         20%
</TABLE>

     Except in tax-advantaged accounts, any sale or exchange of fund shares may
     be a taxable event.

     ANNUAL INFORMATION--Information concerning the tax treatment of dividends
     and other distributions will be mailed to shareholders each year. Each fund
     will also provide annually to its shareholders information regarding the
     source of dividends and distributions of capital gains by that fund.
     Because everyone's tax situation is unique, you should consult your tax
     adviser regarding the treatment of those distributions under the federal,
     state and local tax rules that apply to you as well as the tax consequences
     of gains or losses from the redemption or exchange of your shares.

SERVICES FOR FUND INVESTORS

AUTOMATIC SERVICES

     Buying or selling shares automatically is easy with the services described
     below. With each service, you select a schedule and amount, subject to
     certain restrictions. You can set up most of these services when filling
     out your application or by calling 800-821-5129.

================================================================================
For investing

<TABLE>
<S>                <C>                 
INVEST-A-MATIC     You can make fixed, periodic investments ($50 minimum) into  
(Dollar-cost       your fund account by means of automatic money transfers from 
averaging)         your bank checking account. See the attached application for 
                   instructions.                                                
                   
DIV-MOVE           You can automatically reinvest the dividends and             
                   distributions from your account into another account in any  
                   Eligible Fund ($50 minimum).                                 
                   
For selling shares

SYSTEMATIC         You can make regular withdrawals from most Lord Abbett     
WITHDRAWAL         funds. Automatic cash withdrawals can be paid to you from  
PLAN ("SWP")       your account in fixed or variable amounts. To establish a  
                   plan, the value of your shares must be at least $10,000,   
                   except for Retirement Plans for which there is no minimum. 
                   Your shares must be in non-certificate form.               
                   
CLASS B SHARES     The CDSC will be waived on redemptions of up to 12% of the  
                   current net asset value of your account at the time of your 
                   SWP request. For class B share redemptions over 12% per     
                   year, the CDSC will apply to the entire redemption. Please  
                   contact the fund for assistance in minimizing the CDSC in   
                   this situation.                                             
                   
CLASS B AND        Redemption proceeds due to a SWP for class B and class C  
C SHARES           shares will be redeemed in the order described under      
                   "Purchases."                                              
                   
- -------------------------------------------------------------------------------
</TABLE>

     TAXES ON TRANSACTIONS. The chart at left also can provide a "rule of thumb"
     guide for your potential U.S. federal tax liability when selling or
     exchanging fund shares. The second row, "Short-term capital gains," applies
     to fund shares sold within 12 months of purchase. The third row, "Long-term
     capital gains," applies to shares held for more than 12 months.

     Starting January 1, 2001, sales of securities held for more than five years
     will be taxed at special lower rates.

     Any gains realized on a fund's transactions in options and financial
     futures will be treated as taxable long- or short-term capital gains.

     Lord Abbett offers a variety of Retirement Plans.

     Call 800-253-7299 for information about:

       Traditional, Rollover, Roth and Education IRAs

       Simple IRAs, SEP-IRAs, 401(k) and 403(b) accounts

       Defined Contribution Plans

10 Your Investment





<PAGE>

<PAGE>

<TABLE>

OTHER SERVICES

<S>                                                                       <C>
     TELEPHONE INVESTING. After we have received the attached application
     (selecting "yes" under Section 7C and completing Section 7), you can
     instruct us by phone to have money transferred from your bank account to
     purchase shares of the fund for an existing account. The fund will purchase
     the requested shares when it receives the money from your bank.

     TELEPHONE EXCHANGES. You or your investment professional, with proper
     identification, can instruct your fund by telephone to exchange shares of
     any class for shares of the same class of any Eligible Fund by calling
     800-821-5129. The fund must receive instructions for the exchange before
     the close of the NYSE on the day of your call. If you meet this
     requirement, you will get the NAV per share of the Eligible Fund determined
     on that day. Exchanges will be treated as a sale for federal tax purposes.
     Be sure to read the current prospectus for any fund into which you are
     exchanging.

     REINVESTMENT PRIVILEGE. If you sell shares of the fund, you have a one time
     right to reinvest some or all of the proceeds in the same class of any
     Eligible Fund within 60 days without a sales charge. If you paid a CDSC
     when you sold your shares, you will be credited with the amount of the
     CDSC. All accounts involved must have the same registration.

     ACCOUNT STATEMENTS. Every Lord Abbett investor automatically receives
     quarterly account statements.

     HOUSEHOLDING. Shareholders with the same last name and address will receive
     a single copy of a prospectus and an annual or semi-annual report, unless
     additional reports are specifically requested in writing to the fund.

     ACCOUNT CHANGES. For any changes you need to make to your account, consult
     your investment professional or call the fund at 800-821-5129.

     SYSTEMATIC EXCHANGE. You or your investment professional can establish a
     schedule of exchanges between the same classes of any Eligible Fund.

SALES CHARGES AND SERVICE FEES

     SALES AND SERVICE COMPENSATION. As part of its plan for distributing
     shares, each fund and Lord Abbett Distributor pay sales and service
     compensation to Authorized Institutions that sell the fund's shares and
     service its shareholder accounts.

     Sales compensation originates from two sources: sales charges and 12b-1
     distribution fees that are paid out of each fund's assets. Service
     compensation originates from 12b-1 service fees. The 12b-1 fee rates vary
     by share class, according to the Rule 12b-1 plan adopted by each fund. The
     sales charges and 12b-1 fees paid by investors are shown in the
     class-by-class information under "Fees and Expenses" and "Purchases." The
     portion of these expenses that is paid as sales and service compensation to
     Authorized Institutions, such as your dealer, is shown in the chart at the
     end of this prospectus. The portion of such sales and service compensation
     paid to Lord Abbett Distributor is discussed under "Sales Activities" and
     "Service Activities." Sometimes we do not pay sales and service
     compensation where tracking data is not available for certain accounts or
     where the Authorized Institution waives part of the compensation.

     We may pay Additional Concessions to Authorized Institutions from time to
     time.

     SALES ACTIVITIES. We may use 12b-1 distribution fees to pay Authorized
     Institutions to finance any activity which is primarily intended to result
     in the sale of shares. Lord Abbett Distributor uses its portion of the
     distribution fees attributable to a fund's class A and

<CAPTION>
<S>                                                                         <C>
     TELEPHONE TRANSACTIONS. You have this privilege unless you refuse it in
     writing. For your security, telephone transaction requests are recorded. We
     will take measures to verify the identity of the caller, such as asking for
     your name, account number, social security or taxpayer identification
     number and other relevant information. Each fund will not be liable for
     following instructions communicated by telephone that it reasonably
     believes to be genuine.

     Transactions by telephone may be difficult to implement in times of drastic
     economic or market change.

     Exchanges by telephone should not be used to take advantage of short-term
     swings in the market. Each fund reserves the right to limit or terminate
     this privilege for any shareholder making frequent exchanges or abusing the
     privilege and may revoke the privilege for all shareholders upon 60 days'
     written notice.

     12b-1 FEES ARE PAYABLE REGARDLESS OF EXPENSES. The amounts payable by a
     fund need not be directly related to expenses. If Lord Abbett
     Distributor's actual expenses exceed the fee payable to it, a fund will
     not have to pay more than that fee. If Lord Abbett Distributor's expenses
     are less than the fee it receives, Lord Abbett Distributor will keep the
     full amount of the fee.

</TABLE>

                                                              Your Investment 11





<PAGE>

<PAGE>


     class C shares for activities that are primarily intended to result in the
     sale of such class A and class C shares, respectively. These activities
     include, but are not limited to, printing of prospectuses and statements of
     additional information and reports for other than existing shareholders,
     preparation and distribution of advertising and sales material, expenses of
     organizing and conducting sales seminars, Additional Concessions to
     Authorized Institutions, the cost necessary to provide distribution-related
     services or personnel, travel, office expenses, equipment and other
     allocable overhead.

     SERVICE ACTIVITIES. We may pay Rule 12b-1 service fees to Authorized
     Institutions for any activity which is primarily intended to result in
     personal service and/or the maintenance of shareholder accounts. Any
     portion of the service fees paid to Lord Abbett Distributor will be used to
     service and maintain shareholder accounts.

MANAGEMENT

     The funds' investment adviser is Lord, Abbett & Co., 767 Fifth Avenue, New
     York, NY 10153-0203. Founded in 1929, Lord Abbett manages one of the
     nation's oldest mutual fund complexes, with approximately $28 billion in
     more than 35 mutual fund portfolios and other advisory accounts. For more
     information about the services Lord Abbett provides to the funds, see the
     Statement of Additional Information.

     The fund pays Lord Abbett a monthly fee based on the average daily net
     assets for each month. For the fiscal year ended November 30, 1998, the fee
     paid to Lord Abbett was at an annual rate of .50 of 1% for the U.S.
     Government Securities Fund. Lord Abbett waived its management fee for
     Limited Duration U.S. Government Securities Fund. In addition, the fund
     pays all expenses not expressly assumed by Lord Abbett.

     LIMITED DURATION U.S. GOVERNMENT SECURITIES FUND AND U.S. GOVERNMENT
     SECURITIES FUND. Lord Abbett uses a team of portfolio managers and analysts
     acting together to manage each fund's investments. Robert Gerber, Partner,
     of Lord Abbett and Portfolio Manager of each fund heads the team, the other
     senior members of which include Walter H. Prahl and Robert A Lee. Mr Gerber
     joined Lord Abbett in July 1997 as Director of Taxable Fixed Income. Before
     joining Lord Abbett, Mr. Gerber served as a Senior Portfolio Manager at
     Sanford C. Bernstein & Co., Inc. since 1992. Mr. Prahl joined Lord Abbett
     in 1997 as Director of Quantitative Research, Taxable Fixed Income. Before
     joining Lord Abbett, Mr. Prahl served as a Fixed Income Research Analyst at
     Sanford C. Bernstein & Co. since 1994. Mr. Lee joined Lord Abbett in 1997
     as a Fixed Income Portfolio Manager; prior to that he served as a Portfolio
     Manager at ARM Capital Advisors since 1995.

12 Your Investment







<PAGE>

<PAGE>


                                      For More Information

OTHER INVESTMENT TECHNIQUES

     This section describes some of the investment techniques that might be used
     by each fund and their risks.

     ADJUSTING INVESTMENT EXPOSURE. Each fund may, but is not required to, use
     various strategies to change its investment exposure to adjust to changing
     security prices, interest rates, currency exchange rates, commodity prices
     and other factors. These strategies may involve buying or selling
     derivative instruments, such as options and futures contracts, stripped
     securities, currency exchange contracts, swap agreements, short sales of
     securities, indexed securities and rights and warrants. The fund may use
     these transactions to change the risk and return characteristics of each
     fund's portfolio. If we judge market conditions incorrectly or use a
     strategy that does not correlate well with the fund's investments, it could
     result in a loss, even if we intended to lessen risk or enhance returns.
     These transactions may involve a small investment of cash compared to the
     magnitude of the risk assumed and could produce disproportionate gains or
     losses. Also, these strategies could result in losses if the counterparty
     to a transaction does not perform as promised.

     BORROWING. Each fund may borrow from banks. If a fund borrows money, its
     share price may be subject to greater fluctuation until the borrowing is
     paid off. Each fund may borrow only for temporary or emergency purposes,
     and not in an amount exceeding 33 1/3% of its total assets.

     ILLIQUID SECURITIES. These securities include those that are not traded on
     the open market or that trade irregularly or in very low volume. These may
     include illiquid Rule 144A securities. They may be difficult or impossible
     to sell at the time and price the fund would like. Each fund may invest up
     to 15% of its assets in illiquid securities.

     OPTIONS AND FINANCIAL FUTURES TRANSACTIONS. Each fund may deal in options
     on securities, securities indices, and financial futures transactions,
     including options on financial futures to increase or decrease its exposure
     to changing securities prices or interest rates or for bona fide hedging
     purposes. Each fund may write (sell) covered call options and secured put
     options on up to 25% of its net assets and may purchase put and call
     options and purchase and sell futures contracts provided that no more than
     5% of its net assets (at the time of purchase) may be invested in premiums
     on such options and initial margin deposits on such futures contracts.

     In addition, the use of options and financial futures transactions to
     achieve a fund's investment objective could result in a loss due to
     unanticipated market conditions and could increase the volatility of the
     fund. These transactions may involve a small investment of cash relative to
     the risks assumed.

     PORTFOLIO SECURITIES LENDING. Each fund may lend securities to
     broker-dealers and financial institutions as a means of earning income.
     This practice could result in a loss or delay in recovering a fund's
     securities, if the borrower defaults. The funds will limit their securities
     loans to 30% of their total assets.

     REPURCHASE AGREEMENTS. Each fund may enter into Repurchase Agreements. In a
     Repurchase Agreement, a fund buys a security at one price from a
     broker-dealer or financial institution and simultaneously agrees to sell
     the same security back to the same party at a higher price in the future.
     If the other party to the agreement defaults or becomes insolvent, a fund
     could lose money.

                                                         For More Information 13






<PAGE>

<PAGE>


     REVERSE REPURCHASE AGREEMENTS. Each fund may enter into reverse repurchase
     agreements. In a reverse repurchase agreement, a fund sells a U.S.
     government security to a securities dealer or bank for cash and also agrees
     to repurchase the same security at a set price later. Reverse repurchase
     agreements expose a fund to credit risk (that is, the risk that the
     counterparty will fail to resell the security to the fund), but this risk
     is greatly reduced because the fund receives cash equal to 100% of the
     price of the security sold. Engaging in reverse repurchase agreements also
     involves the use of leverage, in that the fund may reinvest the cash it
     receives in additional securities. Each fund will attempt to minimize this
     risk by managing its duration. A fund's reverse repurchase agreements will
     not exceed 20% of the fund's net assets.

GLOSSARY OF SHADED TERMS

     ADDITIONAL CONCESSIONS. Lord Abbett Distributor may, for specified periods,
     allow dealers to retain the full sales charge for sales of shares or may
     pay an additional concession to a dealer who sells a minimum dollar amount
     of our shares and/or shares of other Lord Abbett-sponsored funds. In some
     instances, such additional concessions will be offered only to certain
     dealers expected to sell significant amounts of shares. Additional
     payments may be paid from Lord Abbett Distributor's own resources or from
     distribution fees received from a fund and will be made in the form of cash
     or, if permitted, non-cash payments. The non-cash payments will include
     business seminars at Lord Abbett's headquarters or other locations,
     including meals and entertainment, or the receipt of merchandise. The cash
     payments may include payment of various business expenses of the dealer.

     In selecting dealers to execute portfolio transactions for a fund's
     portfolio, if two or more dealers are considered capable of obtaining best
     execution, we may prefer the dealer who has sold our shares and/or shares
     of other Lord Abbett-sponsored funds.

     AUTHORIZED INSTITUTIONS. Institutions and persons permitted by law to
     receive service and/or distribution fees under a Rule 12b-1 Plan are
     "Authorized Institutions." Lord Abbett Distributor is an Authorized
     Institution.

     ELIGIBLE FUND. An Eligible Fund is any Lord Abbett-sponsored fund except
     for (1) certain tax-free, single-state funds where the exchanging
     shareholder is a resident of a state in which such series is not offered
     for sale; (2) Lord Abbett Equity Fund; (3) Lord Abbett Series Fund; and (4)
     Lord Abbett U.S. Government Securities Money Market Fund ("GSMMF") (except
     for holdings in GSMMF which are attributable to any shares exchanged from
     the Lord Abbett family of funds). An Eligible Fund also is any Authorized
     Institution's affiliated money market fund satisfying Lord Abbett
     Distributor as to certain omnibus account and other criteria.

     ELIGIBLE MANDATORY DISTRIBUTIONS. If class B shares represent a part of an
     individual's total IRA or 403(b) investment, the CDSC will be waived only
     for that part of a mandatory distribution which bears the same relation to
     the entire mandatory distribution as the B share investment bears to the
     total investment.

     LEGAL CAPACITY. This term refers to the authority of an individual to act
     on behalf of an entity or other person(s). For example, if a redemption
     request were to be made on behalf of the estate of a deceased shareholder,
     John W. Doe, by a person (Robert A. Doe) who has the legal capacity to act
     for the estate of the deceased shareholder because he is the executor of
     the estate, then the request must be executed as follows: Robert A. Doe,
     Executor of the Estate of John W. Doe. That signature using that capacity
     must be guaranteed by an Eligible Guarantor.

14 For More Information







<PAGE>

<PAGE>


     To give another example, if a redemption request is on behalf of the ABC
     Corporation by a person (Mary B. Doe) who has the legal capacity to act on
     behalf of this corporation, because she is the president of the
     Corporation, then the request must be executed as follows: ABC Corporation
     by Mary B. Doe, President. That signature using that capacity must be
     guaranteed by an Eligible Guarantor (see example in right column).

     MUTUAL FUND ADVISORY PROGRAM. Certain unaffiliated authorized brokers,
     dealers, registered investment advisers or other financial institutions who
     either (1) have an arrangement with Lord Abbett Distributor in accordance
     with certain standards approved by Lord Abbett Distributor, providing
     specifically for the use of our shares (and sometimes providing for
     acceptance of orders for such shares on our behalf) in particular
     investment products made available for a fee to clients of such brokers,
     dealers, registered investment advisers and other financial institutions,
     or (2) charge an advisory, consulting or other fee for their services and
     buy shares for their own accounts or the accounts of their clients.

     PURCHASER. The term "purchaser" includes: (1) an individual, (2) an
     individual and his or her spouse and children under the age of 21 and (3) a
     trustee or other fiduciary purchasing shares for a single trust estate or
     single fiduciary account (including a pension, profit-sharing, or other
     employee benefit trust qualified under Section 401 of the Internal Revenue
     Code -- more than one qualified employee benefit trust of a single
     employer, including its consolidated subsidiaries, may be considered a
     single trust, as may qualified plans of multiple employers registered in
     the name of a single bank trustee as one account), although more than one
     beneficiary is involved.

     SPECIAL RETIREMENT WRAP PROGRAM. A program sponsored by an authorized
     institution showing one or more characteristics distinguishing it, in the
     opinion of Lord Abbett Distributor from a Mutual Fund Advisory Program.
     Such characteristics include, among other things, the fact that an
     authorized institution does not charge its clients any fee of a consulting
     or advisory nature that is economically equivalent to the distribution fee
     under the class A 12b-1 Plan and the fact that the program relates to
     participant-directed Retirement Plans.

RECENT PERFORMANCE

     Global political and economic uncertainties triggered a worldwide "flight
     to quality" that pushed U.S. Treasury bond yields significantly lower
     during the fall months. Within this environment, high-quality alternatives
     to U.S. Treasuries, such as mortgaged-backed agency securities, became
     extremely attractive because they provided superior relative yields without
     a significant increase in market risk. Both the U.S. Government Securities
     Fund and Limited Duration U.S. Government Securities Fund emphasized
     mortgage-backed securities, such as FNMAs, FHLMCs, collateralized mortgage
     obligations (CMOs) and commercial-backed securities (CMBS). We believe that
     because mortgage-backed security prices have significantly lagged the
     Treasury market rally, they represent good value for investors. Because we
     expect that current bond market volatility is likely to continue in the
     months ahead, we will take the opportunity during periods of low relative
     prices to add to our overweighting of mortgage-backed securities.

     GUARANTEED SIGNATURE. An acceptable form of guarantee would be as follows:

       In the case of the estate -

         Robert A. Doe
         Executor of the Estate of
         John W. Doe

         [DATE]

         SIGNATURE GUARANTEED
         MEDALLION GUARANTEED
         NAME OF GUARANTOR
         /s/ David R. Levy
         ------------------------
         AUTHORIZED SIGNATURE
         (960)       X9003470
         SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                                      SR
         
       In the case of the corporation - ABC Corporation

       Mary B. Doe
       By Mary B. Doe, President

       [DATE]

         SIGNATURE GUARANTEED
         MEDALLION GUARANTEED
         NAME OF GUARANTOR
         /s/ David R. Levy
         ------------------------
         AUTHORIZED SIGNATURE
         (960)       X9003470
         SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'TM'
                                                      SR

     YEAR 2000 ISSUES. Each fund could be adversely affected if the computers
     used by each fund and their service providers do not properly process and
     calculate date-related information from and after January 1, 2000.

     Lord Abbett is working to avoid such problems and has received assurances
     from each fund's service providers that they are taking similar steps. Of
     course, the Year 2000 problem is unprecedented and therefore Lord Abbett
     cannot eliminate altogether the possibility that it or the funds will be
     affected.

                                                         For More Information 15






<PAGE>

<PAGE>



Limited Duration U.S. Government Securities Fund

Financial Information

FINANCIAL HIGHLIGHTS

     This table describes the fund's performance for the fiscal periods
     indicated. "Total return" shows how much your investment in the fund would
     have increased (or decreased) during each period, assuming you had
     reinvested all dividends and distributions. These Financial Highlights have
     been audited by Deloitte & Touche LLP, the fund's independent auditors, in
     conjunction with their annual audit of the fund's financial statements.
     Financial statements for the fiscal year ended November 30, 1998 and the
     Independent Auditors' Report thereon appear in the Annual Report to
     Shareholders for the fiscal year ended November 30, 1998 and are
     incorporated by reference into the Statement of Additional Information,
     which is available upon request. Certain information reflects financial
     results for a single fund share.

===================================================================
<TABLE>
<CAPTION>
                                                                          CLASS A SHARES
                                                 ---------------------------------------------------------------
                                                   Period Ended November 30,       Period Ended October 31,   
                                                 -------------------------------   -----------------------------
Per Share Operating Performance:                 1998         1997      1996(d)     1996     1995     1994(a) 
<S>                                             <C>          <C>       <C>         <C>      <C>      <C>     
NET ASSET VALUE, BEGINNING OF PERIOD            $4.40        $4.42     $4.39       $4.53    $4.44    $4.85    
- ----------------------------------------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS
- ----------------------------------------------------------------------------------------------------------------
 Net investment income                            .26(e)       .25(e)    .0174       .1912    .2316    .2650  
- ----------------------------------------------------------------------------------------------------------------
 Net realized and unrealized
- ----------------------------------------------------------------------------------------------------------------
  gain (loss) on investments                      .04         (.02)      .0333      (.0751)   .1017   (.4123) 
- ----------------------------------------------------------------------------------------------------------------
Total from investment operations                  .30          .23       .0507       .1161    .3333   (.1473) 
- ----------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
- ----------------------------------------------------------------------------------------------------------------
  Dividends from net investment income           (.24)        (.25)     (.0207)     (.2561)  (.2433)  (.2627) 
- ----------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                  $4.46        $4.40     $4.42       $4.39    $4.53    $4.44    
- ----------------------------------------------------------------------------------------------------------------
TOTAL RETURN(b)                                  7.06%        5.46%     1.15%(c)    2.67%    8.16%   (3.09)%(c)
- ----------------------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
- ----------------------------------------------------------------------------------------------------------------
  Expenses, including waiver and reimbursement   0.47%(f)     0.51%(f)  0.11%(c)    1.81%    1.40%    0.89%(c)
- ----------------------------------------------------------------------------------------------------------------
  Expenses, excluding waiver and reimbursement   1.38%        1.40%     0.13%(c)    2.73%    1.71%    0.89%(c)
- ----------------------------------------------------------------------------------------------------------------
  Net investment income                          5.86%        5.81%     0.41%(c)    4.58%    5.62%    5.61%(c)
================================================================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                            CLASS C SHARES
                                                 -----------------------------------
                                                       Period Ended November 30,
Per Share Operating Performance:                 1998     1997     1996(d)  1996(a)
<S>                                             <C>      <C>      <C>      <C>
NET ASSET VALUE, BEGINNING OF PERIOD            $4.40    $4.42    $4.39    $4.34
- ------------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS
- ------------------------------------------------------------------------------------
 Net investment income                            .22(e)   .21(e)   .0138    .0667
- ------------------------------------------------------------------------------------
 Net realized and unrealized
- ------------------------------------------------------------------------------------
  gain (loss) on investments                      .05     (.02)     .0342    .0515
- ------------------------------------------------------------------------------------
Total from investment operations                  .27      .19      .0480    .1182
- ------------------------------------------------------------------------------------
DISTRIBUTIONS
- ------------------------------------------------------------------------------------
 Dividends from net investment income            (.20)    (.21)    (.0180)  (.0682)
- ------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                  $4.47    $4.40    $4.42    $4.39
- ------------------------------------------------------------------------------------
TOTAL RETURN(b)                                  6.23%    4.45%    1.09%(c) 2.98%(c)
- ------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
- ------------------------------------------------------------------------------------
 Expenses, including waiver and reimbursement    1.35%(f) 1.44%(f) 0.19%(c) 0.69%(c)
- ------------------------------------------------------------------------------------
 Expenses, excluding waiver and reimbursement    2.26%    2.32%    0.21%(c) 0.77%(c)
- ------------------------------------------------------------------------------------
 Net investment income                           4.94%    4.84%    0.33%(c) 1.26%(c)
====================================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                 Period Ended November 30,         Period Ended October 31,
                                               ----------------------------      -----------------------------
SUPPLEMENTAL DATA FOR ALL CLASSES:               1998     1997     1996(d)        1996       1995       1994
<S>                                            <C>      <C>      <C>            <C>        <C>        <C> 
NET ASSETS, END OF PERIOD (000)                $11,000  $10,276  $12,696        $12,735     $8,922    $10,256
- -------------------------------------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                        346.67%  343.53%  175.98%        340.62%     222.00%   895.63%
- -------------------------------------------------------------------------------------------------------------
</TABLE>

(a) Commencement of offering respective class shares (class A - November 4, 1993
    and; class C - July 15, 1996).

(b) Total return does not consider the effects of sales loads and assumes the
    reinvestment of all distributions.

(c) Not annualized.

(d) For the month ended November 30, 1996.

(e) Calculated using average shares outstanding during the period.

(f) The ratios for 1998 and 1997 include expenses paid through an expense offset
    arrangement.

    See Notes to Financial Statements.

16 Financial Information








<PAGE>

<PAGE>



Limited Duration U.S. Government Securities Fund

LINE GRAPH COMPARISON

     Immediately below is a comparison of a $10,000 investment in class A shares
     to the same investment in Lipper's Short U.S. Government Fund Index,
     Lipper's Intermediate U.S. Government Fund Index, and Lehman Intermediate
     Government Bond Index, assuming reinvestment of all dividends and
     distributions.


[GRAPH]


               Fiscal Year-end 11/30
     The fund (class A shares) at net asset value
     The fund (class A shares) maximum offering price(1)
     Lehman Intermediate Government Bond Index(2)

========================================================================
               Average Annual Total Return At Maximum Applicable
             Sales Charge For The Periods Ending November 30, 1998

<TABLE>
<CAPTION>
                       1 YEAR              10 YEARS (OR LIFE)
- ------------------------------------------------------------------------
<S>                     <C>                         <C>
Class A(3)             3.70%                      7.76%
- ------------------------------------------------------------------------
Class C(1)             8.47%                      8.82%
- ------------------------------------------------------------------------
</TABLE>

     (1) This shows total return applicable to class C shares, with all
         dividends and distributions reinvested for the periods shown ending
         November 30, 1998, using the SEC-required uniform method to compute
         such return.

     (2) Performance for the unmanaged Lipper's U.S. Government Fund Index,
         Lipper's Intermediate U.S. Government Fund Index, and Lehman
         Intermediate Government Bond Index does not reflect transaction costs,
         management fees or sales charges.

     (3) The class A and C shares were first offered on 11/4/93 and 7/15/96,
         respectively. For class A shares, performance is at net asset value.


                                                        Financial Information 17








<PAGE>

<PAGE>



                                                 U.S. Government Securities Fund


FINANCIAL HIGHLIGHTS

This table describes the fund's performance for the fiscal periods indicated.
"Total return" shows how much your investment in the fund would have increased
(or decreased) during each period, assuming you had reinvested all dividends and
distributions. These Financial Highlights have been audited by Deloitte & Touche
LLP, the fund's independent auditors, in conjunction with their annual audit of
the fund's financial statements. Financial statements for the fiscal year ended
November 30, 1998 and the Independent Auditors' Report thereon appear in the
Annual Report to Shareholders for the fiscal year ended November 30, 1998 and
are incorporated by reference into the Statement of Additional Information,
which is available upon request. Certain information reflects financial results
for a single fund share.

<TABLE>
<CAPTION>
====================================================================================================
                                                                 CLASS A SHARES
                                         -----------------------------------------------------------
                                                             Year Ended November 30,
Per Share Operating Performance:            1998         1997         1996       1995       1994
<S>                                        <C>          <C>          <C>        <C>        <C>  
NET ASSET VALUE, BEGINNING OF YEAR         $2.59        $2.63        $2.73      $2.59      $3.00
- ----------------------------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS
- ----------------------------------------------------------------------------------------------------
 Net investment income                       .17(d)       .20(d)       .215       .235       .247
- ----------------------------------------------------------------------------------------------------
 Net realized and unrealized
- ----------------------------------------------------------------------------------------------------
  gain (loss) on investments                 .05         (.03)        (.105)      .136      (.3685)
- ----------------------------------------------------------------------------------------------------
Total from investment operations             .22          .17          .11        .371      (.1215)
- ----------------------------------------------------------------------------------------------------
DISTRIBUTIONS
- ----------------------------------------------------------------------------------------------------
 Dividends from net investment income       (.17)        (.21)        (.21)      (.231)     (.246)
- ----------------------------------------------------------------------------------------------------
 Distribution from net realized gain         --           --           --         --        (.0425)
- ----------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR               $2.64        $2.59        $2.63      $2.73      $2.59
- ----------------------------------------------------------------------------------------------------
TOTAL RETURN(b)                             8.86%        6.67%        4.41%     14.89%     (4.24)%
- ----------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
- ----------------------------------------------------------------------------------------------------
 Expenses                                   0.96%(e)     0.92%(e)     0.88%      0.90%      0.90%
- ----------------------------------------------------------------------------------------------------
 Net investment income                      6.36%        7.82%        8.12%      8.85%      8.92%
- ----------------------------------------------------------------------------------------------------
====================================================================================================
</TABLE>

<TABLE>
<CAPTION>
========================================================================================================
                                                 CLASS B SHARES                   CLASS C SHARES
                                         -------------------------------  ------------------------------
                                             Year Ended November 30,          Year Ended November 30,
Per Share Operating Performance:          1998       1997       1996(a)    1998       1997       1996(a)
<S>                                      <C>        <C>        <C>        <C>        <C>        <C>  
NET ASSET VALUE, BEGINNING OF PERIOD     $2.58      $2.63      $2.57      $2.59      $2.63      $2.55
- --------------------------------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS
- --------------------------------------------------------------------------------------------------------
 Net investment income                     .14(d)     .18(d)     .063       .15(d)     .18(d)     .066
- --------------------------------------------------------------------------------------------------------
 Net realized and unrealized
- --------------------------------------------------------------------------------------------------------
  gain (loss) on investments               .07       (.04)       .060       .06       (.03)       .085
- --------------------------------------------------------------------------------------------------------
Total from investment operations           .21        .14        .123       .21        .15        .151
- --------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
- --------------------------------------------------------------------------------------------------------
 Dividends from net investment income     (.15)      (.19)      (.063)     (.15)      (.19)      (.071)
- --------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD           $2.64      $2.58      $2.63      $2.65      $2.59      $2.63
- --------------------------------------------------------------------------------------------------------
TOTAL RETURN(b)                           8.49%      5.47%      5.45%(c)   8.47%      5.86%      6.49%(c)
- --------------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
- --------------------------------------------------------------------------------------------------------
 Expenses                                 1.66%(e)   1.64%(e)   0.48%(c)   1.62%(e)   1.55%(e)   0.60%(c)
- --------------------------------------------------------------------------------------------------------
 Net investment income                    5.36%      6.77%      2.21%(c)   5.69%      7.25%      2.60%(c)
- --------------------------------------------------------------------------------------------------------
========================================================================================================
</TABLE>

<TABLE>
<CAPTION>
===============================================================================================================
                                                                Year Ended November 30,
                                     --------------------------------------------------------------------------
SUPPLEMENTAL DATA FOR ALL CLASSES:        1998           1997           1996           1995           1994
<S>                                    <C>            <C>            <C>            <C>            <C>       
NET ASSETS, END OF YEAR (000)          $1,902,404     $2,286,412     $2,907,291     $3,272,865     $3,232,012
- ---------------------------------------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                  440.49%        712.82%        820.59%        544.31%        790.57%
- ---------------------------------------------------------------------------------------------------------------
</TABLE>

(a)  Commencement of offering respective class shares (class B - August 1, 1996
     and; class C - July 15, 1996).
(b)  Total return does not consider the effects of sales loads and assumes the
     reinvestment of all distributions.
(c)  Not annualized.
(d)  Calculated using average shares outstanding during the period.
(e)  The ratios for 1998 and 1997 include expenses paid through an expense
     offset arrangement.
     See Notes to Financial Statements.


18   Financial Information






<PAGE>

<PAGE>



                                                 U.S. Government Securities Fund

LINE GRAPH COMPARISON - U.S. Government Securities Fund

     Immediately below is a comparison of a $10,000 investment in class A shares
     to the same investment in both the Lipper's General U.S. Government Bond
     Fund Index and the Lehman Government Bond Index, assuming reinvestment of
     all dividends and distributions.

- -------------------------------------------------------------------------------

[GRAPH]

                Fiscal Year-end 11/30
     The fund (class A shares) at net asset value
     The fund (class A shares) maximum offering price(1)
     Lipper's General U.S. Government Bond Fund Index(2)

===============================================================================

               Average Annual Total Return At Maximum Applicable
             Sales Charge For The Periods Ending November 30, 1998

<TABLE>
<CAPTION>
                                           1 YEAR       10 YEARS (OR LIFE)
- --------------------------------------------------------------------------
<S>                                         <C>               <C>
Class A(1)                                  3.70%             7.76%
- --------------------------------------------------------------------------
Class B(2)                                  4.15%             6.98%
- --------------------------------------------------------------------------
Class C(3)                                  8.47%             8.82%
- --------------------------------------------------------------------------
</TABLE>


- -------------------------------------------------------------------------------
     (1)  This shows total return which is the percent change in value, after
          deduction of the maximum initial sales charge of 5.75% applicable to
          class A shares, with all dividends and distributions reinvested for
          the periods shown ending November 30, 1998, using the SEC-required
          uniform method to compute such return.

     (2)  The class B shares were first offered on 8/1/96. Performance reflects
          the deduction of a CDSC of 4% (for 1 year) and 3% (life of the class).

     (3)  The class C shares were first offered on 7/15/96. Performance is at
          net asset value.



                                                     Financial Information    19






<PAGE>

<PAGE>



COMPENSATION FOR YOUR DEALER - Limited Duration U.S. Government Securities Fund

<TABLE>
<CAPTION>
===========================================================================================================================
                                              FIRST YEAR COMPENSATION

                             Front-end
                             sales charge           Dealer's
                             paid by investors      concession             Service fee(1)         Total compensation(2)
Class A investments          (% of offering price)  (% of offering price)  (% of net investment)  (% of offering price)
===========================================================================================================================
<S>                                 <C>                   <C>                  <C>                   <C>  
Less than $100,000                  3.00%                 2.50%                0.00%                 2.50%
- ---------------------------------------------------------------------------------------------------------------------------
$100,000 - $249,999                 2.50%                 2.25%                0.00%                 2.25%
- ---------------------------------------------------------------------------------------------------------------------------
$250,000 - $499,999                 2.00%                 1.75%                0.00%                 1.75%
- ---------------------------------------------------------------------------------------------------------------------------
$500,000 - $999,999                 1.50%                 1.25%                0.00%                 1.25%
- ---------------------------------------------------------------------------------------------------------------------------
$1,000,000 - $2,999,999             1.00%                 1.00%                0.00%                 1.00%
- ---------------------------------------------------------------------------------------------------------------------------
$3,000,000 - $9,999,999             0.50%                 0.50%                0.00%                 0.50%
- ---------------------------------------------------------------------------------------------------------------------------
Over $10 million                    0.25%                 0.25%                0.00%                 0.25%
===========================================================================================================================
Class C investments                              Paid at time of sale (% of net asset value)
- ---------------------------------------------------------------------------------------------------------------------------
All amounts               no front-end sales charge       0.75%                0.25%                 1.00%
- ---------------------------------------------------------------------------------------------------------------------------
Class P investments                              Percentage of average net assets
- ---------------------------------------------------------------------------------------------------------------------------
All amounts               no front-end sales charge       0.25%                0.20%                 0.45%
===========================================================================================================================
                             ANNUAL COMPENSATION AFTER FIRST YEAR
Class A investments
- ---------------------------------------------------------------------------------------------------------------------------
All amounts               no front-end sales charge        none                0.00%                 0.00%
- ---------------------------------------------------------------------------------------------------------------------------
Class C investments                              Percentage of average net assets(3)
- ---------------------------------------------------------------------------------------------------------------------------
All amounts               no front-end sales charge        0.65%               0.25%                 0.90%
- ---------------------------------------------------------------------------------------------------------------------------
Class P investments                              Percentage of average net assets
- ---------------------------------------------------------------------------------------------------------------------------
All amounts               no front-end sales charge        0.25%               0.20%                 0.45%
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1)  The class A share 12b-1 Plan for the Limited Duration U.S. Government
     Securities Fund will go into effect on the first day of the calendar
     quarter subsequent to the fund's net assets reaching $100 million at which
     time for the following categories: over $1 million, or a retirement plan --
     100 or more eligible employees, or a special retirement wrap program,
     authorized institutions will receive concessions as set forth on the U.S.
     Government Securities Fund chart on the next page for such categories.

(2)  Dealer's concession percentages and service fee percentages are calculated
     from different amounts, and therefore may not equal total compensation
     percentages if combined using simple addition. Additional Concessions may
     be paid to Authorized Institutions from time to time.

(3)  With respect to class C and P shares, 0.90% and 0.45%, respectively, of the
     average annual net asset value of such shares outstanding during the
     quarter (including distribution reinvestment shares after the first
     anniversary of their issuance) is paid to Authorized Institutions. This fee
     is paid quarterly in arrears. In the case of C shares for fixed-income
     funds, such as Limited Duration U.S. Government Securities Fund, 0.10% of
     the average annual net asset value of such shares is retained by Lord
     Abbett Distributor, thus reducing the dealer's concession from 0.75% to
     0.65% after the first year. Lord Abbett Distributor uses this 0.10% for
     expenses primarily intended to result in the sale of such fund's shares.



20   Financial Information






<PAGE>

<PAGE>



COMPENSATION FOR YOUR DEALER - U.S. Government Securities Fund

<TABLE>
<CAPTION>
===========================================================================================================================
                                              FIRST YEAR COMPENSATION

                             Front-end
                             sales charge           Dealer's
                             paid by investors      concession             Service fee(1)         Total compensation(2)
Class A investments          (% of offering price)  (% of offering price)  (% of net investment)  (% of offering price)
===========================================================================================================================
<S>                                 <C>                   <C>                  <C>                   <C>  
Less than $50,000                   4.75%                 4.00%                0.25%                 4.25%
- ---------------------------------------------------------------------------------------------------------------------------
$50,000 - $99,999                   4.75%                 4.25%                0.25%                 4.50%
- ---------------------------------------------------------------------------------------------------------------------------
$100,000 - $249,999                 3.75%                 3.25%                0.25%                 3.50%
- ---------------------------------------------------------------------------------------------------------------------------
$250,000 - $499,999                 2.75%                 2.50%                0.25%                 2.75%
- ---------------------------------------------------------------------------------------------------------------------------
$500,000 - $999,999                 2.00%                 1.75%                0.25%                 2.00%
- ---------------------------------------------------------------------------------------------------------------------------
$1 million or more(3) or Retirement Plan - 100 or more
eligible employees(3) or Special Retirement Wrap Program(3)
- ---------------------------------------------------------------------------------------------------------------------------
First $5 million             no front-end sales charge    1.00%                0.25%                 1.25%
- ---------------------------------------------------------------------------------------------------------------------------
Next $5 million above that   no front-end sales charge    0.55%                0.25%                 0.80%
- ---------------------------------------------------------------------------------------------------------------------------
Next $40 million above that  no front-end sales charge    0.50%                0.25%                 0.75%
- ---------------------------------------------------------------------------------------------------------------------------
Over $50 million             no front-end sales charge    0.25%                0.25%                 0.50%
===========================================================================================================================
Class B investments                                 Paid at time of sale (% of net asset value)
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge    3.75%                0.25%                 4.00%
===========================================================================================================================
Class C investments
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge    0.75%                0.25%                 1.00%
- ---------------------------------------------------------------------------------------------------------------------------
Class P investments                                 Percentage of average net assets
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge    0.25%                0.20%                 0.45%
- ---------------------------------------------------------------------------------------------------------------------------
===========================================================================================================================

                                     ANNUAL COMPENSATION AFTER FIRST YEAR
Class A investments
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge     none                0.25%                 0.25%
===========================================================================================================================
Class B investments                                 Percentage of average net assets(4)
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge     none                0.25%                 0.25%
===========================================================================================================================
Class C investments
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge     0.65%               0.25%                 0.90%
- ---------------------------------------------------------------------------------------------------------------------------
Class P investments                                 Percentage of average net assets
- ---------------------------------------------------------------------------------------------------------------------------
All amounts                  no front-end sales charge     0.25%               0.20%                 0.45%
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1)  The service fee for class A shares is paid quarterly and for class A shares
     may not exceed 0.15% if sold prior to September 1, 1985. The first year's
     service fee on class B and C shares is paid at the time of sale.

(2)  Reallowance/concession percentages and service fee percentages are
     calculated from different amounts, and therefore may not equal total
     compensation percentages if combined using simple addition. Additional
     Concessions may be paid to Authorized Institutions from time to time.

(3)  Concessions are paid at the time of sale on all class A shares sold during
     any 12-month period starting from the day of the first net asset value
     sale. With respect to (a) class A share purchases at $1 million or more,
     sales qualifying at such level under rights of accumulation and statement
     of intention privileges are included and (b) for Special Retirement Wrap
     Programs, only new sales are eligible and exchanges into the fund are
     excluded.

(4)  With respect to class B, C and P shares, 0.25%, 0.90% and 0.45%,
     respectively, of the average annual net asset value of such shares
     outstanding during the quarter (including distribution reinvestment shares
     after the first anniversary of their issuance) is paid to Authorized
     Institutions. These fees are paid quarterly in arrears. In the case of
     class C shares for fixed-income funds, such as U.S. Government Securities
     Fund, 0.10% of the average net asset value of such shares is retained by
     Lord Abbett Distributor, thus reducing from 0.75% to 0.65% after the first
     year. Lord, Abbett & Co. uses 0.10% for expenses primarily intended to
     result in the sale of such funds' shares.



                                                       Financial Information 21






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<PAGE>

<PAGE>







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<PAGE>

<PAGE>







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<PAGE>

<PAGE>



     More information on these funds is available free upon request, including
     the following:

ANNUAL/SEMI-ANNUAL REPORT

     Describes the funds, lists portfolio holdings and contains a letter from
     the fund's manager discussing recent market conditions and each fund's
     investment strategies.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

     Provides more details about the funds and their policies. A current SAI is
     on file with the Securities and Exchange Commission ("SEC") and is
     incorporated by reference (is legally considered part of this prospectus).

     Lord Abbett Investment Trust -
       Limited Duration U.S. Government Securities Series
       U.S. Government Securities Series

     The General Motors Building
     767 Fifth Avenue
     New York, NY 10153-0203
     --------------------------
     SEC file number: 811-7988


     To obtain information:

     BY TELEPHONE. Call the funds at:
     800-426-1130

     BY MAIL. Write to the funds at:
     The Lord Abbett Family of Funds
     767 Fifth Avenue
     New York, NY 10153-0203

     VIA THE INTERNET.
     LORD, ABBETT & CO.
     http://www.lordabbett.com

     Text only versions of fund documents can be viewed online or downloaded
     from:

     SEC
     http://www.sec.gov

     You can also obtain copies by visiting the SEC's Public Reference Room in
     Washington, DC (phone 800-SEC-0330) or by sending your request and a
     duplicating fee to the SEC's Public Reference Section, Washington, DC
     20549-6009.

     LAIT-1-499
     (4/99)






<PAGE>

<PAGE>

===============================================================================

Lord Abbett

Core Fixed Income Fund
Strategic Core Fixed Income Fund

Class Y Shares
Prospectus
April 1, 1999

[LOGO]

As with all mutual funds, the Securities and Exchange Commission does not
guarantee that the information in this prospectus is accurate or complete, and
it has not judged these funds for investment merit. It is a criminal offense to
state otherwise.

Class Y shares of each fund are neither offered to the general public nor
available in all states through the Mutual Fund Advisory Program. Please call
800-821-5129 for further information.







<PAGE>

<PAGE>

Table of Contents

<TABLE>
<CAPTION>
                                     The Funds                          Page
<S>                                  <C>                                <C>
                                     Goal/Approach                       2
                                     Main Risks                          3
Information about past               Core Fixed Income Fund              4
performance, fees and expenses       Strategic Core Fixed Income Fund    5

                                     Your Investment

Information for managing             Purchases                           6
your fund account                    Redemptions                         7
                                     Distributions and Taxes             7
                                     Services For Fund Investors         8
                                     Management                          8

                                     For More Information

How to learn more                    Other Investment Techniques         9
about the funds                      Glossary of Shaded Terms           10
                                     Recent Performance                 10

                                     Financial Information

Financial highlights                 Core Fixed Income Fund             11
and line graph comparison

How to learn more about the          Back Cover
funds and other Lord Abbett funds
</TABLE>





<PAGE>

<PAGE>

Core Fixed Income Fund
Strategic Core Fixed Income Fund

The Funds

GOAL/APPROACH


     Each fund seeks income and capital appreciation to produce a high total
     return. In doing this, each fund will attempt to keep its exposure to
     interest rate changes generally in line with that of the bond market
     generally. it will do that by managing its duration. Duration is a
     statistical concept that measures a portfolio's exposure to interest rate
     changes. The higher a fund's duration, the more sensitive it is to interest
     rate risk.

     Both funds attempt to manage, but not eliminate, interest rate risk by
     maintaining the average duration of the securities they hold within two
     years of the duration of the Lehman Brothers Aggregate Bond Index
     (currently _ years). Thus, each fund expects to have exposure to interest
     rate risk (or volatility) approximating an average duration falling within
     a range of _ and _ years. Using the average duration of the Lehman Brothers
     Aggregate Bond Index (currently _ years) as the center, the funds will
     establish their average duration range periodically by extending two years
     above and below the center.

     The Core Fixed Income Fund will invest in three sectors of the fixed-income
     securities markets: U.S. government securities, mortgage-backed securities,
     and investment grade debt securities. Lord Abbett will allocate the fund's
     assets among these three sectors seeking incremental yield advantages.
     There are no limits on allocations among these sectors.

     The Strategic Core Fixed Income Fund will invest in five sectors of the
     fixed-income securities markets: U.S. government securities,
     mortgage-backed securities, investment grade debt securities, high yield
     debt securities, and foreign debt securities. Lord Abbett will allocate the
     fund's assets among these five sectors seeking incremental yield
     advantages. The fund will not invest more than 20% of its net assets in
     high yield debt securities. Also, it will not invest more than 20% of its
     assets in foreign debt securities.

     Each fund may engage in active and frequent trading of its portfolio
     securities to achieve its principal investment strategies and can be
     expected to have portfolio turnover rates substantially in excess of 100%.
     The funds do not expect these strategies to have significant transaction
     costs or adverse tax consequences.


     WE OR THE FUND refers to Lord Abbott Core Fixed Income Fund ("Core Fixed
     Income Fund") or Lord Abbott Strategic Core Fixed Income Fund ("Strategic
     Core Fixed Income Fund"), each a portfolio of Lord Abbott Investment Trust
     (the "company"). The funds operate under the supervision of the company's
     Board, with the advice of Lord, Abbott & Co. ("Lord Abbett"), their
     investment manager.

     ABOUT EACH FUND. Each fund is a professionally managed portfolio primarily
     holding securities purchased with the pooled money of investors. They
     strive to reach their stated goals, although as with all funds, they cannot
     guarantee results.

     U.S. GOVERNMENT SECURITIES are obligations issued or guaranteed by the U.S.
     government, its agencies or instrumentalities.

     MORTGAGE-BACKED SECURITIES directly or indirectly represent a participation
     in, or are secured by and payable from, mortgage loans secured by real
     property. The price of a mortgage-backed security may be significantly
     affected by changes in interest rates. Some mortgage-backed securities have
     structures that make their reaction to interest rates and other factors
     difficult to predict, making their prices very volatile.

     FOREIGN DEBT SECURITIES include obligations of foreign governments, their
     agencies and instrumentalities, and fixed-income securities of other
     issuers denominated in foreign-currency. Foreign securities are not subject
     to the same degree of regulation and may be more volatile and less liquid
     than securities traded in major U.S. markets. This affects block trading.
     Foreign securities may trade on days when a fund does not value them so
     that fund share prices could be affected on days an investor can-
     not purchase or sell shares. Other risks include less information on public
     companies, banks and governments; political and social instability;
     expropriations; higher transaction costs; currency fluctuations;
     nondeductable withholding taxes, credit risk and different accounting and
     settlement practices.


2  The Funds




<PAGE>

<PAGE>

MAIN RISKS

     Both funds face interest rate risk, credit risk, and prepayment risk. In
     addition, the Strategic Core Fixed Income Fund faces currency risk.



       INTEREST RATE RISK -- Generally, the prices of fixed-income securities
       rise when interest rates fall and fall when interest rates rise.
       Longer-term bonds are usually more sensitive to interest rate changes.
       Put another way, the longer the maturity of a bond or other debt
       security, the greater the effect a change in interest rates is likely to
       have on the instrument's price. Both funds expect to have exposures to
       interest rate changes approximating that of the overall bond market.

       CREDIT RISK -- The lower-rated bonds, including high yield and foreign
       debt securities, in which the Strategic Core Fixed Income Fund invests
       involve risks that the interest and principal payments may not be made.
       Some issuers may default as to principal and/or interest payments after
       the fund purchases their securities.

       PREPAYMENT RISK -- If interest rate movements cause either fund's
       mortgage-backed securities and callable securities to be paid off
       substantially earlier than expected, the fund's share price or yield
       could be hurt.

       CURRENCY RISK -- Because it invests in foreign securities, the Strategic
       Core Fixed Income Fund faces the risk that unfavorable changes in
       currency  exchange rates could reduce the fund's share price.

     An investment in each fund is not a bank deposit. It is not FDIC-insured or
     government-endorsed. It is not a complete investment program. You could
     lose money in each fund, but you also have the potential to make money.

     INVESTMENT GRADE DEBT SECURITIES are, at the time of purchase, rated in one
     of the four highest grades determined either by Moody's Investors Service,
     Inc. or Standard & Poor's Ratings Services, or determined by Lord Abbett to
     be equivalent in quality.

     HIGH YIELD DEBT SECURITIES or "junk bonds" are rated BB/Ba or lower or
     unrated and typically pay a higher yield than investment grade debt
     securities. These bonds have a higher risk of default than investment grade
     bonds and their prices can be much more volatile.

     You should read this entire prospectus, including "Other Investment
     Techniques," which concisely describes the other investment strategies and
     their risks used by the fund.





                                                                     The Funds 3






<PAGE>

<PAGE>

Core Fixed Income Fund

PAST PERFORMANCE

     The information below provides some indication of the risks of investing in
     the fund by showing changes in the fund's performance from calendar year to
     calendar year and by showing how the fund's average annual returns compare
     with those of a broad measure of market performance.

                                 AWAITING DATA


================================================================================
The table below shows a comparison of the fund's class Y average annual total
return to that of the Lehman Brothers Aggregate Bond Index. Fund returns assume
reinvestment of dividends and distributions at net asset value. All periods end
on December 31, 1998.

<TABLE>
<CAPTION>
CLASS                                           1 YEAR            INCEPTION(i)
<S>                                             <C>                <C>      
Y                                               0.00.%                0.00.%
- -------------------------------------------------------------------------------
Lehman Brothers Aggregate Bond lndex(ii)        0.00.%                0.00.%
- -------------------------------------------------------------------------------
</TABLE>

FEES AND EXPENSES

     This table describes the fees and expenses that you may pay if you buy and
     hold shares of the fund.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------
Fee table
- -----------------------------------------------------------------------------------------------------
<S>                                                                                   <C>
                                                                                      CLASS Y
SHAREHOLDER FEES (Fees paid directly from your investment)
- -----------------------------------------------------------------------------------------------------
Maximum Sales Charge on Purchases
- -----------------------------------------------------------------------------------------------------
(as a % of offering price)                                                             none
- -----------------------------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")                                        none
- -----------------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES (Expenses deducted from fund assets) (as a % of average net assets)(1)
- -----------------------------------------------------------------------------------------------------
Management Fees (See "Management")                                                     0.50%
- -----------------------------------------------------------------------------------------------------
Other Expenses (See "Management")                                                      0.30%
- -----------------------------------------------------------------------------------------------------
Total Operating Expenses                                                               0.80%
- -----------------------------------------------------------------------------------------------------
</TABLE>


     

- --------------------------------------------------------------------------------
Expense example
- --------------------------------------------------------------------------------
This example, like that in other funds' prospectuses, assumes a $10,000 initial
investment, 5% total return each year and no changes in expenses. You pay the
following expenses over the course of each period shown if you sell your shares
at the end of the period, although your actual cost may be higher or lower. You
would pay the same expenses, assuming you kept your shares.

<TABLE>
<CAPTION>
SHARE CLASS                       1 YEAR                  3 YEARS
<S>                               <C>                     <C>
Class Y shares                    $80                     $0
- --------------------------------------------------------------------------------
</TABLE>

This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.


     Past performance is not a prediction of future results.
     ------------------------------------------
     (i) The date of inception of class Y is 12/10/97.

     (ii) Performance for the unmanaged Lehman Brothers Aggregate Bond Index
     does not reflect transaction costs or management fees.

     MANAGEMENT FEES are payable to Lord Abbett for the fund's investment
     management.

     OTHER EXPENSES include fees paid for miscellaneous items such as transfer
     agency, legal and share registration fees.
     ------------------------------------------
     (1) The annual operating expenses are based on estimated amounts for the
         current fiscal year.


4 The Funds






<PAGE>

<PAGE>

Strategic Core Fixed Income Fund

PAST PERFORMANCE

     Because the fund is new, information regarding past performance is not
     available.

FEES AND EXPENSES

     This table describes the fees and expenses that you may Pay if you buy and
     hold shares of the fund.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
Fee table
- --------------------------------------------------------------------------------------------------------
                                                                                       CLASS Y
<S>                                                                                     <C>
SHAREHOLDER FEES (Fees paid directly from your investment)
- --------------------------------------------------------------------------------------------------------
Maximum Sales Charge on Purchases                                                        
- --------------------------------------------------------------------------------------------------------
(as a % of offering price)                                                               none
- --------------------------------------------------------------------------------------------------------
Maximum Deferred Sales Charge (See "Purchases")                                          none
- --------------------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES (Expenses deducted from fund assets) (as a % of average not assets)(1)
- --------------------------------------------------------------------------------------------------------
Management Fees (see "Management")                                                       0.50%
- --------------------------------------------------------------------------------------------------------
Other Expenses (See "Management")                                                        0.26% 
- --------------------------------------------------------------------------------------------------------
Total Operating Expenses                                                                 0.76%
- --------------------------------------------------------------------------------------------------------
</TABLE>


- -------------------------------------------------------------------------------
Expense example
- -------------------------------------------------------------------------------
This example, like that in other fund's prospectuses, assumes a $10,000 initial
investment, 5% total return each year and no changes in expenses. You pay the
following expenses over the course of each period shown if you sell your shares
at the end of the period, although your actual cost may be higher or lower. You
would pay the same expenses, assuming you kept your shares.

<TABLE>
<CAPTION>
SHARE CLASS                              1 YEAR
<S>                                      <C>
Class Y Shares                           $76
- -----------------------------------------------
</TABLE>


This example is for comparison and is not a representation of the fund's actual
expenses or returns, either past or present.

     MANAGEMENT FEES are payable to Lord Abbett for the fund's investment
     management.

     OTHER EXPENSES include fees paid for miscellaneous items such as transfer
     agency, legal and share registration fees.
     ------------------------------------------
     (1) The annual operating expenses are based on estimated amounts for the
         current fiscal year

                                                                     The Funds 5






<PAGE>

<PAGE>

Your Investment


PURCHASES

     CLASS Y SHARES. Class Y shares are purchased at net asset value ("NAV")
     with no sales charge of any kind. The NAV of our shares is calculated every
     business day as of the close of the New York Stock Exchange. Our shares are
     continuously offered. The offering price is based on NAV per share next
     determined after we receive your order submitted in proper form. We reserve
     the right to withdraw all or any part of the offering made by this
     Prospectus, or to reject any purchase order. We also reserve the right to
     waive or change minimum investment requirements. All purchase orders are
     subject to our acceptance and are not binding until confirmed or accepted
     in writing.

     WHO MAY INVEST? Eligible purchasers of Class Y shares include: (i) certain
     authorized brokers, dealers, registered investment advisers or other
     financial institutions who either (a) have an arrangement with Lord Abbett
     Distributor in accordance with certain standards approved by Lord Abbett
     Distributor, providing specifically for the use of our Class Y shares in
     particular investment products made available for a fee to clients of such
     brokers, dealers, registered investment advisers or other financial
     institutions, or (b) charge an advisory consulting or other fee for their
     services and buy shares for their own accounts or the accounts of their
     clients ("Mutual Fund Advisory Programs"), (ii) the trustee or custodian
     under any deferred compensation or pension or profit-sharing plan or
     payroll deduction IRA established for the benefit of the employees of any
     company with an account(s) in excess of $10 million managed by Lord Abbett
     or its sub-advisors on a private-advisory-account basis, and (iii)
     institutional investors, including retirement plans, companies,
     foundations, trusts, endowments and other entities where the total amount
     of potential investable assets exceeds $20 million that were not introduced
     to Lord Abbett by persons associated with a broker or dealer primarily
     involved in the retail security business. Additional payments may be made
     by Lord Abbett out of its own resources with respect to certain of these
     sales.

     HOW MUCH MUST YOU INVEST? You may buy our shares through any independent
     securities dealer having a sales agreement with Lord Abbett Distributor,
     our exclusive selling agent. Place your order with your investment dealer
     or send the funds to the fund you selected (P.O. Box 419100, Kansas City,
     Missouri 64141). The minimum initial investment is $1 million except for
     Mutual Fund Advisory Programs which have no minimum. This offering may be
     suspended, changed or withdrawn by Lord Abbett Distributor which reserves
     the right to reject any order.

     BUYING SHARES THROUGH YOUR DEALER. Orders for shares received by a fund
     prior to the close of the NYSE, or received by dealers prior to such close
     and received by Lord Abbett Distributor prior to the close of its business
     day, will be confirmed at NAV effective at such NYSE close. Orders received
     by dealers after the NYSE closes and received by Lord Abbett Distributor in
     proper form prior to the close of its next business day are executed at the
     NAV effective as of the close of the NYSE on that next business day. The
     dealer is responsible for the timely transmission of orders to Lord Abbett
     Distributor. A business day is a day on which the NYSE is open for trading.

     BUYING SHARES BY WIRE. To open an account, call 800-821-5129 Ext. 34028,
     Institutional Trade Dept., to set up your account and to arrange a wire
     transaction. Wire to: United Missouri Bank of Kansas City, N.A., Routing
     number - 101000695, bank account number: 9878002611, FBO: (account name)
     and (your Lord Abbett account number). Specify
     the complete name of the fund of your choice, note Class Y shares and
     include your new account number and your name. To add to an existing
     account, wire to: United Missouri Bank of Kansas City, N.A., routing number
     - 101000695, bank account number: 9878002611, FBO: (account name) and (your
     Lord Abbett account number). Specify the complete name of the fund of your
     choice, note Class Y shares and include your account number and your name.



     NAV per share is calculated each business day at the close of regular
     trading on the New York Stock Exchange ("NYSE"). Each fund is open on those
     business days when the NYSE is open. Purchases and sales of fund shares are
     executed at the NAV next determined after the fund receives your order. In
     calculating NAV, securities for which market quotations are available are
     valued at those quotations. Securities for which such quotations are not
     available are valued at fair value under procedures approved by the Board.

     LORD ABBETT DISTRIBUTOR LLC ("Lord Abbett Distributor") acts as agent for
     the funds to work with investment professionals that buy and/or sell shares
     of the funds on behalf of their clients. Generally, Lord Abbett Distributor
     does not sell fund shares directly to investors.

6 Your Investment





<PAGE>

<PAGE>


REDEMPTIONS

     BY BROKER. Call your investment professional for directions on how to
     redeem your shares.

     BY TELEPHONE. To obtain the proceeds of a redemption of $50,000 or less
     from your account, you or your representative can call the fund at
     800-821-5129.

     BY MAIL. Submit a written redemption request indicating, the name(s) in
     which the account is registered, the fund's name, the class of shares, your
     account number, and the dollar value or number of shares you wish to sell.

     Include all necessary signatures. If the signer has any Legal Capacity, the
     signature and capacity must be guaranteed by an Eligible Guarantor. Certain
     other legal documentation may be required. For more information regarding
     proper documentation call 800-821-5129.

     Normally a check will be mailed to the name and address in which the
     account is registered (or otherwise according to your instruction) within
     three business days after receipt of your redemption request. Your account
     balance must be sufficient to cover the amount being redeemed or your
     redemption order will not be processed. Redemption requests for shares
     initially purchased by check will not be honored for up to 15 days, unless
     we are assured that the check has cleared earlier.

DISTRIBUTIONS AND TAXES

     Each fund pays its shareholders dividends from its net investment income,
     and distributes any net capital gains that it has realized. Each fund
     expects to pay income dividends and capital gain distributions, if any,
     once a year, usually in December. Your distributions will be reinvested in
     your fund unless you instruct the fund to pay them to you in cash.

     The tax status of distributions is the same regardless of how long they
     have been in the fund or whether distributions are reinvested or paid in
     cash. In general, distributions are taxable as follows:


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
Federal Taxability Of Distributions
Type of            Tax rate for taxpayer          Tax rate for taxpayer subject
distribution       subject to 15% bracket         to 28% bracket and above
- -------------------------------------------------------------------------------
<S>                <C>                            <C>
INCOME                                            Ordinary
DIVIDENDS          15%                            income rate
- -------------------------------------------------------------------------------
SHORT-TERM                                        Ordinary
CAPITAL GAINS      15%                            income rate
- -------------------------------------------------------------------------------
LONG-TERM
CAPITAL GAINS      10%                            20%
- -------------------------------------------------------------------------------
</TABLE>

     Except in tax-advantaged accounts, any sale or exchange of fund shares may
     be a taxable event.

     SMALL ACCOUNTS. Our Board may authorize closing any account in which there
     are fewer than 25 shares if it is in a fund's best interest to do so.

     IMPORTANT INFORMATION. You may be subject to a $50 penalty under the
     Internal Revenue Code if you do not provide a correct taxpayer identifica-
     tion number (Social Security Number for individuals) or make certain
     required certifications. In addition, we may be required to withhold from
     your account and pay to the U.S. Treasury 31% of any redemption proceeds
     and any dividend or distribution from your account.

     ELIGIBLE GUARANTOR is any broker or bank that is a member of the Medallion
     Stamp Program. Most major securities firms and banks are members of this
     program. A NOTARY PUBLIC IS NOT AN ELIGIBLE GUARANTOR.

     TAXES ON TRANSACTIONS. The chart at left also can provide a "rule of thumb"
     guide for your potential U.S. federal tax liability when selling or
     exchanging fund shares. The second row, "Short-term capital gains," applies
     to fund shares sold within 12 months of purchase. The third row, "Long-term
     capital gains," applies to shares held for more than 12 months.

     Starting January 1, 2001, sales of securities held for more than five years
     will be taxed at special lower rates.


                                                               Your Investment 7





<PAGE>

<PAGE>


     ANNUAL INFORMATION - Information concerning the tax treatment of dividends
     and other distributions will be mailed annually to shareholders. Each fund
     will also provide annually to its shareholders information regarding the
     source of dividends and distributions of capital gains paid by that fund.
     Because everyone's tax situation is unique, you should consult your tax
     adviser regarding the treatment of those distributions under the federal,
     state and local tax rules that apply to you, as well as the tax
     consequences of gains or losses from the redemption or exchange of your
     shares.

SERVICES FOR FUND INVESTORS

AUTOMATIC SERVICES

     We offer the following shareholder services:

     TELEPHONE EXCHANGE PRIVILEGE. Class Y shares may be exchanged without a
     service charge for Class Y shares of any Eligible Fund among the Lord
     Abbett-sponsored funds.

     ACCOUNT STATEMENTS. Shareholders with the same last name and address will
     receive quarterly account statements.

     HOUSEHOLDING. Shareholders with the same last name and address will receive
     a single copy of a prospectus and an annual or semi-annual report, unless
     additional reports are specifically requested in writing to the funds.

     ACCOUNT CHANGES. For any changes you need to make to your account, consult
     your investment professional or call the fund at 800-821-5129. 

     SYSTEMATIC EXCHANGE. You or your investment professional can establish a
     schedule of exchanges between the same classes of any Eligible Fund.

MANAGEMENT

     The funds' investment adviser is Lord, Abbett & Co., 767 Fifth Avenue, New
     York, NY 10153-0203. Founded in 1929, Lord Abbett manages one of the
     nation's oldest mutual fund complexes, with approximately $28 billion in
     more than 35 mutual fund portfolios and other advisory accounts. For more
     information about the services Lord Abbett provides to the funds, see the
     Statement of Additional Information.

     The fund pays Lord Abbett a monthly fee based on average daily net assets
     for each month. For the fiscal year ended November 30,1998, the fee paid to
     Lord Abbett was at an annual rate of .50 of 1% for both the Core Fixed
     Income Fund and the Strategic Core Fixed Income Fund. The fee payable to
     Lord Abbett by each fund will being the year subsequent to commencement of
     operations.

     Lord Abbett uses a team of portfolio managers and analysts acting to manage
     the company's investments. Robert Gerber, Partner of Lord Abbett, Executive
     Vice President of the company and Portfolio Manager of each fund, heads the
     team, the senior members of which include Walter Prahl and Robert Lee. Mr.
     Gerber joined Lord Abbett in 1997 as Director of High Grade Fixed Income.
     Before joining Lord Abbett, Mr. Gerber was a Senior Portfolio Manager of
     Sanford C. Bernstein & Co. for five years. Messrs. Prahl and Lee joined
     Lord Abbett in _ and _, respectively. Before joining Lord Abbett, Mr Prahl
     was ___, since _. Before joining Lord Abbett, Mr. Lee was _, since _.

     Lord Abbett offers a variety of Retirement Plans. Call 800-253-7299 for
     information about:

       Traditional, Rollover, Roth and Education IRAs

       Simple IRAs, SEP-IRAs,401(k) and 403(b) accounts

       Defined Contribution Plans

     TELEPHONE TRANSACTIONS. You have this privilege unless you refuse it in
     writing. For your security, telephone transaction requests are recorded. We
     will take measures to verify the identity of the caller, such as asking for
     your name, account number, social security or taxpayer identification
     number and other relevant information. Each fund will not be liable for
     following instructions communicated by telephone that it reasonably
     believes to be genuine.

     Transactions by telephone may be difficult to implement in times of drastic
     economic or market change.

     Exchanges by telephone should not be used to take advantage of short-term
     swings in the market. Each fund reserves the right to limit or terminate
     this privilege for any shareholder making frequent exchanges or abusing the
     privilege and may revoke the privilege for all shareholders upon 60
     days' written notice.

8 Your Investment






<PAGE>

<PAGE>

For More Information

OTHER INVESTMENT TECHNIQUES

     ADJUSTING INVESTMENT EXPOSURE. Each fund may, but is not required to, use
     various strategies to change its investment exposure to adjust to changing
     security prices, interest rates, currency exchange rates, commodity prices
     and other factors. These strategies may involve buying or selling
     derivative instruments, such as options and futures contracts, stripped
     securities, currency exchange contracts, swap agreements, short sales of
     securities, indexed securities and rights and warrants. The fund may use
     these transactions to change the risk and return characteristics of each
     fund's portfolio. If we judge market conditions incorrectly or use a
     strategy that does not correlate well with the fund's investments, it could
     result in a loss, even if we intended to lessen risk or enhance returns.
     These transactions may involve a small investment of cash compared to the
     magnitude of the risk assumed and could produce disproportionate gains or
     losses. Also, these strategies could result in losses if the counterparty
     to a transaction does not perform as promised.

     DIVERSIFICATION. Each fund is a diversified fund, which means that with
     respect to 3/4 of its total assets, it will not purchase a security if, as
     a result, more than 5% of the fund's total assets would be invested in
     securities of a single issuer or the fund would hold more than 10% of the
     outstanding voting securities of the issuer.

     FOREIGN SECURITIES. These securities are not subject to the same degree of
     regulation and may be more volatile and less liquid than securities traded
     in major U.S. markets. This affects block trading. Foreign portfolio
     securities may trade on days when a fund does not value them. Fund share
     prices could be affected on days an investor cannot purchase or sell
     shares. Other risks include less information on public companies, banks and
     governments; political and social instability; expropriations; higher
     transaction costs; currency fluctuations; nondeductable withholding taxes
     and different accounting and settlement practices.

     ILLIQUID SECURITIES. These securities include those that are not traded on
     the open market or that trade irregularly or in very low volume. They may
     be difficult or impossible to sell at the time and price the fund would
     like. Each underlying fund may invest up to 15% of its assets in illiquid
     securities.

     In addition the use of options and financial futures transactions to
     achieve a funds' investment objective could result in a loss due to
     unanticipated market conditions and could increase the volatility of the
     fund. These transactions may involve a small investment of cash relative to
     the risks assumed.

     PORTFOLIO SECURITIES LENDING. Each fund may lend securities to
     broker-dealers and financial institutions, as a means of earning income.
     This practice could result in a loss or delay in recovering a fund's
     securities, if the borrower defaults. Each fund will limit its securities
     loans to 33 1/3% of its total assets.

     REPURCHASE AGREEMENTS. In a Repurchase Agreement, a fund buys a security at
     one price from a broker-dealer or financial institution and simultaneously
     agrees to sell the same security back to the same party at a higher price
     in the future. If the other party to the agreement defaults or becomes
     insolvent, a fund could lose money.

     WHEN-ISSUED OR DELAYED DELIVERY SECURITIES. Each fund may purchase or sell
     securities with payment and delivery taking place as much as a month or
     more later. A fund


                                                          For More Information 9






<PAGE>

<PAGE>


     would do this in an effort to buy or sell the securities at an advantageous
     price and yield. The securities involved are subject to market fluctuation
     and no interest accrues to the purchaser during the period between purchase
     and settlement. At the time of delivery of the securities, their market
     value may be less than the purchase price. Also, if a fund commits a
     significant amount of assets to when-issued or delayed delivery
     transactions, it may increase the volatility of the fund's net asset value.

     YANKEES. Each fund may invest in the securities of foreign issuers payable
     in U.S. dollars issued inside the U.S. that are included the Lehman
     Brothers Aggregate Bond Index.

GLOSSARY OF SHADED TERMS

     ELIGIBLE FUND. An Eligible Fund is any Lord Abbett-sponsored fund offering
     class Y shares.

     LEGAL CAPACITY. With respect to a redemption request, if (for example) the
     request is on behalf of the estate of a deceased shareholder, John W. Doe,
     by a person (Robert A. Doe) who has the legal capacity to act for the
     estate of the deceased shareholder because he is the executor of the
     estate, then the request must be executed as follows: Robert A. Doe,
     Executor of the Estate of John W. Doe. That signature using that capacity
     must be guaranteed by an Eligible Guarantor.

     Similarly, if (for example) the redemption request is on behalf of the ABC
     Corporation by a person (Mary B. Doe) that has the legal capacity to act on
     behalf of this corporation, because she is the President of the
     corporation, then the request must be executed as follows: ABC Corporation
     by Mary B. Doe, President. That signature using that capacity must be
     guaranteed by an Eligible Guarantor.

     MUTUAL FUND ADVISORY PROGRAM. Certain unaffiliated authorized brokers,
     dealers, registered investment advisers or other financial institutions who
     either (a) have an arrangement with Lord Abbett Distributor in accordance
     with certain standards approved by Lord Abbett Distributor, providing
     specifically for the use of our shares (and sometimes providing for
     acceptance of orders for such shares on our behalf) in particular
     investment products made available for a fee to clients of such brokers,
     dealers, registered investment advisers and other financial institutions,
     or (b) charge an advisory, consulting or other fee for their services and
     buy shares for their own accounts or the accounts of their clients.

RECENT PERFORMANCE

     Because Core Fixed Income Fund and Strategic Core Fixed Income Fund are
     new, information regarding recent performance is not available.


     GUARANTEED SIGNATURE. An acceptable form of guarantee would be as follows:

       In the case of the estate -

       Robert A. Doe
       Executor of the Estate of
       John W. Doe

       [Date]


     SIGNATURE GUARANTEED
     MEDALLION GUARANTEED
     NAME OF GUARANTOR
     /s/ David R. Levy
     --------------------------
     AUTHORIZED SIGNATURE
     (960)       X9003470
     Securities Transfer Agents Medallion Program'TM'
                                                  SR

       In the case of the corporation ABC Corporation

       /s/ Mary B. Doe

       By Mary B. Doe, President

       [Date]

     SIGNATURE GUARANTEED
     MEDALLION GUARANTEED
     NAME OF GUARANTOR
     /s/ David R. Levy
     --------------------------
     AUTHORIZED SIGNATURE
     (960)       X9003470
     Securities Transfer Agents Medallion Program'TM'
                                                  SR

     YEAR 2000 ISSUES. Each fund could be adversely affected if the computers
     used by each fund and their service providers do not properly process and
     calculate date-related information from and after January 1, 2000.

     While year 2000-related computer problems could have a negative effect on
     each fund, Lord Abbett is working to avoid such problems and has assurances
     from each fund's service providers that they are taking similar steps.
     However, because the problem is unprecedented and efforts to identify and
     fix it are on-going, we don't know whether these efforts will be
     successful. Accordingly, each fund may be adversely affected.

10 Financial Information





<PAGE>

<PAGE>

                         Financial Information

                                                         Core Fixed Income Fund

FINANCIAL HIGHLIGHTS

     This table describes the fund's performance for the fiscal periods
     indicated. "Total return" shows how much your investment in the fund would
     have increased (or decreased) during each period, assuming you had
     reinvested all dividends and distributions. These Financial Highlights have
     been audited by Deloitte & Touche LLP, the fund's independent auditors, in
     conjunction with their annual audit of the fund's financial statements.
     Financial statements for the fiscal year ended November 30, 1998 and the
     Independent Auditors' Report thereon appear in the Annual Report to
     Shareholders for the fiscal year ended November 30, 1998 and are
     incorporated by reference into the Statement of Additional Information,
     which is available upon request. Certain information reflects financial
     results for a single fund share.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
                                                       CLASS Y SHARES
                                                -------------------------------
                                                   Year Ended November 30,     
<S>                                             <C>                     <C>    
Per Share Operating Performance:                1998                    1997(a)
NET ASSET VALUE, BEGINNING OF YEAR              $0.00                   $0.00  
- -------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS                                              
- -------------------------------------------------------------------------------
 Net investment income                           0.00                    0.00 
- -------------------------------------------------------------------------------
 Net realized and unrealized
- -------------------------------------------------------------------------------
   gain (loss) on investments                    0.00                    0.00  
- -------------------------------------------------------------------------------
Total from investment operations                 0.00                    0.00  
- -------------------------------------------------------------------------------
DISTRIBUTIONS
- -------------------------------------------------------------------------------
 Dividends from net investment income           (0.00)                  (0.00) 
- -------------------------------------------------------------------------------
 Distributions from net realized gain             --                      --   
- -------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR                    $0.00                   $0.00 
- -------------------------------------------------------------------------------
TOTAL RETURN(b)                                  0.00%                   0.00%
- -------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:                                                  
- -------------------------------------------------------------------------------
 Expenses excluding waiver                       0.00%                   0.00%
- -------------------------------------------------------------------------------
 Net investment income                           0.00%                   0.00%
===============================================================================

<CAPTION>
                                                   Year Ended November 30,
                                                -------------------------------
<S>                                             <C>                     <C>    
SUPPLEMENTAL DATA FOR ALL CLASSES:              1998                    1997   
NET ASSETS, END OF YEAR (000)                  $0,000                  $0,000  
- -------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                         0.00%                   0.00%  
- -------------------------------------------------------------------------------
</TABLE>

(a) From December 10, 1997 commencement of operations.
(b) Total return does not consider the effects of sales loads and assumes the
    reinvestment of all distributions.
(c) Amount less than 0.01%.
(d) Not annualized.

See Notes to Financial Statements.



                                                        Financial Information 11






<PAGE>

<PAGE>


LINE GRAPH COMPARISON

     Immediately below is a comparison of a $10,000 investment in class Y shares
     to the same investment in the Lehman Brothers Aggregate Bond Index,
     assuming reinvestment of all dividends and distributions.
- -------------------------------------------------------------------------------

                                 Awaiting Data

- -------------------------------------------------------------------------------


                Average Annual Total Return At Maximum Applicable
             Sales Charge For The Periods Ending November 30, 1998

<TABLE>
<CAPTION>
                   1 YEAR                  5 YEARS           10 YEARS (OR LIFE)
- -------------------------------------------------------------------------------
<S>                <C>                     <C>                <C>              
Class A(4)          4.40%                   4.66%                  7.65%       
- -------------------------------------------------------------------------------
Class B(5)          4.49%                    --                    7.25%       
- -------------------------------------------------------------------------------
Class C(6)          8.80%                    --                    9.15%       
- -------------------------------------------------------------------------------
</TABLE>
- --------------------------------
(1) Reflects the deduction of the maximum initial sales charge of 4.75%

(2) Performance for the unmanaged Lehman Municipal Bond Index does not
    reflect transaction costs, management fees or sales charges.

(3) Source: Lipper Analytical Services.

(4) This shows total return which is the percent change in value, after
    deduction of the maximum initial sales charge of 4.75% applicable to
    class A shares, with all dividends and distributions reinvested for the
    periods shown ending September 30, 1998 using the SEC-required uniform
    method to compute total return. The class Y share inception date is
    12/10/97.


12 Financial Information






<PAGE>

<PAGE>


===============================================================================



     More information on these funds is available free upon request, including
     the following:

ANNUAL/SEMI-ANNUAL REPORT

     Describes the funds, lists portfolio holdings and contains a letter from
     the fund's manager discussing recent market conditions and each fund's
     investment strategies.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

     Provides more details about the funds and their policies. A current SAI is
     on file with the Securities and Exchange Commission ("SEC") and is
     incorporated by reference (is legally considered part of this prospectus).

     Core Fixed Income Fund
     Strategic Core Fixed Income Fund

     The General Motors Building
     767 Fifth Avenue
     New York, NY 10153-0203
     -------------------------- 
     SEC file number: 811-7988

     To obtain information:

     BY TELEPHONE. Call the funds at:
     800-426-1130

     BY MAIL. Write to the funds at:
     The Lord Abbett Family of Funds
     767 Fifth Avenue
     New York, NY 10153-0203

     VIA THE INTERNET
     LORD ABBETT & CO.
     http://www.lordabbett.com

     Text only versions of fund documents can be viewed online or downloaded
     from:

     SEC
     http://www.sec.gov

     You can also obtain copies by visiting the SEC's Public Reference Room in
     Washington, DC (phone 800-SEC-0330) or by sending your request and a
     duplicating fee to the SEC's Public Reference Section, Washington, DC
     20549-6009.

     LAPROSP-Y-1-499
     (4/99)

===============================================================================






<PAGE>

<PAGE>

LORD ABBETT

STATEMENT OF ADDITIONAL INFORMATION                         APRIL 1, 1999



                          LORD ABBETT INVESTMENT TRUST

                        U.S. GOVERNMENT SECURITIES SERIES
               LIMITED DURATION U.S. GOVERNMENT SECURITIES SERIES
                                 BALANCED SERIES
                                 HIGH YIELD FUND

This Statement of Additional Information is not a Prospectus. A Prospectus may
be obtained from your securities dealer or from Lord Abbett Distributor LLC
("Lord Abbett Distributor") at The General Motors Building, 767 Fifth Avenue,
New York, New York 10153-0203. This Statement relates to, and should be read in
conjunction with, the Prospectus dated April 1, 1999.

Lord Abbett Investment Trust (referred to as the "Company") was organized as a
Delaware business trust on August 16, 1993. The Company's trustees have
authority to create separate classes and funds of shares of beneficial interest,
without further action by shareholders. The Company includes six funds, four of
which are discussed in this Statement of Additional Information: U.S. Government
Securities Fund, Limited Duration U.S. Government Securities Fund, Balanced Fund
and High Yield Fund. The U.S. Government Securities Fund, Balanced Fund and High
Yield Fund each offers four classes of shares: Classes A, Class B, C and P;
Limited Duration U.S.Government Securities Fund offers three : Classes A, C and
P . All shares have equal noncumulative voting rights and equal rights with
respect to dividends, assets and liquidation, except for certain class-specific
expenses. They are fully paid and nonassessable when issued and have no
preemptive or conversion rights. Further classes or funds may be added in the
future. The Investment Company Act of 1940, as amended (the "Act") requires that
where more than one class or fund exists, each class or fund must be preferred
over all other classes or funds in respect of assets specifically allocated to
such class or fund.

Rule 18f-2 under the Act provides that any matter required to be submitted, by
the provisions of the Act or applicable state law or otherwise, to the holders
of the outstanding voting securities of an investment company such as the
Company shall not be deemed to have been effectively acted upon unless approved
by the holders of a majority of the outstanding shares of each class or fund
affected by such matter. Rule 18f-2 further provides that a class or fund shall
be deemed to be affected by a matter unless the interests of each class or fund
in the matter are substantially identical or the matter does not affect any
interest of such class or fund. However, the Rule exempts the selection of
independent public accountants, the approval of principal distributing contracts
and the election of trustees from its separate voting requirements.

Shareholder inquiries should be made by writing directly to the Company or by
calling 800-821-5129. In addition, you can make inquiries through your dealer.

<TABLE>
<CAPTION>

            TABLE OF CONTENTS                                              Page
<S>             <C>                                                        <C>

           1.   Investment Policies........................................  2
           2.   Trustees and Officers......................................  5
           3.   Investment Advisory and Other Services ....................  8
           4.   Portfolio Transactions.....................................  9
           5.   Purchases,  Redemptions  and Shareholder Services.......... 10
           6.   Past Performance........................................... 18
           7.   Taxes...................................................... 19
           8.   Information About the Company.............................. 20
           9.   Financial Statements....................................... 20
           10.  Appendix................................................... 21

</TABLE>







<PAGE>

<PAGE>




                                       1.

                               INVESTMENT POLICIES

FUNDAMENTAL INVESTMENT RESTRICTIONS

We are subject to the following investment restrictions, which cannot be changed
without approval of a majority of our outstanding shares. Each fund may not: (1)
borrow money, except that (i) each fund may borrow from banks (as defined in the
Act) in amounts up to 33 1/3% of its total assets (including the amount
borrowed), (ii) each fund may borrow up to an additional 5% of its total assets
for temporary purposes, (iii) each fund may obtain such short-term credit as may
be necessary for the clearance of purchases and sales of portfolio securities
and (iv) each fund may purchase securities on margin to the extent permitted by
applicable law; (2) pledge its assets (other than to secure borrowings, or to
the extent permitted by the fund's investment policies as permitted by
applicable law); (3) engage in the underwriting of securities, except pursuant
to a merger or acquisition or to the extent that, in connection with the
disposition of its portfolio securities, it may be deemed to be an underwriter
under federal securities laws; (4) make loans to other persons, except that the
acquisition of bonds, debentures or other corporate debt securities and
investment in government obligations, commercial paper, pass-through
instruments, certificates of deposit, bankers acceptances, repurchase agreements
or any similar instruments shall not be subject to this limitation, and except
further that each fund may lend its portfolio securities, provided that the
lending of portfolio securities may be made only in accordance with applicable
law; (5) buy or sell real estate (except that each fund may invest in securities
directly or indirectly secured by real estate or interests therein or issued by
companies which invest in real estate or interests therein) or commodities or
commodity contracts (except to the extent each fund may do so in accordance with
applicable law and without registering as a commodity pool operator under the
Commodity Exchange Act as, for example, with futures contracts)); (6) with
respect to 75% of its gross assets, buy securities of one issuer representing
more than (i) 5% of the its gross assets, except securities issued or guaranteed
by the U.S. government, its agencies or instrumentalities, and for the Balanced
Fund, securities issued by an investment company or (ii) 10% of the voting
securities of such issuer; (7) invest more than 25% of its assets, taken at
market value, in the securities of issuers in any particular industry (excluding
securities of the U.S. government, its agencies and instrumentalities); (8)
issue senior securities to the extent such issuance would violate applicable law
or (9) (with respect to the U.S. Government Securities Fund only) invest in
securities other than U.S. government securities, as described in the
Prospectus.

Compliance with these restrictions will be determined at the time of purchase or
sale of such securities and will not be affected by changes in the market value
of portfolio securities

NON-FUNDAMENTAL INVESTMENT RESTRICTIONS

Each fund also is subject to the policies described in the Prospectus and the
following investment policies which may be changed by the Board of Trustees
without shareholder approval. Each fund may not: (1) borrow in excess of 33 1/3
% of its total assets (including the amount borrowed), and then only as a
temporary measure for extraordinary or emergency purposes; (2) make short sales
of securities or maintain a short position except to the extent permitted by
applicable law; (3) invest knowingly more than 15% of its net assets (at the
time of investment) in illiquid securities, except for securities qualifying for
resale under Rule 144A of the Securities Act of 1933, deemed to be liquid by the
Board of Trustees; (4) invest in the securities of other investment companies
except as permitted by applicable law; (5) invest in securities of issuers
which, with their predecessors, have a record of less than three years'
continuous operations, if more than 5% of the fund's' total assets would be
invested in such securities (this restriction shall not apply to mortgage-backed
securities, asset-backed securities or obligations issued or guaranteed by the
U.S. government, its agencies or instrumentalities); (6) hold securities of any
issuer if more than 1/2 of 1% of the securities of such issuer are owned
beneficially by one or more officers or trustees of the fund or by one or more
partners or members of the Company's underwriter or investment adviser if these
owners in the aggregate own beneficially more than 5% of the securities of such
issuer; (7) invest in warrants if, at the time of the acquisition, its
investment in warrants, valued at the lower of cost or market, would exceed 5%
of the Series'fund's total assets (included within such limitation, but not to
exceed 2% of the funds' total assets, are warrants which are not listed on the
New York or American Stock Exchange or a major foreign exchange); (8) invest in
real estate limited partnership interests or interests in oil, gas or other
mineral leases, or exploration or other development programs, except that each
fund may invest in securities issued by companies that engage in oil, gas or
other mineral exploration or other development activities; (9) write, purchase
or sell puts, calls, straddles, spreads or combinations thereof, except to the
extent permitted in the fund's prospectus and statement of additional
information, as they may be amended from time to time; or (10) buy from or sell
to any of its officers,





                                       2






<PAGE>

<PAGE>

trustees, employees, or its investment adviser or any of its officers, trustees,
partners or employees, any securities other than shares of beneficial interest
in such fund.

Although there is no current intention to do so, each fund may invest in
financial futures and options on financial futures.

INVESTMENT TECHNIQUES

LENDING PORTFOLIO SECURITIES

Each fund may lend portfolio securities to registered brokers-dealers. These
loans, if and when made, may not exceed 30% of the fund's total assets. The
fund's loans of securities will be collateralized by cash or marketable
securities issued or guaranteed by the U.S. government or its agencies ("U.S.
government securities") or other permissible means in an amount at least equal
to the market value of the loaned securities. From time to time, each fund may
pay a part of the interest received with respect to the investment of collateral
to the borrower and/or a third party that is not affiliated with the fund and is
acting as a "placing broker." No fee will be paid to affiliated persons of the
Company.

By lending portfolio securities, each fund can increase its income by continuing
to receive income on the loaned securities as well as by either investing the
cash collateral in permissible investments, such as U.S. government securities,
or obtaining yield in the form of interest paid by the borrower when such U.S.
government securities or other forms of non-cash collateral are used as
security. Each fund will comply with the following conditions whenever it loans
securities: (i) the fund must receive at least 100% collateral from the
borrower; (ii) the borrower must increase the collateral whenever the market
value of the securities loaned rises above the level of the collateral; (iii)
the fund must be able to terminate the loan at any time; (iv) the fund must
receive reasonable compensation with respect to the loan, as well as any
dividends, interest or other distributions on the loaned securities; (v) the
fund may pay only reasonable fees in connection with the loan; and (vi) voting
rights on the loaned securities may pass to the borrower except that, if the
Fund has knowledge of a material event adversely affecting the investment in the
loaned securities, the fund must terminate the loan and regain the right to vote
the securities.

REPURCHASE AGREEMENTS

Each fund (except, High Yield Fund) may enter into repurchase agreements with
respect to a security. A repurchase agreement is a transaction by which the fund
acquires a security and simultaneously commits to resell that security to the
seller (a bank or securities dealer), and the seller commits to repurchase that
security, at an agreed upon price on an agreed upon date. The resale price
reflects the purchase price plus an agreed upon market rate of interest which is
unrelated to the coupon rate or date of maturity of the purchased security. (In
this type of transaction, the securities purchased by the fund have a total
value in excess of the value of the repurchase agreement.) Each fund requires at
all times that the repurchase agreement be collateralized by cash or U.S.
Government securities having a value equal to, or in excess of, the value of the
repurchase agreement. Such agreements permit the fund to keep all of its assets
at work while retaining flexibility in pursuit of investments of a longer term
nature.

The use of repurchase agreements involves certain risks. For example, if the
seller of the agreement defaults on its obligation to provide additional
collateral or to repurchase the underlying securities at a time when the value
of these securities has declined, the fund may incur a loss upon disposition of
them. If the seller of the agreement becomes insolvent and subject to
liquidation or reorganization under the Bankruptcy Code or other laws, a
bankruptcy court may determine that the underlying securities are collateral not
within the control of the fund and are therefore subject to sale by the trustee
in bankruptcy. Even though the repurchase agreements may have maturities of
seven days or less, they may lack liquidity, especially if the issuer encounters
financial difficulties. While management acknowledges these risks, it is
expected that they can be controlled through stringent selection criteria and
careful monitoring procedures. Mmanagement intends to limit repurchase
agreements for each fund to transactions with dealers and financial institutions
believed by management to present minimal credit risks. Management will monitor
creditworthiness of the repurchase agreement sellers on an ongoing basis.

Each fund will enter into repurchase agreements only with those primary
reporting dealers that report to the Federal Reserve Bank of New York and with
the 100 largest United States commercial banks and the underlying securities
purchased under the agreements will consist only of those securities in which
the fund otherwise may invest.




                                       3






<PAGE>

<PAGE>

WHEN-ISSUED TRANSACTIONS (applicable to High Yield?)

As stated in the Prospectus, each fund may purchase portfolio securities on a
when-issued basis. When-issued transactions involve a commitment by the fund to
purchase securities, with payment and delivery ("settlement") to take place in
the future, in order to secure what is considered to be an advantageous price or
yield at the time of entering into the transaction. The value of fixed-income
securities to be delivered in the future will fluctuate as interest rates vary.
During the period between purchase and settlement, the value of the securities
will fluctuate and assets consisting of cash and/or marketable securities
(normally short-term U.S. Government securities) marked to market daily in an
amount sufficient to make payment at settlement will be segregated at our
custodian in order to pay for the commitment. There is a risk that market yields
available at settlement may be higher than yields obtained on the purchase date
which could result in depreciation of value of fixed-income when-issued
securities. At the time each fund makes the commitment to purchase a security on
a when-issued basis, it will record the transaction and reflect the liability
for the purchase and the value of the security in determining its net asset
value. Each fund, generally, has the ability to close out a purchase obligation
on or before the settlement date rather than take delivery of the security.
Under no circumstance will settlement for such securities take place more than
120 days after the purchase date.

AVERAGE DURATION

The Limited Duration Government fund limits its average dollar weighted
portfolio duration to a range of one to four years. However, many of the
securities in which the fund invests will have remaining durations in excess of
four years.

Some of the securities in the Limited Duration Government Funds' portfolio
may have periodic interest rate adjustments based upon an index such as the
91-day Treasury Bill rate. This periodic interest rate adjustment tends to
lessen the volatility of the security's price. With respect to securities with
an interest rate adjustment period of one year or less, the Limited Duration
Government Fund will, when determining average-weighted duration, treat such a
security's maturity as the amount of time remaining until the next interest rate
adjustment.

Instruments such as GNMA, FNMA, FHLMC securities and similar securities backed
by amortizing loans generally have shorter effective maturities than their
stated maturities. This is due to changes in amortization caused by demographic
and economic forces such as interest rate movements. These effective maturities
are calculated based upon historical payment patterns and therefore have shorter
duration than would be implied by their stated final maturity. For purposes of
determining the Limited Duration Government fund's average maturity, the
maturities of such securities will be calculated based upon the issuing agency's
payment factors using industry-accepted valuation models.

PORTFOLIO TURNOVER

For the fiscal year ended November 30, 1998, the portfolio turnover rate for the
U.S. Government Securities Fund was       % as compared to 712.82% for the
previous year;        % for the Limited Duration Government Fund compared to
343.53% for the year ended November 30, 1997      %;       % for the Balanced
Fund as compared to 216.07% for the year ended ended November 30, 1997.

As discussed above, each fund may purchase U.S. government securities on a
when-issued basis with settlement taking place after the purchase date (without
amortizing any premiums). This investment technique is expected to contribute
significantly to portfolio turnover rates. However, it will have little or no
transaction cost or adverse tax consequences. Transaction costs normally will
exclude brokerage because each fund's fixed-income portfolio transactions are
usually on a principal basis and any markups charged normally will be more than
offset by the beneficial economic consequences anticipated at the time of
purchase or no purchase will be made. Generally, short-term losses on short-term
U.S. government securities purchased under this investment technique tend to
offset any short-term gains due to such high portfolio turnover.



                                       4








<PAGE>

<PAGE>



                                       2.

                              TRUSTEES AND OFFICERS

The following Trustee is a partner of Lord, Abbett & Co. ("Lord Abbett"), The
General Motors Building, 767 Fifth Avenue, New York, New York 10153-0203. He has
been associated with Lord Abbett for over five years and is also an officer,
director or trustee of the other Lord Abbett-sponsored funds. He is an
"interested person" as defined in the Act, and as such, may be considered to
have an indirect financial interest in the Rule 12b-1 Plan described in the
Prospectus.

Robert S. Dow, age 54, Chairman and President

The following outside trustees are also directors or trustees of the other Lord
Abbett-sponsored funds.

E. Thayer Bigelow
Time Warner Inc.
1271 Avenue of the Americas
New York, New York

Senior Adviser, Time Warner Inc. Formerly, Acting Chief Executive Officer of
Courtroom Television Network (1997-1998). Formerly, President and Chief
Executive Officer of Time Warner Cable Programming, Inc. (1991-1997). Prior to
that, President and Chief Operating Officer of Home Box Office, Inc. Age 57.

William H.T. Bush
Bush-O'Donnell & Co., Inc.
101 South Hanley Road, Suite 1025
St. Louis, Missouri

Co-founder and Chairman of the Board of the financial advisory firm of
Bush-O'Donnell & Company. Age 60.

Robert B. Calhoun, Jr.
Monitor Clipper Partners
650 Madison Avenue, 9th Floor
New York, New York

Managing Director of Monitor Clipper Partners and President of the Clipper Group
L.P., both private equity investment funds. Age 56.

Stewart S. Dixon
Wildman, Harrold, Allen & Dixon
225 W. Wacker Drive (Suite 2800)
Chicago, Illinois

Partner in the law firm of Wildman, Harrold, Allen & Dixon. Age 68.

John C. Jansing
162 S. Beach Road
Hobe Sound, Florida

Retired. Former Chairman of Independent Election Corporation of America, a proxy
tabulating firm. Age 73.

C. Alan MacDonald
Directorship Inc.
8 Sound Shore Drive
Greenwich, Connecticut







                                       5






<PAGE>

<PAGE>

Managing Director of Directorship Inc., a consultancy in board management and
corporate governance. Formerly General Partner of The Marketing Partnership,
Inc., a full service marketing consulting firm (1994-1997). Prior to that,
Chairman and Chief Executive Officer of Lincoln Snacks, Inc., manufacturer of
branded snack foods (1992-1994). His career spans 36 years at Stouffers and
Nestle with eighteen of the years as Chief Executive Officer. Currently serves
as Director of DenAmerica Corp., J. B. Williams Company, Inc., Fountainhead
Water Company and Exigent Diagnostics. Age 65.

Hansel B. Millican, Jr.
Rochester Button Company
1328 Broadway (Suite 816)
New York, New York

President and Chief Executive Officer of Rochester Button Company. Age 70.

Thomas J. Neff
Spencer Stuart
277 Park Avenue
New York, New York

Chairman of Spencer Stuart, an executive search consulting firm. Currently
serves as Director of Ace, Ltd. (NYSE). Age 61.

The second column of the following table sets forth the compensation accrued for
the fund's outside trustees. The third and fourth columns set forth information
with respect to the equity-based benefits accrued for outside directors/trustees
maintained by the Lord Abbett-sponsored funds. The fourth column sets forth the
total compensation payable by such funds to the outside trustees. No trustees of
the fund associated with Lord Abbett and no officer of the fund received any
compensation from the fund for acting as a trustee or officer.

<TABLE>
<CAPTION>

                                 For the Fiscal Year Ended November 30, 1998
                                 -------------------------------------------
       (1)                        (2)                           (3)                            (4)

                                                            Pension or                    For Year Ended
                                                            Retirement Benefits           December 31, 1998
                                                            Accrued by the                Total Compensation
                              Aggregate                     Company and                   Accrued by the Company and
                              Compensation                  All Other Lord                All Other Lord
                              Accrued by                    Abbett-sponsored              Abbett-sponsored
Name of Board Member          the Companies(1)              Companies(2)                  Companies(3)
- -------------------------     ----------------              ------------                  ------------

<S>                           <C>                           <C>                           <C>
E. Thayer Bigelow             $                             $17,068                       $56,000
William H. T. Bush*           $                             $none                         $none
Robert B. Calhoun, Jr.**      $                             $none                         $none
Stewart S. Dixon              $                             $32,190                       $55,000
John C. Jansing               $                             $45,085(4)                    $55,000
C. Alan MacDonald             $                             $30,703                       $57,400
Hansel B. Millican, Jr.       $                             $37,747                       $55,000
Thomas J. Neff                $                             $19,853                       $56,000
</TABLE>

 *Elected as of August 13, 1998.
**Elected as of June 17, 1998.

1. Outside trustees' fees, including attendance fees for board and committee
   meetings, are allocated among all Lord Abbett-sponsored funds based on the
   net assets of each fund. A portion of the fees payable by the fund to its
   outside directors/trustees is being deferred under a plan that deems the
   deferred amounts to be invested in shares of the fund for later distribution
   to the directors/trustees.





                                       6






<PAGE>

<PAGE>

2. The amounts in Column 3 were accrued by the Lord Abbett-Sponsored funds for
   the twelve months ended November 30, 1998 with respect to the equity based
   plans established for independent directors in 1996. This plan supercedes a
   previously approved retirement plan for all future directors. Current
   directors had the option to convert their accrued benefits under the
   retirement plan. All of the outside directors except one made such an
   election.

3. This column shows aggregate compensation, including directors fees and
   attendance fees for board and committee meetings, of a nature referred to in
   footnote one, accrued by the Lord Abbett-sponsored funds during the year
   ended December 31, 1998 The amounts of the aggregate compensation payable by
   the fund as of November 30, 1998 deemed invested in fund shares, including
   dividends reinvested and changes in net asset value applicable to such deemed
   investments, were: Mr. Bigelow, $      ; Mr. Dixon, $      ; Mr. Jansing,
   $      ; Mr. MacDonald, $      ; Mr. Millican, $      and Mr. Neff,       .
   If the amounts deemed invested in fund shares were added to each director's
   actual holdings of fund shares as of November 30, 1998, each would own, the
   following: Mr. Bigelow,        shares; Mr. Dixon,         shares; Mr.
   Jansing,        shares; Mr. McDonald,        shares; Mr. Millican,        
   shares; and Mr. Neff,        shares.

4. Mr. Jansing chose to continue to receive benefits under the retirement plan
   which provides that outside directors (Trustees) may receive annual
   retirement benefits for life equal to their final annual retainer following
   retirement at or after age 72 with at least ten years of service. Thus, if
   Mr. Jansing were to retire and the annual retainer payable by the funds were
   the same as it is today, he would receive annual retirement benefits of
   $50,000.

Except where indicated, the following executive officers of the Company have
been associated with Lord Abbett for over five years. Of the following, Messrs.
Brown, Carper, Gerber, Hilstad, Hudson , Morris and Towle are partners of Lord
Abbett; the others are employees.

EXECUTIVE VICE PRESIDENTS:

Christopher J. Towle, age 41 (with Lord Abbett since 1988 and has over 17 years
of investment experience)

Robert Gerber, age 44 (with Lord Abbett since 1997, formerly Senior Portfolio
manager at Sanford C. Bernstein & Co. from 1992-1997)

Robert G. Morris, age 54

VICE PRESIDENTS:

Paul A. Hilstad, age 56, Vice President and Secretary (with Lord Abbett since
1995; formerly Senior Vice President and General Counsel of American Capital
Management & Research, Inc.)

Zane E. Brown, age 47

Daniel E. Carper, age 47

W. Thomas Hudson, age 57

Lawrence H. Kaplan, age 42 (with Lord Abbett since 1997 formerly Vice President
and Chief Counsel of Salomon Brothers Asset Management Inc from 1995 to 1997,
prior thereto Senior Vice President, Director and General Counsel of Kidder
Peabody Asset Management, Inc.)

Thomas F. Konop, age 56

Robert A. Lee, age 29 (with Lord Abbett since 1997, formerly Portfolio Manager
at Arm Capital Advisors from 1995-1997; prior thereto Assistant Portfolio
Manager at Kidder Peabody Asset Management from 1993-1995)

A.Edward Oberhaus III, age 39

Keith F. O'Connor, age 43






                                       7








<PAGE>

<PAGE>

Walter H. Prahl, age 40 (with Lord Abbett since 1997, formerly Quantitative
Analyst at Sanford C. Bernstein & Co. from 1994-1997)

TREASURER:

Donna M. McManus, age 38 (with Lord Abbett since 1996, formerly a Senior Manager
at Deloitte & Touche LLP).

The Company does not hold annual meetings of shareholders unless one or more
matters are required to be acted on by shareholders under the Act. Under the
Company's Declaration of Trust, shareholder meetings may be called at any time
by certain officers of the Company or by a majority of the trustees (I) for the
purpose of taking action upon any matter requiring the vote or authority of the
Company's shareholders or upon other matters deemed to be necessary or desirable
or (ii) upon the written request of the holders of at least one-quarter of the
shares of the fund outstanding and entitled to vote at the meeting.

As of            , 1999 our officers and directors, as a group, owned less than
1% of our outstanding shares. As of          , 1999 there were no record holders
of 5% or more of the fund's outstanding shares.



                                       3.

                     INVESTMENT ADVISORY AND OTHER SERVICES


The services performed by Lord Abbett are described under "Management" in the
Prospectus. Under each Management Agreement, we are obligated to pay Lord Abbett
a monthly fee, based on average daily net assets for each month, at the annual
rate of .50 of 1% (in the case of the U.S. Government Securities Fund and the
Limited Duration U.S. Government Securities Fund), .75 of 1% (in the case of the
Balanced Fund) and .60 of 1% (in the case of the High Yield Fund). These fees
are allocated among the classes of each fund based on the class' proportionate
share of each fund's average daily net assets.

Each fund pays all of its expenses not expressly assumed by Lord Abbett,
including, without limitation, 12b-1 expenses, outside trustees' fees and
expenses, association membership dues, legal and audit fees, taxes, transfer and
dividend disbursing agent fees, shareholder servicing costs, expenses relating
to shareholder meetings, expenses of preparing, printing and mailing share
certificates and shareholder reports, expenses of registering our shares under
federal and state securities laws, expenses of preparing, printing and mailing
prospectuses to existing shareholders, insurance premiums and brokerage and
other expenses connected with executing portfolio transactions.

LIMITED DURATION U.S. GOVERNMENT SECURITIES FUND
The management fees paid to Lord Abbett by the Limited Duration U.S. Government
Fund for the fiscal years ended October 31, 1996, November 30, 1997, and
November 30, 1998 amounted to $9,897,$2,770, and $           , respectively. For
the one month period ended November 30, 1996 the management fee paid to Lord
Abbett by the Limited Duration U.S. Government Fund was $2,770. For the fiscal
year ended October 31, 1996, the one month period ended November 30, 1996, the
fiscal years ended November 30, 1997 and November 30, 1998, Lord Abbett waived
$28,804, $2,657, $54,884, and $          in management fees for the Limited
Duration U.S. Government Fund.

BALANCED FUND
The management fees paid to Lord Abbett by the Balanced Fund for the
fiscal years ended October 31, 1996, November 30, 1997, and November 30, 1998
were $8,607, $48,151, and $-------- respectively. For the one month period ended
November 30, 1996, the management fee paid to Lord Abbett by the Balanced Fund
was $2,240. With respect to the Balanced Fund, for the fiscal year ended October
31, 1996, the one month period ended November 30, 1996, the fiscal years ended
November 30, 1997 and November 30, 1998, Lord Abbett waived $53,375, $4,638,
$65,087, and $       in management fees.

U.S. GOVERNMENT SECURITIES FUND
The management fees paid to Lord Abbett by the U.S. Government Securities Fund
for the fiscal years ended October 31, 1996, November 30, 1997 and November 30,
1998 were $15,053,629, $12,500,454, and $         , respectively. For the one
month period ended November 30, 1996, the management fee paid to Lord Abbett by
the U.S. Government Securities Fund was $          .





                                       8







<PAGE>

<PAGE>

Deloitte & Touche LLP, Two World Financial Center, New York, New York 10281, are
the independent auditors of each fund and must be approved at least annually by
our trustees to continue in such capacity. Deloitte & Touche LLP perform audit
services for each fund, including the examination of financial statements
included in our annual report to shareholders.

Bank of New York, 40 Wall Street, New York, New York, is the Company's
custodian.

                                       4.

                             PORTFOLIO TRANSACTIONS

Each fund expects that purchases and sales of portfolio securities usually will
be principal transactions and normally such securities will be purchased
directly from the issuer or from an underwriter or market maker for the
securities. Therefore, each fund usually will pay no brokerage commissions for
such purchases. Purchases from underwriters of portfolio securities will include
a commission or concession paid by the issuer to the underwriter and purchases
from dealers serving as market makers will include a dealer's markup. Principal
transactions, including riskless principal transactions, are not afforded the
protection of the safe harbor in Section 28 (e) of the Securities Exchange Act
of 1934.

Each fund's policy is to have purchases and sales of portfolio securities
executed at most favorable prices, considering all costs of the transaction
including brokerage commissions and dealer markups and markdowns, consistent
with obtaining best execution, except to the extent that we may pay a higher
commission rate as described below. This policy governs the selection of brokers
or dealers and the market in which the transaction is executed. To the extent
permitted by law, we may, if considered advantageous, make a purchase from or
sale to another Lord Abbett-sponsored fund without the intervention of any
dealer.

Broker-dealers are selected on the basis of their professional capability and
the value and quality of their brokerage and research services. Normally, the
selection is made by traders who are officers of the Company and also are
employees of Lord Abbett. These traders do the trading as well for other
accounts -- investment companies (of which they are also officers) and other
investment clients -- managed by Lord Abbett. They are responsible for the
negotiation of prices and any commissions.

We may pay a brokerage commission on the purchase or sale of a security that
could be purchased from or sold to a market maker if our net cost of the
purchase or the net proceeds to us of the sale are at least as favorable as we
could obtain on a direct purchase or sale. Brokers who receive such commissions
may also provide research services at least some of which are useful to Lord
Abbett in their overall responsibilities with respect to us and the other
accounts they manage. Research includes trading equipment and computer software
packages, acquired from third-party suppliers, that enable Lord Abbett to access
various information bases and may include the furnishing of analyses and reports
concerning issuers, industries, securities, economic factors and trends,
portfolio strategy and the performance of accounts. Such services may be used by
Lord Abbett in servicing all their accounts, and not all of such services will
necessarily be used by Lord Abbett in connection with their management of a
fund; conversely, such services furnished in connection with brokerage on other
accounts managed by Lord Abbett may be used in connection with their management
a fund, and not all of such services will necessarily be used by Lord Abbett in
connection with their advisory services to such other accounts. We have been
advised by Lord Abbett that research services received from brokers cannot be
allocated to any particular account, are not a substitute for Lord Abbett's
services but are supplemental to their own research effort and, when utilized,
are subject to internal analysis before being incorporated by Lord Abbett into
their investment process. As a practical matter, it would not be possible for
Lord Abbett to generate all of the information presently provided by brokers.
While receipt of research services from brokerage firms has not reduced Lord
Abbett's normal research activities, the expenses of Lord Abbett could be
materially increased if it attempted to generate such additional information
through its own staff and purchased such equipment and software packages
directly from the suppliers.

No commitments are made regarding the allocation of brokerage business to or
among brokers, and trades are executed only when they are dictated by investment
decisions of the fund to purchase or sell portfolio securities.

If two or more broker-dealers are considered capable of offering the equivalent
likelihood of best execution, the broker-dealer who has sold our shares and/or
shares of other Lord Abbett-sponsored funds may be preferred.




                                       9







<PAGE>

<PAGE>

If other clients of Lord Abbett buy or sell the same security at the same time
as we do, transactions will, to the extent practicable, be allocated among all
participating accounts in proportion to the amount of each order and will be
executed daily until filled so that each account shares the average price and
commission cost of each day. Other clients who direct that their brokerage
business be placed with specific brokers or who invest through wrap accounts
introduced to Lord Abbett by certain brokers may not participate with us in the
buying and selling of the same securities as described above. If these clients
wish to buy or sell the same security as we do, they may have their transactions
executed at times different from our transactions and thus may not receive the
same price or incur the same commission cost as we do.

We will not seek "reciprocal" dealer business (for the purpose of applying
commissions in whole or in part for our benefit or otherwise) from dealers as
consideration for the direction to them of portfolio business.

During the fiscal year ended November 30, 1998, the Limited Duration U.S.
Government Securities Fund, U.S. Government Securities Fund and the High Yield
Fund paid no commissions to independent brokers. For the fiscal year ended
November 30, 1998, the Balanced Fund paid total commissions to independent
brokers of $        .

                                       5.

                             PURCHASES, REDEMPTIONS
                            AND SHAREHOLDER SERVICES

Securities in each fund's portfolio are valued at their market values as of the
close of the New York Stock Exchange ("NYSE"). Market value will be determined
as follows: securities listed or admitted to trading privileges on any national
securities exchange are valued at the last sales price on the principal
securities exchange on which such securities are traded or, if there is no sale,
at the mean between the last bid and asked prices on such exchange or, in the
case of bonds, in the over-the-counter market if, in the judgment of the
Company's officers, that market more accurately reflects the market value
of the bonds. Securities traded only in the over-the-counter market are valued
at the mean between the bid and asked prices, except that securities admitted to
trading on the NASDAQ National Market System are valued at the last sales price.
Securities for which market quotations are not available are valued at fair
value under procedures approved by the Board of Trustees. With respect to the
Balanced Fund, all assets and liabilities expressed in foreign currencies will
be converted into United States dollars at the mean between the buying and
selling rates of such currencies against United States dollars last quoted by
any major bank. If such quotations are not available, the rate of exchange will
be determined in accordance with policies established by the Board of Trustees
of the Company. The Board of Trustees will monitor, on an ongoing basis, the
Company's method of valuation.

Information concerning how we value our shares for the purchase and redemption
of our shares is described in the Prospectus under "Purchases."

As disclosed in the Prospectus, we calculate our net asset value and are
otherwise open for business on each day that the NYSE is open for trading. The
NYSE is closed on Saturdays and Sundays and the following holidays -New Year's
Day, Martin Luther King, Jr. Day, Presidents' Day, Good Friday, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas.

The net asset value per share for the Class B and Class C shares will be
determined in the same manner as for the Class A shares (net assets divided by
shares outstanding). Our Class B and Class C shares will be sold at net asset
value.

The offering price of Class A shares of the U. S. Government Securities Fund,
the Limited Duration U.S. Government Fund, the Balanced Fund and the High Yield
Fund on November 30, 1998 were computed as follows:

<TABLE>
<CAPTION>


                                                                                                    U.S.
                                                Limited Duration                                    Government
                                                Government                 Balanced                 Securities
                                                Fund                       Fund                     Fund
                                                ----------------           --------                 ----------

<S>                                             <C>                        <C>                      <C>

Net asset value per share (net assets divided
  by shares outstanding)........                  $4.40                    $12.80                   $2.59

Maximum offering price per share - net asset

</TABLE>






                                       10






<PAGE>

<PAGE>

<TABLE>


<S>                                             <C>                        <C>                      <C>
 value divided by (.9700 for Limited
  Duration Government Fund
   and U. S. Government Securities Fund)
   and (.9525 for Balanced Fund and High
   Yield Fund)                                 $4.54                       $13.44                   $2.72

</TABLE>

The Company has entered into a distribution agreement with Lord Abbett
Distributor LLC, a New York limited liability company ("Lord Abbett
Distributor"), under which Lord Abbett Distributor is obligated to use its best
efforts to find purchasers for the shares of the fund, and to make reasonable
efforts to sell fund shares so long as, in Lord Abbett Distributor's judgment, a
substantial distribution can be obtained by reasonable efforts.

Since commencement of operations, Lord Abbett as our principal underwriter
received net commissions after allowance of a portion of the sales charge to
independent dealers with respect to Class A shares of the Limited Duration U.S.
Government Securities Fund and the Balanced Fund as follows:

<TABLE>
<CAPTION>

                         Yr Ended           Month Ended       Yr Ended        Yr Ended
                         10/31/96           11/30/96          11/30/97        11/30/98
                         --------           --------          --------        --------
<S>                      <C>                <C>               <C>             <C>

Gross sales charge       $140,941            $8,059           $269,184         $

Amount allowed
to dealers               $123,303            $7,068          $233,663          $
                         --------         ---------          --------

Net Commissions received
by Lord  Abbett          $ 17,638            $ 991           $ 35,521          $
                         ========         ========           ========

</TABLE>


For the fiscal years ended , 1996 , 1997, and 1998, Lord Abbett as principal
underwriter received net commissions after allowance of a portion of the sales
charge to independent dealers with respect to Class A shares of the Acquired
Fund (and subsequent to July 12, 1996, the U.S. Government Securities Fund) as
follows:

<TABLE>
<CAPTION>
                                1996           1997           1998
                                ----           ----           ----

<S>                             <C>            <C>       
Gross sales charge              $4,248,800     $1,469,770

Amount allowed
to dealers                      $3,623,071     $1,259,215
                                ----------     ----------

Net Commissions received
by Lord Abbett                  $625,729       $210,555
                                ========       ========

</TABLE>

CONVERSION OF CLASS B SHARES. The conversion of Class B shares of the U.S.
Government Securities Fund and the High Yield Fund on the eighth anniversary of
their purchase is subject to the continuing availability of a private letter
ruling from the Internal Revenue Service or an opinion of counsel to the effect
that the conversion of Class B shares does not constitute a taxable event for
the holder under Federal income tax law. If such a revenue ruling or opinion is
no longer available, the automatic conversion feature may be suspended, in which
event no further conversions of Class B shares would occur while such suspension
remained in effect. Although Class B shares could then be exchanged for Class A
shares on the basis of relative net asset value of the two classes, without the
imposition of a sales charge or fee, such exchange could constitute a taxable
event for the holder.

ALTERNATIVE SALES ARRANGEMENTS

CLASSES OF SHARES. This Prospectus offers four classes designed Class A, B, C
and P. The different classes of shares represent investments in the same
portfolio of securities but are subject to different expenses and will likely
have different share prices. Investors should read this section carefully to
determine which class represents the best investment option for their particular
situation.

CLASS A SHARES. If you buy Class A shares, you pay an initial sales charge on
investments of less than $1 million (or on investments for employer-sponsored
retirement plans under the Internal Revenue Code (hereinafter referred to as




                                       11







<PAGE>

<PAGE>

"Retirement Plans") with less than 100 eligible employees or on investments that
do not qualify to be under a "special retirement wrap program" as a program
sponsored by an authorized institution showing one or more characteristics
distinguishing it, in the opinion of Lord Abbett Distributor from a mutual fund
wrap fee program). If you purchase Class A shares as part of an investment of at
least $1 million (or for Retirement Plans with at least 100 eligible employees
or under a special retirement wrap program) in shares of one or more Lord
Abbett-sponsored funds, you will not pay an initial sales charge, but if you
redeem any of those shares within 24 months after the month in which you buy
them, you may pay to the Company a contingent deferred sales charge ("CDSC") of
1% except for redemptions under a special retirement wrap program. Class A
shares are subject to service and distribution fees that are currently estimated
to total annually approximately 0.23 of 1% of the annual net asset value of the
Class A shares. The initial sales charge rates, the CDSC and the Rule 12b-1 plan
applicable to the Class A shares are described in "Buying Class A Shares" below.

CLASS B SHARES. If you buy Class B shares, you pay no sales charge at the time
of purchase, but if you redeem your shares before the sixth anniversary of
buying them, you will normally pay a CDSC to Lord Abbett Distributor LLC ("Lord
Abbett Distributor"). That CDSC varies depending on how long you own shares.
Class B shares are subject to service and distribution fees at an annual rate of
1% of the annual net asset value of the Class B shares. The CDSC and the Rule
12b-1 plan applicable to the Class B shares are described in "Buying Class B
Shares" below.

CLASS C SHARES. If you buy Class C shares, you pay no sales charge at the time
of purchase, but if you redeem your shares before the first anniversary of
buying them, you will normally pay the Company a CDSC of 1%. Class C shares are
subject to service and distribution fees at an annual rate of 1% of the annual
net asset value of the Class C shares. The CDSC and the Rule 12b-1 plan
applicable to the C shares are described in "Buying Class C Shares" below.

CLASS P SHARES. If you buy Class P shares, you pay no sales charge at the time
of purchase, and if you redeem your shares you pay no CDSC. Class P shares are
subject to service and distribution fees at an annual rate of .45 of 1% of the
average daily net asset value of the Class P shares. The Rule 12b-1 plan
applicable to the Class P shares is described in "Class P Rule 12b-1 Plan."
Class P shares are available to a limited number of investors.

WHICH CLASS OF SHARES SHOULD YOU CHOOSE? Once you decide that thea fund is an
appropriate investment for you, the decision as to which class of shares is
better suited to your needs depends on a number of factors which you should
discuss with your financial adviser. The fund's class-specific expenses and the
effect of the different types of sales charges on your investment will affect
your investment results over time. The most important factors are how much you
plan to invest and how long you plan to hold your investment. If your goals and
objectives change over time and you plan to purchase additional shares, you
should re-evaluate those factors to see if you should consider another class of
shares.

In the following discussion, to help provide you and your financial adviser with
a framework in which to choose a class, we have made some assumptions using a
hypothetical investment in the fund. We used the sales charge rates that apply
to Class A, Class B and Class C, and considered the effect of the higher
distribution fees on Class B and Class C expenses (which will affect your
investment return). Of course, the actual performance of your investment cannot
be predicted and will vary, based on the fund's actual investment returns, the
operating expenses borne by each class of shares, and the class of shares you
purchase. The factors briefly discussed below are not intended to be investment
advice, guidelines or recommendations, because each investor's financial
considerations are different. The discussion below of the factors to consider in
purchasing a particular class of shares assumes that you will purchase only one
class of shares and not a combination of shares of different classes.

HOW LONG DO YOU EXPECT TO HOLD YOUR INVESTMENT? While future financial needs
cannot be predicted with certainty, knowing how long you expect to hold your
investment will assist you in selecting the appropriate class of shares. For
example, over time, the reduced sales charges available for larger purchases of
Class A shares may offset the effect of paying an initial sales charge on your
investment, compared to the effect over time of higher class-specific expenses
on Class B or Class C shares for which no initial sales charge is paid. Because
of the effect of class-based expenses, your choice should also depend on how
much you plan to invest.

Investing for the Short Term. If you have a short-term investment horizon (that
is, you plan to hold your shares for not more than six years), you should
probably consider purchasing Class A or Class C shares rather than Class B





                                       12






<PAGE>

<PAGE>

shares. This is because of the effect of the Class B CDSC if you redeem before
the sixth anniversary of your purchase, as well as the effect of the Class B
distribution fee on the investment return for that class in the short term.
Class C shares might be the appropriate choice (especially for investments of
less than $100,000), because there is no initial sales charge on Class C shares,
and the CDSC does not apply to amounts you redeem after holding them one year.

However, if you plan to invest more than $100,000 for the short term, then the
more you invest and the more your investment horizon increases toward six years,
the more attractive the Class A share option may become. This is because the
annual distribution fee on Class C shares will have a greater impact on your
account over the longer term than the reduced front-end sales charge available
for larger purchases of Class A shares. For example, Class A might be more
appropriate than Class C for investments of more than $100,000 expected to be
held for 5 or 6 years (or more). For investments over $250,000 expected to be
held 4 to 6 years (or more), Class A shares may become more appropriate than
Class C. If you are investing $500,000 or more, Class A may become more
desirable as your investment horizon approaches 3 years or more.

For most investors who invest $1 million or more or for Retirement Plans with at
least 100 eligible employees or for investments pursuant to a special retirement
wrap program, in most cases Class A shares will be the most advantageous choice,
no matter how long you intend to hold your shares. For that reason, it may not
be suitable for you to place a purchase order for Class B shares of $500,000 or
more or a purchase order for Class C shares of $1,000,000 or more. In addition,
it may not be suitable for you to place an order for Class B or C shares for a
Retirement Plan with at least 100 eligible employees or for a special retirement
wrap program. You should discuss this with your financial advisor.

Investing for the Longer Term. If you are investing for the longer term (for
example, to provide for future college expenses for your child) and do not
expect to need access to your money for seven years or more, Class B shares may
be an appropriate investment option, if you plan to invest less than $100,000.
If you plan to invest more than $100,000 over the long term, Class A shares will
likely be more advantageous than Class B shares or Class C shares, as discussed
above, because of the effect of the expected lower expenses for Class A shares
and the reduced initial sales charges available for larger investments in Class
A shares under the fund's Rights of Accumulation. Of course, these examples are
based on approximations of the effect of current sales charges and expenses on a
hypothetical investment over time, and should not be relied on as rigid
guidelines.

ARE THERE DIFFERENCES IN ACCOUNT FEATURES THAT MATTER TO YOU? Some account
features are available in whole or in part to Class A, Class B and Class C
shareholders. Other features (such as Systematic Withdrawal Plans) might not be
advisable in non-Retirement Plan accounts for Class B shareholders (because of
the effect of the CDSC on the entire amount of a withdrawal if it exceeds 12%
annually) and in any account for Class C shareholders during the first year of
share ownership (due to the CDSC on withdrawals during that year). See
"Systematic Withdrawal Plan" under "Shareholder Services" in the Prospectus for
more information about the 12% annual waiver of the CDSC. You should carefully
review how you plan to use your investment account before deciding which class
of shares you buy. For example, the dividends payable to Class B and Class C
shareholders will be reduced by the expenses borne solely by each of these
classes, such as the higher distribution fee to which Class B and Class C shares
are subject, as described below.

HOW DOES IT AFFECT PAYMENTS TO MY BROKER? A salesperson, such as a broker, or
any other person who is entitled to receive compensation for selling fund shares
may receive different compensation for selling one class than for selling
another class. As discussed in more detail below, such compensation is primarily
paid at the time of sale in the case of Class A and B shares and is paid over
time, so long as shares remain outstanding, in the case of Class C shares. It is
important that investors understand that the primary purpose of the CDSC for the
Class B shares and the distribution fee for Class B and Class C shares is the
same as the purpose of the front-end sales charge on sales of Class A shares: to
compensate brokers and other persons selling such shares. The CDSC, if payable,
supplements the Class B distribution fee and reduces the Class C distribution
fee expenses for the nd and Class C shareholders.

CLASS A, B, C AND P RULE 12b-1 PLANS. As described in the Prospectus, the
Company has adopted a Distribution Plan and Agreement pursuant to Rule 12b-1 of
the Act for each of the four Classes: the "A Plan," the "B Plan" the "C Plan,"
and the "P Plan," respectively. In adopting each Plan and in approving its
continuance, the Board of Directors has concluded that there is a reasonable
likelihood that each Plan will benefit its respective Class and such Class's




                                       13






<PAGE>

<PAGE>

shareholders. The expected benefits include greater sales and lower redemptions
of Class shares, which should allow each Class to maintain a consistent cash
flow, and a higher quality of service to shareholders by authorized institutions
than would otherwise be the case. Lord Abbett uses all amounts received under
each Plan as described in the Prospectus and for payments to dealers for (i)
providing continuous services to the shareholders, such as answering shareholder
inquiries, maintaining records, and assisting shareholders in making
redemptions, transfers, additional purchases and exchanges and (ii) their
assistance in distributing shares of the Company.

During the last fiscal year, the Company accrued or paid through Lord Abbett to
authorized institutions $6,368,420 under the A Plan, $93,175 under the B Plan
and $1,929,168 under the C Plan. Both the B Plan and the C Plans were adopted by
the FundCompany subsequent to its last fiscal year.

Each Plan requires the trustees to review, on a quarterly basis, written reports
of all amounts expended pursuant to the Plan and the purpose for which such
expenditures were made. Each Plan shall continue in effect only if its
continuance is specifically approved at least annually by vote of the Company's
Board of Trustees and of the Company trustees who are not interested persons of
the Fundcompany and who have no direct or indirect financial interest in the
operation of the Plan or in any agreements related to the Plan ("outside
trustees"), cast in person at a meeting called for the purpose of voting on such
Plan and agreements. No Plan may be amended to increase materially the amount
spent for distribution expenses without approval by a majority of the
outstanding voting securities of the appropriate class and the approval of a
majority of the trustees including a majority of the Company's outside trustees.
Each Plan may be terminated at any time by vote of a majority of the 's outside
trustees or by vote of a majority of its Class's outstanding voting securities.

CONTINGENT DEFERRED SALES CHARGES. A Contingent Deferred Sales Charge ("CDSC"),
applies upon early redemption of shares regardless of class, and (i) will be
assessed on the lesser of the net asset value of the shares at the time of
redemption or the original purchase price and (ii) is not imposed on the amount
of your account value represented by the increase in net asset value over the
initial purchase price (including increases due to the reinvestment of dividends
and capital gains distributions).

CLASS A SHARES (ALL FUNDS). As stated in the Prospectus, a CDSC is imposed with
respect to those Class A shares (or Class A shares of another Lord
Abbett-sponsored fund or series acquired through exchange of such shares) on
which a fund has paid the one-time 1% distribution fee if such shares are
redeemed out of the Lord Abbett-sponsored family of funds within a period of 24
months from the end of the month in which the original sale occurred.

CLASS B SHARES (U.S. GOVERNMENT SECURITIES FUND, BALANCED FUND, AND HIGH YIELD
FUND). As stated in the Prospectus, if Class B shares (or Class B shares of
another Lord Abbett-sponsored fund or series acquired through exchange of such
shares) are redeemed out of the Lord Abbett-sponsored family of funds for cash
before the sixth anniversary of their purchase, a CDSC will be deducted from the
redemption proceeds. The Class B CDSC is paid to Lord Abbett Distributor to
reimburse its expenses, in whole or in part, of providing distribution-related
service to the fund in connection with the sale of Class B shares.

To determine whether the CDSC applies to a redemption, the fund redeems
shares in the following order: (1) shares acquired by reinvestment of dividends
and capital gains distributions, (2) shares held on or after the sixth
anniversary of their purchase, and (3) shares held the longest before such sixth
anniversary.

The amount of the contingent deferred sales charge will depend on the number of
years since you invested and the dollar amount being redeemed, according to the
following schedule:







                                       14






<PAGE>

<PAGE>

<TABLE>
<CAPTION>

Anniversary of                Contingent Deferred Sales Charge
Purchase             on Redemptions (As % of Amount Subject to Charge)

<S>                                  <C>
Before the 1st.........................5.0%
On the 1st, before the 2nd.............4.0%
On the 2nd, before the 3rd.............3.0%
On the 3rd, before the 4th.............3.0%
On the 4th, before the 5th.............2.0%
On the 5th, before the 6th ............1.0%
On or after the 6th anniversary........None

</TABLE>

In the table, an "anniversary" is the 365th day subsequent to the acceptance of
a purchase order or a prior anniversary. All purchases are considered to have
been made on the business day on which the purchase order was accepted.

CLASS C SHARES (ALL FUNDS). As stated in the Prospectus, if Class C shares are
redeemed for cash before the first anniversary of their purchase, the redeeming
shareholder will be required to pay to the fund on behalf of Class C shares a
CDSC of 1% of the lower of cost or the then net asset value of Class C shares
redeemed. If such shares are exchanged into the same class of another Lord
Abbett-sponsored fund and subsequently redeemed before the first anniversary of
their original purchase, the charge will be collected by the other fund on
behalf of this fund's Class C shares.

GENERAL. Each percentage (1% in the case of Class A and C shares and 5% through
1% in the case of Class B shares) used to calculate CDSCs described above for
the Class A, Class B and Class C shares is sometimes hereinafter referred to as
the "Applicable Percentage."

With respect to Class A and Class B shares, no CDSC is payable on redemptions by
participants or beneficiaries from employer-sponsored retirement plans under the
Internal Revenue Code for benefit payments due to plan loans, hardship
withdrawals, death, retirement or separation from service and for returns of
excess contributions to retirement plan sponsors With respect to Class A shares
purchased pursuant to a special retirement wrap program, no CDSC is payable on
redemptions which continue or investments in another fund participating in the
program. In the case of Class A and Class C shares, the CDSC is received by the
fund and is intended to reimburse all or a portion of the amount paid by the
fund if the shares are redeemed before the fund has had an opportunity to
realize the anticipated benefits of having a long-term shareholder account in
the fund. In the case of Class B shares, the CDSC is received by Lord Abbett
Distributor and is intended to reimburse its expenses of providing
distribution-related service to the fund (including recoupment of the commission
payments made) in connection with the sale of Class B shares before Lord Abbett
Distributor has had an opportunity to realize its anticipated reimbursement by
having such a long-term shareholder account subject to the B Plan distribution
fee.

The other funds and series which participate in the Telephone Exchange Privilege
(except (a) Lord Abbett U.S. Government Securities Money Market Fund, Inc.
("GSMMF"), (b) certain series of Lord Abbett Tax-Free Income Fund and Lord
Abbett Tax-Free Income Trust for which a Rule 12b-1 Plan is not yet in effect,
and (c) any authorized institution's affiliated money market fund satisfying
Lord Abbett Distributor as to certain omnibus account and other criteria,
hereinafter referred to as an "authorized money market fund" or "AMMF"
(collectively, the "Non-12b-1 funds") have instituted a CDSC for each class on
the same terms and conditions. No CDSC will be charged on an exchange of shares
of the same class between Lord Abbett funds or between such funds and AMMF. Upon
redemption of shares out of the Lord Abbett family of funds or out of AMMF, the
CDSC will be charged on behalf of and paid: (i) to the fund in which the
original purchase (subject to a CDSC) occurred, in the case of the Class A and
Class C shares and (ii) to Lord Abbett Distributor if the original purchase was
subject to a CDSC, in the case of the Class B shares. Thus, if shares of a Lord
Abbett fund are exchanged for shares of the same class of another such fund and
the shares of the same class tendered ("Exchanged Shares") are subject to a
CDSC, the CDSC will carry over to the shares of the same class being acquired,
including GSMMF and AMMF ("Acquired Shares"). Any CDSC that is carried over to
Acquired Shares is calculated as if the holder of the Acquired Shares had held
those shares from the date on which he or she became the holder of the Exchanged
Shares. Although the Non-12b-1 funds will not pay a distribution fee on their
own shares, and will, therefore, not impose their own CDSC, the Non-12b-1 funds
will collect the CDSC (a) on behalf of other Lord Abbett funds, in the case of
the Class A and Class C shares and (b) on behalf of Lord Abbett Distributor, in
the case of the Class B shares. Acquired Shares held in GSMMF and AMMF which are
subject to a CDSC will be credited with the time such shares are held in GSMMF
but will not be credited with the time such shares are held in AMMF. Therefore,
if your Acquired Shares held in AMMF qualified for no CDSC or a lower Applicable
Percentage at the time





                                       15







<PAGE>

<PAGE>

of exchange into AMMF, that Applicable Percentage will apply to redemptions for
cash from AMMF, regardless of the time you have held Acquired Shares in AMMF.

In no event will the amount of the CDSC exceed the Applicable Percentage of the
lesser of (i) the net asset value of the shares redeemed or (ii) the original
cost of such shares (or of the Exchanged Shares for which such shares were
acquired). No CDSC will be imposed when the investor redeems (i) amounts derived
from increases in the value of the account above the total cost of shares being
redeemed due to increases in net asset value, (ii) shares with respect to which
no Lord Abbett fund or fund paid a 12b-1 fee and, in the case of Class B shares,
Lord Abbett Distributor paid no sales charge or service fee (including shares
acquired through reinvestment of dividend income and capital gains
distributions) or (iii) shares which, together with Exchanged Shares, have been
held continuously for 24 months from the end of the month in which the original
sale occurred (in the case of Class A shares); for six years or more (in the
case of Class B shares) or for one year or more (in the case of Class C shares).
In determining whether a CDSC is payable, (a) shares not subject to the CDSC
will be redeemed before shares subject to the CDSC and (b) of the shares subject
to a CDSC, those held the longest will be the first to be redeemed.

EXCHANGES. The Prospectus briefly describes the Telephone Exchange Privilege.
You may exchange some or all of your shares for those of (i) Lord
Abbett-sponsored funds currently offered to the public with a sales charge
(front-end, back-end or level), (ii) GSMMF or (iii) AMMF, to the extent offers
and sales may be made in your state. You should read the prospectus of the other
fund before exchanging. In establishing a new account by exchange, shares of the
und being exchanged must have a value equal to at least the minimum initial
investment required for the fund into which the exchange is made.

Shareholders in other Lord Abbett-sponsored funds have the same right to
exchange their shares for the corresponding class of the funds' shares.
Exchanges are based on relative net asset values on the day instructions are
received by the Fundfund in Kansas City if the instructions are received prior
to the close of the NYSE in proper form. No sales charges are imposed except in
the case of exchanges out of GSMMF or AMMF (unless a sales charge (front-end,
back-end or level) was paid on the initial investment in a Lord Abbett-sponsored
fund). Exercise of the exchange privilege will be treated as a sale for federal
income tax purposes, and, depending on the circumstances, a gain or loss may be
recognized. In the case of an exchange of shares that have been held for 90 days
or less where no sales charge is payable on the exchange, the original sales
charge incurred with respect to the exchanged shares will be taken into account
in determining gain or loss on the exchange only to the extent such charge
exceeds the sales charge that would have been payable on the acquired shares had
they been acquired for cash rather than by exchange. The portion of the original
sales charge not so taken into account will increase the basis of the acquired
shares.

Shareholders have the exchange privilege unless they refuse it in writing. You
should not view the exchange privilege as a means for taking advantage of
short-term swings in the market, and we reserve the right to terminate or limit
the privilege of any shareholder who makes frequent exchanges. We can revoke or
modify the privilege for all shareholders upon 60 days' prior notice. "Eligible
Funds" are AMMF and other Lord Abbett-sponsored funds which are eligible for the
exchange privilege, except Lord Abbett Series Fund ("LASF") which offers its
shares only in connection with certain variable annuity contracts and Lord
Abbett Equity Fund ("LAEF") which is not issuing shares.

STATEMENT OF INTENTION. Under the terms of the Statement of Intention to invest
$50,000 or more over a 13-month period as described in the Prospectus, shares of
Lord Abbett-sponsored funds (other than shares of LAEF, LASF, LARF, and GSMMF,
unless holdings in GSMMF are attributable to shares exchanged from a Lord
Abbett-sponsored fund offered with a front-end, back-end or level sales charge)
currently owned by you are credited as purchases (at their current offering
prices on the date the Statement is signed) toward achieving the stated
investment and reduced initial sales charges for Class A shares. Class A shares
valued at 5% of the amount of intended purchases are escrowed and may be
redeemed to cover the additional sales charge payable if the Statement is not
completed. The Statement of Intention is neither a binding obligation on you to
buy, nor on the fund to sell, the full amount indicated.

RIGHTS OF ACCUMULATION. As stated in the Prospectus, purchasers (as defined in
the Prospectus) may accumulate their investment in Lord Abbett-sponsored funds
(other than LAEF, LARF, LASF, and GSMMF, unless holdings in GSMMF are
attributable to shares exchanged from a Lord Abbett-sponsored fund offered with
a front-end, back-end or level sales charge) so that a current investment, plus
the purchaser's holdings valued at the current maximum offering price, reach a
level eligible for a discounted sales charge for Class A shares.




                                       16






<PAGE>

<PAGE>

NET ASSET VALUE PURCHASES OF CLASS A SHARES. As stated in the Prospectus, our
Class A shares may be purchased at net asset value by our trustees, employees of
Lord Abbett, employees of our shareholder servicing agent and employees of any
securities dealer having a sales agreement with Lord Abbett who consents to such
purchases or by the trustee or custodian under any pension or profit-sharing
plan or Payroll Deduction IRA established for the benefit of such persons or for
the benefit of employees of any national securities trade organization to which
Lord Abbett belongs or any company with an account(s) in excess of $10 million
managed by Lord Abbett on a private-advisory-account basis. For purposes of this
paragraph, the terms "trustees" and "employees" include a trustee's or
employee's spouse (including the surviving spouse of a deceased director or
employee). The terms "directors" and "employees of Lord Abbett" also include
other family members and retired trustees and employees.

Our Class A shares also may be purchased at net asset value (a) at $1 million or
more, (b) with dividends and distributions from Class A shares of other Lord
Abbett-sponsored funds, except for LARF, LAEF and LASF, (c) under the loan
feature of the Lord Abbett-sponsored prototype 403(b) plan for share purchases
representing the repayment of principal and interest, (d) by certain authorized
brokers, dealers, registered investment advisers or other financial institutions
who have entered into an agreement with Lord Abbett Distributor in accordance
with certain standards approved by Lord Abbett Distributor, providing
specifically for the use of our shares in particular investment products made
available for a fee to clients of such brokers, dealers, registered investment
advisers and other financial institutions, ("mutual fund wrap fee program"), (e)
by employees, partners and owners of unaffiliated consultants and advisors to
Lord Abbett, Lord Abbett Distributor or Lord Abbett-sponsored funds who consent
to such purchase if such persons provide service to Lord Abbett, Lord Abbett
Distributor or such funds on a continuing basis and are familiar with such
funds, (f) through Retirement Plans with at least 100 eligible employees, (g)
our Class A shares also may be purchased at net asset value, subject to
appropriate documentation, through a securities dealer where the amount invested
represents redemption proceeds from shares ("Redeemed Shares") of a registered
open-end management investment company not distributed or managed by Lord Abbett
(other than a money market fund), if such redemption has occurred no more than
60 days prior to the purchase of our shares, the Redeemed Shares were held for
at least six months prior to redemption and the proceeds of redemption were
maintained in cash or a money market fund prior to purchase. Purchasers should
consider the impact, if any, of contingent deferred sales charges in determining
whether to redeem shares for subsequent investment in our Class A shares. Lord
Abbett may suspend, change or terminate this purchase option referred to in (g)
above at any time, we plan that on June 1, 1997 the net asset value transfer
privilege will be terminated, and (h) through a "special retirement wrap
program" sponsored by an authorized institution showing one or more
characteristics distinguishing it, in the opinion of Lord Abbett Distributor
from a mutual fund wrap program. Such characteristics include, among other
things, the fact that an authorized institution does not charge its clients any
fee of a consulting or advisory nature that is economically equivalent to the
distribution fee under Class A 12b-1 Plan and the fact that the program relates
to participant-directed Retirement Plan with respect to the U.S. Government
Securities Fund only,. Shares are offered at net asset value to these investors
for the purpose of promoting goodwill with employees and others with whom Lord
Abbett Distributor and/or the fund has business relationships.

REDEMPTIONS. A redemption order is in proper form when it contains all of the
information and documentation required by the order form or supplementally by
Lord Abbett Distributor or the Company to carry out the order. The signature(s)
and any legal capacity of the signer(s) must be guaranteed by an eligible
guarantor. See the Prospectus for expedited redemption procedures.

The right to redeem and receive payment, as described in the Prospectus, may be
suspended if the NYSE is closed (except for weekends or customary holidays),
trading on the NYSE is restricted or the Securities and Exchange Commission
deems an emergency to exist.

Our Board of Trustees may authorize redemption of all of the shares in any
account in which there are fewer than 25 shares. Before authorizing such
redemption, the Board must determine that it is in our economic best interest or
necessary to reduce disproportionately burdensome expenses in servicing
shareholder accounts. At least 30 days' prior written notice will be given
before any such redemption, during which time shareholders may avoid redemption
by bringing their accounts up to the minimum set by the Board.

DIV-MOVE. Under the Div-Move service described in the Prospectus, you can invest
the dividends paid on your account into an existing account in any other
Eligible Fund. The account must be either your account, a joint account for you
and your spouse, a single account for your spouse, or a custodial account for
your minor child under the age of 21. You should read the prospectus of the
other fund before investing.




                                       17







<PAGE>

<PAGE>

INVEST-A-MATIC. The Invest-A-Matic method of investing in the Fund and/or any
other Eligible Fund is described in the Prospectus. To avail yourself of this
method you must complete the application form, selecting the time and amount of
your bank checking account withdrawals and the funds for investment, include a
voided, unsigned check and complete the bank authorization.

SYSTEMATIC WITHDRAWAL PLANS. The Systematic Withdrawal Plan (the "SWP") also is
described in the Prospectus. You may establish a SWP if you own or purchase
uncertificated shares having a current offering price value of at least $10,000.
Lord Abbett prototype retirement plans have no such minimum. With respect to a
SWP for Class B shares, on redemptions over 12% per year, the CDSC will apply to
the entire redemption. Therefore, please contact the fund for assistance in
minimizing the CDSC in this situation. With respect to Class C shares, the CDSC
will be waived on and after the first anniversary of their purchase. The SWP
involves the planned redemption of shares on a periodic basis by receiving
either fixed or variable amounts at periodic intervals. Since the value of
shares redeemed may be more or less than their cost, gain or loss may be
recognized for income tax purposes on each periodic payment. Normally, you may
not make regular investments at the same time you are receiving systematic
withdrawal payments because it is not in your interest to pay a sales charge on
new investments when in effect a portion of that new investment is soon
withdrawn. The minimum investment accepted while a withdrawal plan is in effect
is $1,000. The SWP may be terminated by you or by us at any time by written
notice.

RETIREMENT PLANS. The Prospectus indicates the types of retirement plans for
which Lord Abbett provides forms and explanations. Lord Abbett makes available
the retirement plan forms and custodial agreements for IRAs (Individual
Retirement Accounts including Simple IRAs and Simplified Employee Pensions),
403(b) plans and qualified pension and profit-sharing plans, including 401(k)
plans. The forms name Investors Fiduciary Trust Company as custodian and contain
specific information about the plans. Explanations of the eligibility
requirements, annual custodial fees and allowable tax advantages and penalties
are set forth in the relevant plan documents. Adoption of any of these plans
should be on the advice of your legal counsel or qualified tax adviser.

                                       6.

                                   PERFORMANCE

Each fund computes the average annual compounded rate of total return for each
Class during specified periods that would equate the initial amount invested to
the ending redeemable value of such investment by adding one to the computed
average annual total return, raising the sum to a power equal to the number of
years covered by the computation and multiplying the result by $1,000, which
represents a hypothetical initial investment. The calculation assumes deduction
of the maximum sales charge (as described in the next paragraph) from the amount
invested and reinvestment of all income dividends and capital gains
distributions on the reinvestment dates at net asset value. The ending
redeemable value is determined by assuming a complete redemption at the end of
the period(s) covered by the average annual total return computation.

In calculating total returns for Class A shares, the current maximum sales
charge of 3.0% with respect to the Balanced Fund and 4.75% with respect to
the Limited Duration Government Fund, U.S. Government Securities Fund and High
Yield Fund (as a percentage of the offering price) is deducted from the initial
investment (unless the return is shown at net asset value). For Class B shares
of the U.S. Government Securities Fund and the High Yield Fund, the payment of
the applicable CDSC (5.0% prior to the first anniversary of purchase, 4.0% prior
to the second anniversary of purchase, 3.0% prior to the third and fourth
anniversaries of purchase, 2.0% prior to the fifth anniversary of purchase, 1.0%
prior to the sixth anniversary of purchase and no CDSC on and after the sixth
anniversary of purchase) is applied to the fund's investment result for that
class for the time period shown (unless the total return is shown at net asset
value). For Class C shares, the 1.0% CDSC is applied to the applicable
Series'fund's investment result for that class for the time period shown prior
to the first anniversary of purchase (unless the total return is shown at net
asset value). Total returns also assume that all dividends and capital gains
distributions during the period are reinvested at net asset value per share, and
that the investment is redeemed at the end of the period.

Using the method to compute average annual compounded total return described
above, the total annual return for the U.S. Government Securities Fund for the
fiscal year ended October 31, 1996, the one-month period ended November 30,
1996, the fiscal years ended November 30, 1997 and November 30, 1998 were     %,
    %,     % and     % for the Class A shares. The total return for the Limited
Duration U.S. Government Securities Fund for the fiscal year ended October 31,
1996, the one-month period ended November 30, 1996 and fiscal years ended
November 30, 1997 and






                                       18






<PAGE>

<PAGE>

November 30, 1998 were     %,     %,     % and     % for the Class A shares. The
total return for the Balanced Fund for the fiscal year ended October 31, 1996,
the one-month period ended November 30, 1996 and fiscal years ended November 30,
1997 and November 30, 1998 were     %,     %,     % and     % for the Class A
shares.

The total return for Class B shares of the U.S. Government Securities Fund for
the period August 1, 1996 to November 30, 1996, and the fiscal years ended
November 30, 1997 and November 30, 1998 were     %,     %,     %, respectively.
The total return for Class B shares of the Balanced Fund for the period May 1,
1998 to November 30, 1998 was     %.

The total return for Class C shares of the Limited Duration U.S. Government
Securities Fund for the period July 15, 1996 to October 31, 1996, the one month
period ended November 30, 1996 and fiscal years ended November 30, 1997 and
November 30, 1998 were 1.97%, 0.09$, 4.40% and     %, respectively. The total
return for Class C shares of the Balanced Fund for the same periods were 6.72%,
3.65%, 13.10% and     %, respectively. The total return for Class C shares of
the U.S. Government Securities Fund for same periods were 5.34%, 5.90% and
    %, respectively.

Each fund's yield quotation is based on a 30-day period ended on a specified
date, computed by dividing our net investment income per share earned during the
period by our maximum offering price per share on the last day of the period.
This is determined by finding the following quotient: take the fund's dividends
and interest earned during the period minus its expenses accrued for the period
and divide by the product of (i) the average daily number of fund shares
outstanding during the period that were entitled to receive dividends and (ii)
the fund's at maximum offering price per share on the last day of the period. To
this quotient add one. This sum is multiplied by itself five times. Then one is
subtracted from the product of the multiplication and the remainder is
multiplied by two. Yield for the Class A shares reflects the deduction of the
maximum initial sales charge, but may also be shown based on the fund's net
asset value per share. Yields for Class B and C shares do not reflect the
deduction of the CDSC. For the 30-day period ended November 30, 1998, the
Limited Duration Government Fund and Balanced Fund yields were     % and      %,
respectively.

It is important to remember that any figures developed using the formulas above
represent past performance and an investor should be aware that the investment
return and principal value of the a fund's investment will fluctuate so that an
investor's shares, when redeemed, may be worth more or less than their original
cost. Therefore, there is no assurance that this performance will be repeated in
the future.

                                       7.

                                      TAXES

The value of any shares redeemed, repurchased or otherwise sold may be more or
less than your tax basis in the shares at the time the redemption, repurchase or
sale is made. Any gain or loss generally will be taxable for federal income tax
purposes. Any loss realized on the sale, redemption or repurchase of fund
shares which you have held for six months or less will be treated for federal
income tax purposes as a long-term capital loss to the extent of any capital
gains distributions which you received with respect to such shares. Losses on
the sale of fund shares are not deductible if, within a period beginning 30 days
before the date of the sale and ending 30 days after the date of the sale, the
taxpayer acquires stock or securities that are substantially identical.

Each fund will be subject to a 4% nondeductible excise tax on certain amounts
not distributed (and not treated as having been distributed) on a timely basis
in accordance with a calendar year distribution requirement. Each fund intends
to distribute to shareholders each year an amount adequate to avoid the
imposition of such excise tax. Dividends paid by the fund will qualify for the
dividends-received deduction for corporations to the extent that they are
derived from dividends paid by domestic corporations.

The foregoing discussion relates solely to U.S. federal income tax law as
applicable to United States persons (United States citizens or residents and
United States domestic corporations, partnerships, trusts and estates). Each
shareholder who is not a United States person should consult his tax adviser
regarding the U.S. and foreign tax consequences of the ownership of shares of
each fund, including a 30% (or lower treaty rate) United States withholding tax
on dividends representing ordinary income and net short-term capital gains and
the applicability of United States gift and estate taxes to non-United States
persons who own fund shares.





                                       19






<PAGE>

<PAGE>

                                       8.

                          INFORMATION ABOUT THE COMPANY

SHAREHOLDER LIABILITY. Delaware law provides that Company shareholders shall be
entitled to the same limitations of personal liability extended to shareholders
of private corporations for profit. The courts of some states, however, may
decline to apply Delaware law on this point. The Company's Declaration of
Trust contains an express disclaimer of shareholder liability for the acts,
obligations, or affairs of the Company or any fund and requires that a
disclaimer be given in each contract entered into or executed by the Company.
The Declaration provides for indemnification out of the Company's property of
any shareholder or former shareholder held personally liable for the obligations
of the Company. Thus, the risk of a shareholder incurring financial loss on
account of shareholder liability is limited to circumstances in which Delaware
law does not apply, no contractual limitation of liability was in effect and the
portfolio is unable to meet its obligations. Lord Abbett believes that, in view
of the above, the risk of personal liability to shareholders is extremely
remote.

GENERAL. The assets of the Company received for the issue or sale of the shares
of each fund and all income, earnings, profits, and proceeds thereof, subject
only to the rights of creditors, are especially allocated to each fund,
and constitute the underlying assets of such fund. The underlying assets
of each fund are recorded on the books of account of the fund, and are to be
charged with the liabilities with respect to such fund and with a share of the
general expenses of the fund. Expenses with respect to the fund are to be
allocated in a manner and on a basis (generally in proportion to relative
assets) deemed fair and equitable by the trustees. In the event of the
dissolution or liquidation of the Company, the holders of the shares of each
fund are entitled to receive as a class the underlying assets of such fund
available for distribution.

Under the Company's Declaration of Trust, the trustees may, upon shareholder
vote, cause the Company to merge or consolidate into, or sell and convey all or
substantially all of, the assets of the Company or any fund to one or more
trusts, partnerships or corporations, so long as the surviving entity is an
open-end management investment company that will succeed to or assume the
Company's registration statement. In addition, the trustees may, without
shareholder vote, cause the Company to be incorporated under Delaware law.

Derivative actions on behalf of the Company or any fund may be brought only by
shareholders owning not less than 50% of the then outstanding shares of the
Company or any fund, as applicable.

The directors, trustees and officers of Lord Abbett-sponsored mutual funds,
together with the partners and employees of Lord Abbett, are permitted to
purchase and sell securities for their personal investment account. In engaging
in personal securities transactions, however, such persons are subject to
requirements and restrictions contained in the fund's Code of Ethics which
complies, in substance, with each of the recommendations of the Investment
Company Institute's Advisory Group on Personal Investing. Among other things,
the Code requires that Lord Abbett partners and employees obtain advance
approval before buying or selling securities, submit confirmations and quarterly
transaction reports, and obtain approval before becoming a director of any
company; and it prohibits such persons from investing in a security seven days
before or after any Lord Abbett-sponsored fund trades in such security,
profiting from trades of the same security within 60 days and trading on
material non-public information. The Code imposes similar requirements and
restrictions on the independent Trustees of the fund to the extent contemplated
by the recommendations of such Advisory Group.

                                       9.

                              FINANCIAL STATEMENTS

The financial statements for fiscal year ended November 30, 19978 and the report
of Deloitte & Touche LLP, independent auditors, on such annual financial
statements contained in the 1998 Annual Report to Shareholders of the Lord
Abbett Investment Trust are incorporated herein by reference to such financial
statements and report in reliance upon the authority of Deloitte & Touche LLP as
experts in auditing and accounting.





                                       20







<PAGE>

<PAGE>

                                       10.

                                    APPENDIX

                  CORPORATE BOND RATINGS (HIGH YIELD FUND ONLY)

Moody's Investors Service, Inc.'s Corporate Bond Ratings

Aaa - Bonds which are rated Aaa are judged to be of the best quality and carry
the smallest degree of investment risk. Interest payments are protected by a
large or by an exceptionally stable margin, and principal is secure. While the
various protective elements are likely to change, such changes as can be
visualized are most unlikely to impair the fundamentally strong position of such
issues.

Aa - Bonds which are rated Aa are judged to be of high-quality by all standards.
Together with the Aaa group, they comprise what are generally known as
high-grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as in Aaa securities, fluctuation of protective
elements may be of greater amplitude or there may be other elements present
which make the long-term risks appear somewhat larger than in Aaa securities.

A - Bonds which are rated A possess many favorable investment attributes and are
to be considered as upper medium-grade obligations. Factors giving security to
principal and interest are considered adequate but elements may be present which
suggest a susceptibility to impairment sometime in the future.

Baa - Bonds which are rated Baa are considered as medium-grade obligations,
i.e., they are neither highly protected nor poorly secured. Interest payments
and principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and, in
fact, have speculative characteristics as well.

Ba - Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well assured. Often the protection of interest
and principal payments may be very moderate and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.

B - Bonds which are rated B generally lack characteristics of a desirable
investment. Assurance of interest and principal payments or of maintenance and
other terms of the contract over any long period of time may be small.

Caa - Bonds that are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.

Ca - Bonds that are rated Ca represent obligations which are speculative in a
high degree. Such issues are often in default or have other marked shortcomings.

C - Bonds that are rated C are the lowest-rated class of bonds and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.

Standard & Poor's Corporation's Corporate Bond Ratings

AAA - This is the highest rating assigned by Standard & Poor's to a debt
obligation and indicates an extremely strong capacity to pay principal and
interest.

AA - Bonds rated AA also qualify as high-quality debt obligations. Capacity to
pay principal and interest is very strong and in the majority of instances they
differ from AAA issues only in small degree.





                                       21






<PAGE>

<PAGE>

A - Bonds rated A have a strong capacity to pay principal and interest, although
they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions.

BBB - Bonds rated BBB are regarded as having an adequate capacity to pay
principal and interest. Whereas they normally exhibit adequate protection
parameters, adverse economic conditions or changing circumstances are more
likely to lead to a weakened capacity to pay principal and interest for bonds in
this category than for bonds in the A category.

BB-B-CCC-CC-C - Debt rated BB, B, CCC, CC and C is regarded as having
predominately speculative characteristics with respect to capacity to pay
interest and repay principal. 'BB' in the least degree of speculation and 'CCC'
the highest. such debt will likely have some quality and protective
characteristics, these are outweighed by large uncertainties or major risk
exposures to adverse conditions.

D - Debt rated 'D' is in payment default. The 'D' rating category is used when
interest payments or principal payments are not made on the date due even if the
applicable grace period has not expired, unless S&P believes such payments will
be made during such grace period. The 'D' rating also will be us the filing of a
bankruptcy petition if debt service payments are jeopardized.





                                       22






<PAGE>

<PAGE>

LORD ABBETT

STATEMENT OF ADDITIONAL INFORMATION                                APRIL 1, 1999

                          LORD ABBETT INVESTMENT TRUST
                            CORE FIXED INCOME SERIES
                       STRATEGIC CORE FIXED INCOME SERIES

This Statement of Additional Information is not a Prospectus. A Prospectus may
be obtained from your securities dealer or from Lord Abbett Distributor LLC
("Lord Abbett Distributor") at The General Motors Building, 767 Fifth Avenue,
New York, New York 10153-0203. This Statement relates to, and should be read in
conjunction with, the Prospectus dated April 1, 1999.

Lord Abbett Investment Trust (referred to as the "Company") was organized as a
Delaware business trust on August 16, 1993. The Company's trustees have
authority to create separate classes of shares of beneficial interest and
separate funds without further action by shareholders. The Company has six
funds, two of which are discussed in this Statement of Additional Information:
Core Fixed Income Series ("Core Fixed Income Fund") and Strategic Core Fixed
Income Series ("Strategic Core Fixed Income Fund"), both of which offer only one
class of shares: Class Y. All shares have equal noncumulative voting rights and
equal rights with respect to dividends, assets and liquidation, except for
certain class-specific expenses. They are fully paid and nonassessable when
issued and have no preemptive or conversion rights. Further classes or funds may
be added in the future. The Investment Company Act of 1940, as amended (the
"Act") requires that where more than one class or fund exists, each class or
fund must be preferred over all other classes or funds in respect of assets
specifically allocated to such class or fund.

Rule 18f-2 under the Act provides that any matter required to be submitted, by
the provisions of the Act or applicable state law or otherwise, to the holders
of the outstanding voting securities of an investment company such as the
Company shall not be deemed to have been effectively acted upon unless approved
by the holders of a majority of the outstanding shares of each class or fund
affected by such matter. Rule 18f-2 further provides that a class or fund shall
be deemed to be affected by a matter unless the interests of each class or fund
in the matter are substantially identical or the matter does not affect any
interest of such class or fund.

Shareholder inquiries should be made by writing directly to the Company or by
calling 800-821-5129. In addition, you can make inquiries through your dealer.

<TABLE>
<CAPTION>
            TABLE OF CONTENTS                                         Page

<S>                                                                   <C>
            1.  Investment Policies                                   2
            2.  Trustees and Officers                                 5
            3.  Investment Advisory and Other Services                8
            4.  Portfolio Transactions                                9
            5.  Purchases, Redemptions and Shareholder Services       10
            6.  Past Performance                                      11
            7.  Taxes                                                 11
            8.  Information About the Company                         12
            9.  Financial Statements                                  13


</TABLE>



                                       1







<PAGE>

<PAGE>


                                       1.

                               Investment Policies

FUNDAMENTAL INVESTMENT RESTRICTIONS
We are subject to the following investment restrictions, which cannot be changed
without approval of a majority of our outstanding shares. Each fund may not: (1)
borrow money, except that (i) each fund may borrow from banks (as defined in the
Act) in amounts up to 33 1/3% of its total assets (including the amount
borrowed), (ii) each fund may borrow up to an additional 5% of its total assets
for temporary purposes, (iii) each fund may obtain such short-term credit as may
be necessary for the clearance of purchases and sales of portfolio securities
and (iv) each fund may purchase securities on margin to the extent permitted by
applicable law; (2) pledge its assets (other than to secure borrowings, or to
the extent permitted by the fund's investment policies as permitted by
applicable law); (3) engage in the underwriting of securities, except pursuant
to a merger or acquisition or to the extent that, in connection with the
disposition of its portfolio securities, it may be deemed to be an underwriter
under federal securities laws; (4) make loans to other persons, except that the
acquisition of bonds, debentures or other corporate debt securities and
investment in government obligations, commercial paper, pass-through
instruments, certificates of deposit, bankers acceptances, repurchase agreements
or any similar instruments shall not be subject to this limitation, and except
further that each fund may lend its portfolio securities, provided that the
lending of portfolio securities may be made only in accordance with applicable
law; (5) buy or sell real estate (except that each fund may invest in securities
directly or indirectly secured by real estate or interests therein or issued by
companies which invest in real estate or interests therein) or commodities or
commodity contracts (except to the extent each fund may do so in accordance with
applicable law and without registering as a commodity pool operator under the
Commodity Exchange Act as, for example, with futures contracts)); (6) with
respect to 75% of its gross assets, buy securities of one issuer representing
more than (i) 5% of the its gross assets, except securities issued or guaranteed
by the U.S. government, its agencies or instrumentalities or (ii) 10% of the
voting securities of such issuer; (7) invest more than 25% of its assets, taken
at market value, in the securities of issuers in any particular industry
(excluding (i) securities of the U.S. government, its agencies and
instrumentalities and (ii) mortgage-backed securities); and (8) issue senior
securities to the extent such issuance would violate applicable law.

Compliance with these restrictions will be determined at the time of purchase or
sale of such securities and will not be affected by changes in the market value
of portfolio securities.

NON-FUNDAMENTAL INVESTMENT RESTRICTIONS

In addition to the investment restrictions above which cannot be changed without
shareholder approval, we also are subject to the policies described in the
Prospectus and the following investment policies which may be changed by the
Board of Trustees without shareholder approval. Each fund may not: (1) borrow in
excess of 5% of its gross assets taken at cost or market value, whichever is
lower at the time of borrowing, and then only as a temporary measure for
extraordinary or emergency purposes; (2) make short sales of securities or
maintain a short position except to the extent permitted by applicable law; (3)
invest knowingly more than 15% of its net assets (at the time of investment) in
illiquid securities, except for securities qualifying for resale under Rule 144A
of the Securities Act of 1933, deemed to be liquid by the Board of Trustees; (4)
invest in the securities of other investment companies except as permitted by
applicable law; (5) hold securities of any issuer if more than 1/2 of 1% of the
securities of such issuer are owned beneficially by one or more officers or
trustees of the fund or by one or more partners or members of the fund's
underwriter or investment adviser if these owners in the aggregate own
beneficially more than 5% of the securities of such issuer; (6) invest in
warrants if, at the time of the acquisition, its investment in warrants, valued
at the lower of cost or market, would exceed 5% of the fund's total assets
(included within such limitation, but not to exceed 2% of the fund's total
assets, are warrants which are not listed on the New York or American Stock
Exchange or a major foreign exchange); (7) invest in real estate limited
partnership interests or interests in oil, gas or other mineral leases, or
exploration or other development programs, except that each fund may invest in
securities issued by companies that engage in oil, gas or other mineral
exploration or other development activities; (8) write, purchase or sell puts,
calls, straddles, spreads or combinations thereof, except to the extent
permitted in the fund's prospectus and statement of additional information, as
they may be amended from time to time; or (9) buy from or sell to any of its
officers, trustees, employees, or its investment adviser or any of its officers,
trustees, partners or employees, any securities other than shares of beneficial
interest in such fund.

Although there is no current intention to do so, each fund may invest in
financial futures and options on financial futures.







                                       2






<PAGE>

<PAGE>

INVESTMENT TECHNIQUES

FOREIGN CURRENCY HEDGING TECHNIQUES. Strategic Core Fixed Income Fund may use
various foreign currency hedging techniques described below, including forward
foreign currency contracts and foreign currency put and call options.

FORWARD FOREIGN CURRENCY CONTRACTS. A forward foreign currency contract involves
an obligation to purchase or sell a specific amount of a specific currency at a
set price at a future date. Strategic Core Fixed Income Fund expects to enter
into forward foreign currency contracts in primarily two circumstances. First,
when the fund enters into a contract for the purchase or sale of a security
denominated in a foreign currency, it may desire to "lock in" the U.S. dollar
price of the security. By entering into a forward contract for the purchase or
sale of the amount of foreign currency involved in the underlying security
transaction, the fund will be able to protect against a possible loss resulting
from an adverse change in the relationship between the U.S. dollar and the
subject foreign currency during the period between the date the security is
purchased or sold and the date on which payment is made or received.

Second, when management believes that the currency of a particular foreign
country may suffer a decline against the U.S. dollar, the fund may enter into a
forward contract to sell the amount of foreign currency approximating the value
of some or all of the fund's portfolio securities denominated in such foreign
currency or, in the alternative, the fund may use a cross-hedging technique
whereby it sells another currency which the fund expects to decline in a similar
way but which has a lower transaction cost. Precise matching of the forward
contract amount and the value of the securities involved will not generally be
possible since the future value of such securities denominated in foreign
currencies will change as a consequence of market movements in the value of
those securities between the date the forward contract is entered into and the
date it matures. The fund does not intend to enter into such forward contracts
under this second circumstance on a continuous basis.

FOREIGN CURRENCY PUT AND CALL OPTIONS. The fund may also purchase foreign
currency put options and write foreign currency call options on U.S. exchanges
or U.S. over-the-counter markets. A put option gives the fund, upon payment of a
premium, the right to sell a currency at the exercise price until the expiration
of the option and serves to insure against adverse currency price movements in
the underlying portfolio assets denominated in that currency.

Exchange-listed options markets in the United States include several major
currencies, and trading may be thin and illiquid. A number of major investment
firms trade unlisted options which are more flexible than exchange-listed
options with respect to strike price and maturity date. Unlisted options
generally are available in a wider range of currencies, including those of most
of the developed countries. Unlisted foreign currency options are generally less
liquid than listed options and involve the credit risk associated with the
individual issuer. Unlisted options are subject to a limit of 5% of the fund's
net assets.

A call option written by the fund gives the purchaser, upon payment of a
premium, the right to purchase from the fund a currency at the exercise price
until the expiration of the option. The fund may write a call option on a
foreign currency only in conjunction with a purchase of a put option on that
currency. Such a strategy is designed to reduce the cost of downside currency
protection by limiting currency appreciation potential. The face value of such
writing may not exceed 90% of the value of the securities denominated in such
currency invested in by the fund or in such cross currency (referred to above)
to cover such call writing.

LENDING PORTFOLIO SECURITIES. Each fund may lend portfolio securities to
registered brokers-dealers. These loans, if and when made, may not exceed 30% of
the fund's total assets. The funds' loans of securities will be collateralized
by cash or marketable securities issued or guaranteed by the U.S. Government or
its agencies ("U.S. Government securities") or other permissible means in an
amount at least equal to the market value of the loaned securities. From time to
time, each fund may pay a part of the interest received with respect to the
investment of collateral to the borrower and/or a third party that is not
affiliated with the fund and is acting as a "placing broker." No fee will be
paid to affiliated persons of a fund.

By lending portfolio securities, each fund may can increase its income by
continuing to receive income on the loaned securities as well as by either
investing the cash collateral in permissible investments, such as U.S.
government securities, or obtaining yield in the form of interest paid by the
borrower when such U.S. government securities or other forms of non-cash
collateral are used as security. Each fund will comply with the following
conditions whenever it loans securities: (i) the fund must receive at least 100%
collateral from the borrower; (ii) the borrower must increase the collateral
whenever the market value of the securities loaned rises above the level of the
collateral; (iii) the fund must be able to terminate the loan at any time; (iv)
the fund must receive reasonable compensation with respect to the loan, as well
as any dividends, interest or other distributions on the loaned securities; (v)
the fund may pay only reasonable fees in connection with the loan; and (vi)
voting rights on the loaned securities may pass to the borrower except that, if
the fund has knowledge





                                       3






<PAGE>

<PAGE>

of a material event adversely affecting the investment in the loaned securities,
the fund must terminate the loan and regain the right to vote the securities.

REPURCHASE AGREEMENTS. Each fund may enter into repurchase agreements with
respect to a security. A repurchase agreement is a transaction by which the fund
acquires a security and simultaneously commits to resell that security to the
seller (a bank or securities dealer), and the seller commits to repurchase that
security, at an agreed upon price on an agreed upon date. The resale price
reflects the purchase price plus an agreed upon market rate of interest which is
unrelated to the coupon rate or date of maturity of the purchased security. (In
this type of transaction, the securities purchased by the fund must have a total
value in excess of the value of the repurchase agreement.) Each fund requires at
all times that the repurchase agreement be collateralized by cash or U.S.
government securities having a value equal to, or in excess of, the value of the
repurchase agreement. Such agreements permit the funds to keep all of their
assets at work while retaining flexibility in pursuit of investments of a longer
term nature.

The use of repurchase agreements involves certain risks. For example, if the
seller of the agreement defaults on its obligation to provide additional
collateral or to repurchase the underlying securities at a time when the value
of these securities has declined, the fund may incur a loss upon disposition of
them. If the seller of the agreement becomes insolvent and subject to
liquidation or reorganization under the Bankruptcy Code or other laws, a
bankruptcy court may determine that the underlying securities are collateral not
within the control of the fund and are therefore subject to sale by the trustee
in bankruptcy. Even though the repurchase agreements may have maturities of
seven days or less, they may lack liquidity, especially if the issuer encounters
financial difficulties. While management acknowledges these risks, it is
expected that they can be controlled through stringent selection criteria and
careful monitoring procedures. Management intends to limit repurchase agreements
for the funds to transactions with dealers and financial institutions believed
to present minimal credit risks. Management will monitor creditworthiness of the
repurchase agreement sellers on an ongoing basis.

Each fund will enter into repurchase agreements only with those primary
reporting dealers that report to the Federal Reserve Bank of New York and with
the 100 largest United States commercial banks and the underlying securities
purchased under the agreements will consist only of those securities in which a
fund otherwise may invest.

WHEN-ISSUED TRANSACTIONS. As stated in the Prospectus, each fund may purchase
portfolio securities on a when-issued basis. When-issued transactions involve a
commitment by a fund to purchase securities, with payment and delivery
("settlement") to take place in the future, in order to secure what is
considered to be an advantageous price or yield at the time of entering into the
transaction. The value of fixed-income securities to be delivered in the future
will fluctuate as interest rates vary. During the period between purchase and
settlement, the value of the securities will fluctuate and assets consisting of
cash and/or marketable securities (normally short-term U.S. government
securities) marked to market daily in an amount sufficient to make payment at
settlement will be segregated at our custodian in order to pay for the
commitment. There is a risk that market yields available at settlement may be
higher than yields obtained on the purchase date, which could result in
depreciation of value of fixed-income when-issued securities. At the time a fund
makes the commitment to purchase a security on a when-issued basis, it will
record the transaction and reflect the liability for the purchase and the value
of the security in determining its net asset value. Each fund generally has the
ability to close out a purchase obligation on or before the settlement date
rather than take delivery of the security. Under no circumstance will settlement
for such securities take place more than 120 days after the purchase date.

AVERAGE DURATION. Each fund limits its average dollar weighted portfolio
duration to a range of between two years more than and two years less than the
Lehman Brothers Aggregate Bond Index. Since this index currently has a duration
of ___ years, this range currently is between ___ years and ___ years. However,
many of the securities in which each fund invests will have remaining durations
in excess of ___ years.

Some of the securities in each fund's portfolio may have periodic interest rate
adjustments based upon an index such as the 91-day Treasury Bill rate. This
periodic interest rate adjustment tends to lessen the volatility of the
security's price. With respect to securities with an interest rate adjustment
period of one year or less, each fund will, when determining average-weighted
duration, treat such a security's maturity as the amount of time remaining until
the next interest rate adjustment.

Instruments such as GNMA, FNMA, FHLMC securities and similar securities backed
by amortizing loans generally have shorter effective maturities than their
stated maturities. This is due to changes in amortization caused by demographic
and economic forces such as interest rate movements. These effective maturities
are calculated based upon historical payment patterns and therefore have shorter
duration than would be implied by their stated final maturity. For purposes of
determining each fund's average maturity, the maturities of such securities will
be calculated based upon the issuing agency's payment factors using
industry-accepted valuation models.






                                       4






<PAGE>

<PAGE>

PORTFOLIO TURNOVER. For the fiscal year ended November 30, 1998, the Core Fixed
Income Fund's portfolio turnover rate was __%. The portfolio turnover rate for
the Strategic Core Fixed Income Fund's first year of operation is expected to be
within a range of 100% - 1,000%. As discussed above, each fund may purchase
securities on a when-issued basis with settlement taking place after the
purchase date (without amortizing any premiums). If the funds use this
investment technique, it is expected to contribute significantly to the
portfolio turnover rates. However, it will have little or no transaction cost or
adverse tax consequences. Transaction costs normally will exclude brokerage
because each fund's fixed-income portfolio transactions are usually on a
principal basis and any markups charged normally will be more than offset by the
beneficial economic consequences anticipated at the time of purchase or no
purchase will be made. Generally, short-term losses on short-term U.S.
government securities purchased under this investment technique tend to offset
any short-term gains due to such high portfolio turnover.

                                       2.

                              TRUSTEES AND OFFICERS

The following trustee is a partner of Lord, Abbett & Co. ("Lord Abbett"), The
General Motors Building, 767 Fifth Avenue, New York, New York 10153-0203. He has
been associated with Lord Abbett for over five years and also is an officer
and/or director or trustee of the twelve other Lord Abbett-sponsored funds. He
is a "interested person" as defined in the Act, and as such, may be considered
to have an indirect financial interest in the Rule 12b-1 Plan described in the
Prospectus.

Robert S. Dow, age 54, Chairman and President

The following outside trustees are also directors or trustees of the twelve
other Lord Abbett-sponsored funds.

E. Thayer Bigelow
Time Warner Inc.
1271 Avenue of the Americas
New York, New York

Senior Adviser, Time Warner Inc. Formerly, Acting Chief Executive Officer of
Courtroom Television Network (1997-1998). Formerly, President and Chief
Executive Officer of Time Warner Cable Programming, Inc. (1991-1997). Prior to
that, President and Chief Operating Officer of Home Box Office, Inc. Age 57.

William H. T. Bush
Bush-O'Donnell & Co., Inc.
101 South Hanley Road, Suite 1025
St. Louis, Missouri

Co-founder and Chairman of the Board of the financial advisory firm of
Bush-O'Donnell & Company. Age 60.

Robert B. Calhoun
Monitor Clipper Partners
650 Madison Avenue, 9th Floor
New York, New York

Managing Director of Monitor Clipper Partners and President of the Clipper Group
L.P., both private equity investment funds. Age 56.

Stewart S. Dixon
Wildman, Harrold, Allen & Dixon
225 W. Wacker Drive (Suite 2800)
Chicago, Illinois

Partner in the law firm of Wildman, Harrold, Allen & Dixon. Age 68.






                                       5






<PAGE>

<PAGE>

John C. Jansing
162 S. Beach Road
Hobe Sound, Florida

Retired. Former Chairman of Independent Election Corporation of America, a proxy
tabulating firm. Age 73.

C. Alan MacDonald
Directorship Inc.
8 Sound Shore Drive
Greenwich, Connecticut

Managing Director of Directorship Inc., a consultancy in board management and
corporate governance. Formerly General Partner of The Marketing Partnership,
Inc., a full service marketing consulting firm (1994-1997). Prior to that,
Chairman and Chief Executive Officer of Lincoln Snacks, Inc., manufacturer of
branded snack foods (1992-1994). His career spans 36 years at Stouffers and
Nestle with 18 of the years as Chief Executive Officer. Currently serves as
Director of DenAmerica Corp., J. B. Williams Company, Inc., Fountainhead Water
Company and Exigent Diagnostics. Age 65.

Hansel B. Millican, Jr.
Rochester Button Company
1328 Broadway (Suite 816)
New York, New York

President and Chief Executive Officer of Rochester Button Company. Age 70.

Thomas J. Neff
Spencer Stuart
277 Park Avenue
New York, New York

Chairman of Spencer Stuart, an executive search consulting firm. Currently
serves as Director of Ace, Ltd. (NYSE). Age 61.

The second column of the following table sets forth the compensation accrued for
the Company's outside trustees. The third column sets forth information with
respect to the equity-based benefits accrued for outside trustees/directors
maintained by the Lord Abbett-sponsored funds. The fourth column sets forth the
total compensation payable by such funds to the outside trustees/directors. No
trustee of the Company associated with Lord Abbett and no officer of the Company
received any compensation from the Company for acting as a trustee or officer.

<TABLE>
<CAPTION>

                             For the Fiscal Year Ended November 30, 1998
                             -------------------------------------------

                                                  Pension or               For Year Ended
                                                  Retirement Benefits      December 31, 1998
                                                  Accrued by the           Total Compensation
                              Aggregate           Company and              Accrued by the Company and
                              Compensation        Twelve Other Lord        Twelve Other Lord
                              Accrued by          Abbett-sposored          Abbett-sponsored
Name of Trustee               the Fund(1)         Companies(2)             Companies(3)
- ----------------              -----------         ------------             ------------

<S>                           <C>                 <C>                      <C>
E. Thayer Bigelow             $                   $17,068                  $56,000
William H. T. Bush*           $                   $none                    None
Robert B. Calhoun**           $                   $none                    None
Stewart S. Dixon              $                   $32,190                  $55,000
John C. Jansing               $                   $45,085(4)               $55,000
C. Alan MacDonald             $                   $30,703                  $57,400
Hansel B. Millican,           $                   $37,747                  $55,000


</TABLE>




                                       6







<PAGE>

<PAGE>


<TABLE>

<S>                           <C>                 <C>                      <C>
Thomas J. Neff                $                   $19,853                  $56,000


</TABLE>

 *Elected trustee as of August 13, 1998.
**Elected trustee as of June 17, 1998.

1.Outside trustee/directors' fees, including attendance fees for board and
  committee meetings, are allocated among all Lord Abbett sponsored funds based
  on the net assets of each fund. A portion of the fees payable by the Company
  to its outside trustees is being deferred under a plan that deems the deferred
  amounts to be invested in shares of the Company for later distribution to the
  trustees.

2.The amounts in Column 3 were accrued by the Lord Abbett-sponsored Funds for
  the twelve months ended November 30, 1998 with respect to the equity based
  plans established for independent trustees/directors directors in 1996. This
  plan supercedes a previously approved retirement plan for all future
  directors. Current directors had the option to convert their accrued benefits
  under the retirement plan. All of the outside directors except one made such
  an election. Each plan also provides for a pre-retirement death benefit and
  actuarially reduced joint-and-survivor spousal benefits.

3.This column shows aggregate compensation, including directors fees and
  attendance fees for board and committee meetings, of a nature referred to in
  footnote one, accrued by the Lord Abbett-sponsored funds during the year ended
  December 31, 1998. The amounts of the aggregate compensation payable by the
  Company as of December 31, 1998 deemed invested in Company shares, including
  dividends reinvested and changes in net asset value applicable to such deemed
  investments, were: Mr. Bigelow, $       ; Mr. Bush, $       ; Mr. Calhoun,
  $       ; Mr. Dixon, $       ; Mr. Jansing, $       ; Mr. MacDonald,
  $       ; Mr. Millican, $        and Mr. Neff, $       . If the amounts
  deemed invested in Company shares were added to each director's actual
  holdings of Company shares as of December 31, 1998, each would own the
  following: Mr. Bigelow,         shares; Mr. Bush,         shares; Mr.
  Calhoun,         shares; Mr. Dixon,         shares; Mr. Jansing,        
  shares; Mr. McDonald,         shares; Mr. Millican,         shares; and Mr.
  Neff,         shares.

4.Mr. Jansing chose to continue to receive benefits under the retirement plan,
  which provides that outside directors/trustees may receive annual retirement
  benefits for life equal to their final annual retainer following retirement at
  or after age 72 with at least ten years of service. Thus, if Mr. Jansing were
  to retire and the annual retainer payable by the funds were the same as it is
  today, he would receive annual retirement benefits of $50,000.

EXECUTIVE VICE PRESIDENTS:

Christopher J. Towle, age 41 (with Lord Abbett since 1988 and has over 17 years
of investment experience)

Robert Gerber, age 44 (with Lord Abbett since 1997, formerly Senior Portfolio
manager at Sanford C. Bernstein & Co. from 1992-1997)

Robert G. Morris, age 54

VICE PRESIDENTS:

Paul A. Hilstad, age 56, Vice President and Secretary (with Lord Abbett since
1995; formerly Senior Vice President and General Counsel of American Capital
Management & Research, Inc.)

Zane E. Brown, age 47

Daniel E. Carper, age 47

W. Thomas Hudson, age 57

Lawrence H. Kaplan, age 42 (with Lord Abbett since 1997--formerly Vice President
and Chief Counsel of Salomon Brothers Asset Management Inc from 1995 to 1997,
prior thereto Senior Vice President, Director and General Counsel of Kidder
Peabody Asset Management, Inc.)

Thomas F. Konop, age 56




                                       7






<PAGE>

<PAGE>

Robert A. Lee, age 29 (with Lord Abbett since 1997, formerly Portfolio Manager
at Arm Capital Advisors from 1995-1997; prior thereto Assistant Portfolio
Manager at Kidder Peabody Asset Management from 1993-1995)

A.Edward Oberhaus III, age 39

Keith F. O'Connor, age 43

Walter H. Prahl, age 40 (wirh Lord Abbett since 1997, formerly Quantitative
Analyst at Sanford C. Bernstein & Co. from 1994-1997)

TREASURER:

Donna M. McManus, age 38 (with Lord Abbett since 1996, formerly a Senior Manager
at Deloitte & Touche LLP).

The Company does not hold annual meetings of shareholders unless one or more
matters are required to be acted on by shareholders under the Act. Under the
Company's Declaration of Trust, shareholder meetings may be called at any time
by certain officers of the Company or by a majority of the trustees (i) for the
purpose of taking action upon any matter requiring the vote or authority of the
Company's shareholders or upon other matters deemed to be necessary or desirable
or (ii) upon the written request of the holders of at least one-quarter of the
shares of the series outstanding and entitled to vote at the meeting.

As of          ,1999, our officers and trustees, as a group, owned less than 1%
of the outstanding shares of Core Fixed Income Fund and less than 1% of
Strategic Core Fixed Income Fund. As of           1999, there were no record
holders of 5% or more of the fund's outstanding shares.

                                       3.

                     INVESTMENT ADVISORY AND OTHER SERVICES

The services performed by Lord Abbett are described under "Management" in the
Prospectus. Under the Management Agreement, we are obligated to pay Lord Abbett
a monthly fee, based on average daily net assets for each month, at the annual
rate of .50 of 1% for each the Core Fixed Income Fund and Strategic Core Fixed
Income Fund. These fees are allocated among the classes of each fund based on
the class' proportionate share of each fund's average daily net assets.

Each fund pays all of its expenses not expressly assumed by Lord Abbett,
including, without limitation, 12b-1 expenses, outside trustees' fees and
expenses, association membership dues, legal and audit fees, taxes, transfer and
dividend disbursing agent fees, shareholder servicing costs, expenses relating
to shareholder meetings, expenses of preparing, printing and mailing share
certificates and shareholder reports, expenses of registering our shares under
federal and state securities laws, expenses of preparing, printing and mailing
prospectuses to existing shareholders, insurance premiums and brokerage and
other expenses connected with executing portfolio transactions.

The management fee paid to Lord Abbett by the Core Fixed Income Fund for the
fiscal year ended November 30, 1998 amounted to $       . For the Strategic Core
Fixed Income Fund for the same period, the management fee paid to Lord Abbett
amounted to $       .

Although not obligated to do so, Lord Abbett may waive all or part of its
management fees and or may assume other expenses of each fund.

Deloitte & Touche LLP, Two World Financial Center, New York, New York 10281, are
the independent public accountants of the Company and must be approved at least
annually by our trustees to continue in such capacity. Deloitte & Touche LLP
perform audit services for the Company, including the examination of financial
statements included in our annual report to shareholders.

Bank of New York, 40 Wall Street, New York, New York, is the Company's
custodian.







                                       8






<PAGE>

<PAGE>

                                       4.

                             PORTFOLIO TRANSACTIONS

The funds expect that purchases and sales of their portfolio securities usually
will be principal transactions and normally such securities will be purchased
directly from the issuer or from an underwriter or market maker for the
securities. Therefore, the funds usually will pay no brokerage commissions for
such purchases. Purchases from underwriters of portfolio securities will include
a commission or concession paid by the issuer to the underwriter and purchases
from dealers serving as market makers will include a dealer's markup. Principal
transactions, including riskless principal transactions, are not afforded the
protection of the safe harbor in Section 28 (e) of the Securities Exchange Act
of 1934.

Each fund's policy is to have purchases and sales of portfolio securities
executed at most favorable prices, considering all costs of the transaction
including brokerage commissions and dealer markups and markdowns, consistent
with obtaining best execution, except to the extent that we may pay a higher
commission rate as described below. This policy governs the selection of brokers
or dealers and the market in which the transaction is executed. To the extent
permitted by law, we may, if considered advantageous, make a purchase from or
sale to another Lord Abbett-sponsored fund without the intervention of any
dealer.

Broker-dealers are selected on the basis of their professional capability and
the value and quality of their brokerage and research services. Normally, the
selection is made by traders who are officers of the Company and also are
employees of Lord Abbett. These traders do the trading as well for other
accounts -- investment companies (of which they are also officers) and other
investment clients -- managed by Lord Abbett. They are responsible for the
negotiation of prices and any commissions.

We may pay a brokerage commission on the purchase or sale of a security that
could be purchased from or sold to a market maker if our net cost of the
purchase or the net proceeds to us of the sale are at least as favorable as we
could obtain on a direct purchase or sale. Brokers who receive such commissions
may also provide research services at least some of which are useful to Lord
Abbett in their overall responsibilities with respect to us and the other
accounts they manage. Research includes trading equipment and computer software
packages, acquired from third-party suppliers, that enable Lord Abbett to access
various information bases and may include the furnishing of analyses and reports
concerning issuers, industries, securities, economic factors and trends,
portfolio strategy and the performance of accounts. Such services may be used by
Lord Abbett in servicing all their accounts, and not all of such services will
necessarily be used by Lord Abbett in connection with their management of the
funds, conversely, such services furnished in connection with brokerage on other
accounts managed by Lord Abbett may be used in connection with their management
of the funds, and not all of such services will necessarily be used by Lord
Abbett in connection with their advisory services to such other accounts. We
have been advised by Lord Abbett that research services received from brokers
cannot be allocated to any particular account, are not a substitute for Lord
Abbett's services but are supplemental to their own research effort and, when
utilized, are subject to internal analysis before being incorporated by Lord
Abbett into their investment process. As a practical matter, it would not be
possible for Lord Abbett to generate all of the information presently provided
by brokers. While receipt of research services from brokerage firms has not
reduced Lord Abbett's normal research activities, the expenses of Lord Abbett
could be materially increased if it attempted to generate such additional
information through its own staff and purchased such equipment and software
packages directly from the suppliers.

No commitments are made regarding the allocation of brokerage business to or
among brokers, and trades are executed only when they are dictated by investment
decisions of each fund to purchase or sell portfolio securities.

If two or more broker-dealers are considered capable of offering the equivalent
likelihood of best execution, the broker-dealer who has sold our shares and/or
shares of other Lord Abbett-sponsored funds may be preferred.

If other clients of Lord Abbett buy or sell the same security at the same time
as we do, transactions will, to the extent practicable, be allocated among all
participating accounts in proportion to the amount of each order and will be
executed daily until filled so that each account shares the average price and
commission cost of each day. Other clients who direct that their brokerage
business be placed with specific brokers or who invest through wrap accounts
introduced to Lord Abbett by certain brokers may not participate with us in the
buying and selling of the same securities as described above. If these clients
wish to buy or sell the same security as we do, they may have their transactions
executed at times different from our transactions and thus may not receive the
same price or incur the same commission cost as we do.





                                       9






<PAGE>

<PAGE>

We will not seek "reciprocal" dealer business (for the purpose of applying
commissions in whole or in part for our benefit or otherwise) from dealers as
consideration for the direction to them of portfolio business.

During the fiscal year ended November 30, 1998, the Core Fixed Income Fund and
Strategic Core Fixed Income Fund paid no commissions to independent brokers.

                                       5.

                 PURCHASES, REDEMPTIONS AND SHAREHOLDER SERVICES

With respect to the foreign assets of the Strategic Core Fixed Income Fund, all
assets and liabilities expressed in foreign currencies will be converted into
U.S. dollars at the mean between the buying and selling rates of such currencies
against U.S. dollars last quoted by any major bank. If such quotations are not
available, the rate of exchange will be determined in accordance with policies
established by the Board of Trustees of the Company. The Board of Trustees will
monitor, on an ongoing basis, each fund's method of valuation.

Information concerning how we value our shares for the purchase and redemption
of our shares is contained in the Prospectus under "Purchases."

As disclosed in the Prospectus, we calculate our net asset value as of the close
of the New York Stock Exchange ("NYSE") on each day that the NYSE is open for
trading by dividing our total net assets by the number of shares outstanding at
the time of calculation. The NYSE is closed on Saturdays and Sundays and the
following holidays -- New Year's Day, Martin Luther King, Jr. Day, Presidents'
Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and
Christmas.

Each Fund values its portfolio securities at market value as of the close of the
NYSE. Market value will be determined as follows: securities listed or admitted
to trading privileges on the New York or American Stock Exchange or on the
NASDAQ National Market System are valued at the last sales price, or, if there
is no sale on that day, at the mean between the last bid and asked prices, or,
in the case of bonds, in the over-the-counter market if, in the judgment of the
Fund's officers, that market more accurately reflects the market value of the
bonds. Over-the-counter securities not traded on the NASDAQ National Market
System are valued at the mean between the last bid and asked prices. Securities
for which market quotations are not available are valued at fair market value
under procedures approved by the Board of Directors (Trustees).

The net asset value per share for the Class Y shares will be determined by
taking Class Y shares net assets and dividing by shares outstanding. Our Class Y
shares will be offered at net asset value.

The offering price of Class Y shares of the funds for the period indicated below
were computed as follows:

<TABLE>
<CAPTION>

                                                              November 30, 1998

                                                   Core Fixed Income Fund       Strategic Core
                                                   ----------------------       Fixed Income Fund
                                                                                -----------------

<S>                                                <C>                          <C>
Net asset value per share (net assets divided
  by shares outstanding)..........                         $xx.xx                    $xx.xx
</TABLE>

Each Fund has entered into a distribution agreement with Lord Abbett Distributor
LLC, a New York limited liability company ("Lord Abbett Distributor") and
subsidiary of Lord Abbett under which Lord Abbett Distributor is obligated to
use its best efforts to find purchasers for the shares of each Fund, and to make
reasonable efforts to sell Fund shares so long as, in Lord Abbett Distributor's
judgment, a substantial distribution can be obtained by reasonable efforts.

CLASS Y SHARE EXCHANGES. The Prospectus describes the Telephone Exchange
Privilege. You may exchange some or all of your Y shares for Y shares of any
Lord Abbett-sponsored funds currently offering Class Y shares to the public.
Currently those other funds consist of







                                       10







<PAGE>

<PAGE>

Lord Abbett Investment Trust - Core Fixed Income Fund, Strategic Core Fixed
Income Fund, Bond-Debenture Fund, Developing Growth Fund, and Mid-Cap Value
Fund.

REDEMPTIONS. A redemption order is in proper form when it contains all of the
information and documentation required by the order form or supplementally by
Lord Abbett Distributor or the Fund to carry out the order. The signature(s) and
any legal capacity of the signer(s) must be guaranteed by an eligible guarantor.
See each Prospectus for expedited redemption procedures.

The right to redeem and receive payment, as described in each Prospectus, may be
suspended if the NYSE is closed (except for weekends or customary holidays),
trading on the NYSE is restricted or the Securities and Exchange Commission
deems an emergency to exist.

Our Board of Trustees may authorize redemption of all of the shares in any
account in which there are fewer than 25 shares (Affiliated Fund, Small-Cap
Fund, Growth Opportunities Fund, and High Yield Fund), and 60 shares
(International Fund). Before authorizing such redemption, the Board must
determine that it is in our economic best interest or necessary to reduce
disproportionately burdensome expenses in servicing shareholder accounts. At
least 6 month's prior written notice will be given before any such redemption,
during which time shareholders may avoid redemption by bringing their accounts
up to the minimum set by the Board.

                                       6.

                                   PERFORMANCE

Each Fund computes the annual compounded rate of total return for Class Y shares
during specified periods that would equate the initial amount invested to the
ending redeemable value of such investment by adding one to the computed average
annual total return, raising the sum to a power equal to the number of years
covered by the computation and multiplying the result by one thousand dollars,
which represents a hypothetical initial investment. The calculation assumes
deduction of no sales charge from the initial amount invested and reinvestment
of all income dividends and capital gains distributions on the reinvestment
dates at prices calculated as stated in each Prospectus. The ending redeemable
value is determined by assuming a complete redemption at the end of the
period(s) covered by the annual total return computation.

In calculating total returns for Class Y shares no sales charge is deducted from
the initial investment and the return is shown at net asset value. Total returns
also assume that all dividends and capital gains distributions during the period
are reinvested at net asset value per share, and that the investment is redeemed
at the end of the period.

CLASS Y SHARE PERFORMANCE. Using the computation method described above, Core
Fixed Income Fund's total return for Class Y shares for the period from
inception (         ) to November 30, 1998 was      %. For the period from
inception (           ) to November 30, 1998, the total return for the Strategic
Core Fixed Income Fund was     %.

Our yield quotation for Class Y shares is based on a 30-day period ended on a
specified date, computed by dividing the net investment income per share earned
during the period by the net asset value per share of such class on the last day
of the period. This is determined by finding the following quotient: take the
dividends and interest earned during the period for the class minus its expenses
accrued for the period and divide by the product of (i) the average daily number
of Class shares outstanding during the period that were entitled to receive
dividends and (ii) the net asset value per share of such class on the last day
of the period. To this quotient add one. This sum is multiplied by itself five
times. Then one is subtracted from the product of this multiplication and the
remainder is multiplied by two. Yields for Class Y shares do not reflect the
deduction of any sales charge.

These figures represent past performance, and an investor should be aware that
the investment return and principal value of a Fund's investment will fluctuate
so that an investor's shares, when redeemed, may be worth more or less than
their original cost. Therefore, there is no assurance that this performance will
be repeated in the future.

                                       7.

                                      TAXES

The value of any shares redeemed, repurchased or otherwise sold may be more or
less than your tax basis in the shares at the time the redemption, repurchase or
sale is made. Any gain or loss generally will be taxable for federal income tax
purposes. Any loss





                                       11






<PAGE>

<PAGE>

realized on the sale, redemption or repurchase of fund shares which you have
held for six months or less will be treated for federal income tax purposes as a
long-term capital loss to the extent of any distribution designated by a fund as
a "capital gains distribution" which you received with respect to such shares.
Losses on the sale of fund shares are not deductible if, within a period
beginning 30 days before the date of the sale and ending 30 days after the date
of the sale, the taxpayer acquires stock or securities that are substantially
identical.

Each fund will be subject to a 4% nondeductible excise tax on certain amounts
not distributed (and not treated as having been distributed) on a timely basis
in accordance with a calendar year distribution requirement. Each fund intends
to distribute to shareholders each year an amount adequate to avoid the
imposition of such excise tax. Dividends paid by each fund will qualify for the
dividends-received deduction for corporations to the extent that they are
derived from dividends paid by domestic corporations.

The Strategic Core Fixed Income Fund may be subject to foreign withholding taxes
which would reduce the yield on its investments. Tax treaties between certain
countries and the United States may reduce or eliminate such taxes. It is
expected that fund shareholders who are subject to United States federal income
tax will be entitled to claim a federal income tax credit or deduction for
foreign income taxes paid by the fund.

Gains and losses realized by the fund on certain transactions, including sales
of foreign debt securities and certain transactions involving foreign currency,
will be treated as ordinary income or loss for federal income tax purposes to
the extent, if any, that such gains or losses are attributable to changes in
exchange rates for foreign currencies. Accordingly, distributions taxable as
ordinary income will include the net amount, if any, of such foreign exchange
gains and will be reduced by the net amount, if any, of such foreign exchange
losses.

The foregoing discussion relates solely to U.S. federal income tax law as
applicable to U.S. persons (U.S. citizens or residents and U.S. domestic
corporations, partnerships, trusts and estates). Each shareholder who is not a
U.S. person should consult his tax adviser regarding the U.S. and foreign tax
consequences of the ownership of shares of the fund, including a 30% (or lower
treaty rate) U.S. withholding tax on dividends representing ordinary income and
net short-term capital gains and the applicability of U.S. gift and estate taxes
to non-U.S. persons who own fund shares.

                                       8.

                          INFORMATION ABOUT THE COMPANY

SHAREHOLDER LIABILITY. Delaware law provides that Company shareholders shall be
entitled to the same limitations of personal liability extended to shareholders
of private corporations for profit. The courts of some states, however, may
decline to apply Delaware law on this point. The Company's Declaration of Trust
contains an express disclaimer of shareholder liability for the acts,
obligations, or affairs of the Company or any series (or fund) and requires that
a disclaimer be given in each contract entered into or executed by the Company.
The Declaration provides for indemnification out of the Company's property of
any shareholder or former shareholder held personally liable for the obligations
of the Company. Thus, the risk of a shareholder incurring financial loss on
account of shareholder liability is limited to circumstances in which Delaware
law does not apply, no contractual limitation of liability was in effect and the
portfolio is unable to meet its obligations. Lord Abbett believes that, in view
of the above, the risk of personal liability to shareholders is extremely
remote.

GENERAL. The assets of the Company received for the issue or sale of the shares
of each fund and all income, earnings, profits, and proceeds thereof, subject
only to the rights of creditors, are especially allocated to each fund, and
constitute the underlying assets of such fund. The underlying assets of each
fund are recorded on the books of account of the Company, and are to be charged
with the liabilities with respect to such fund and with a share of the general
expenses of the Company. Expenses with respect to the Company are to be
allocated in a manner and on a basis (generally in proportion to relative
assets) deemed fair and equitable by the trustees. In the event of the
dissolution or liquidation of the Company, the holders of the shares of each
fund are entitled to receive as a class the underlying assets of such fund
available for distribution.

Under the Company's Declaration of Trust, the trustees may, upon shareholder
vote, cause the Company to merge or consolidate into, or sell and convey all or
substantially all of, the assets of the Company or any fund to one or more
trusts, partnerships or corporations, so long as the surviving entity is an
open-end management investment company that will succeed to or assume the
Company's






                                       12







<PAGE>

<PAGE>

registration statement. In addition, the trustees may, without shareholder vote,
cause the Company to be incorporated under Delaware law.

Derivative actions on behalf of the Company or any fund may be brought only by
shareholders owning not less than 50% of the then outstanding shares of the
Company or any fund, as applicable.

The directors, trustees and officers of Lord Abbett-sponsored mutual funds,
together with the partners and employees of Lord Abbett, are permitted to
purchase and sell securities for their personal investment account. In engaging
in personal securities transactions, however, such persons are subject to
requirements and restrictions contained in the Company's Code of Ethics, which
complies, in substance, with each of the recommendations of the Investment
Company Institute's Advisory Group on Personal Investing. Among other things,
the Code requires that Lord Abbett partners and employees obtain advance
approval before buying or selling securities, submit confirmations and quarterly
transaction reports, and obtain approval before becoming a director of any
company; and it prohibits such persons from investing in a security seven days
before or after any Lord Abbett-sponsored fund trades in such security,
profiting from trades of the same security within 60 days and trading on
material non-public information. The Code imposes similar requirements and
restrictions on the independent Trustees of the Company to the extent
contemplated by the recommendations of such Advisory Group.



                                       9.

                              FINANCIAL STATEMENTS

The financial statements for fiscal year ended November 30, 1998 and the report
of Deloitte & Touche LLP, independent auditors, on such annual financial
statements contained in the 1998 Annual Report to Shareholders of the Lord
Abbett Investment Trust are incorporated herein by reference to such financial
statements and report in reliance upon the authority of Deloitte & Touche LLP as
experts in auditing and accounting.




                                       13









<PAGE>

<PAGE>

PART C  OTHER INFORMATION

Item 23  Exhibits

     (a) Articles of Incorporation. Incorporated by reference.
     (b) By-Laws. Incorporated by reference to Post-Effective Amendment No. 19
         to the Registration Statement filed on Form N-1A on December 30, 1998.
     (c) Instruments Defining Rights of Security Holders. Incorporated by
         reference.
     (d) Investment Advisory Contracts. Incorporated by reference.
     (e) Underwriting Contracts. Incorporated by reference.
     (f) Bonus or Profit Sharing Contracts. Incorporated by reference.
     (g) Custodian Agreements. Incorporated by reference.
     (h) Other Material Contracts. Incorporated by reference.
     (i) Legal Opinion. Incorporated by reference.
     (j) Other Opinions. Consent of Independent Auditors.
     (k) Omitted Financial Statements. Incorporated by reference.
     (l) Initial Capital Agreements. Incorporated by reference.
     (m) Rule 12b-1 Plan. Incorporated by reference.
     (n) Financial Data Schedule.
     (o) Rule 18f-3 Plan. Incorporated by reference.

Item 24. Persons Controlled by or Under Common Control with the Fund

         None.

Item 25. Indemnification

         The Registrant is a Delaware Business Trust established under Chapter
         38 of Title 12 of the Delaware Code. The Registrant's Declaration and
         Instrument of Trust at Section 4.3 relating to indemnification of
         Trustees, officers, etc. states the following.

         The Trust shall indemnify each of its Trustees, officers, employees and
         agents (including any individual who serves at its request as director,
         officer, partner, trustee or the like of another organization in which
         it has any interest as a shareholder, creditor or otherwise) against
         all liabilities and expenses, including but not limited to amounts paid
         in satisfaction of judgments, in compromise or as fines and penalties,
         and counsel fees reasonably incurred by him or her in connection with
         the defense or disposition of any action, suit or other proceeding,
         whether civil or criminal, before any court or administrative or
         legislative body in which he or she may be or may have been involved as
         a party or otherwise or with which he or she may be or may have been
         threatened, while acting as Trustee or as an officer, employee or agent
         of the Trust or the Trustees, as the case may be, or thereafter, by
         reason of his or her being or having been such a Trustee, officer,
         employee or agent, except with respect to any matter as to which he or
         she shall have been adjudicated not to have acted in good faith in the
         reasonable belief that his or her action was in the best interests of
         the Trust or any Series thereof. Notwithstanding anything herein to the
         contrary, if any matter which is the subject of indemnification
         hereunder relates only to one Series (or to more than one but not all
         of the Series of the Trust), then the indemnity shall be paid only out
         of the assets of the affected Series. No individual shall be
         indemnified hereunder against any liability to the Trust or any Series
         thereof or the Shareholders by reason of willful misfeasance, bad
         faith, gross negligence or reckless disregard of the duties involved in
         the conduct of his or her office. In addition, no such indemnity shall
         be provided with respect to any matter disposed of by settlement or a
         compromise payment by such Trustee, officer, employee or agent,
         pursuant to a consent decree or otherwise, either for said payment or
         for any other expenses unless there has been a determination that such

                                        1






<PAGE>

<PAGE>

         compromise is in the best interests of the Trust or, if appropriate, of
         any affected Series thereof and that such Person appears to have acted
         in good faith in the reasonable belief that his or her action was in
         the best interests of the Trust or, if appropriate, of any affected
         Series thereof, and did not engage in willful misfeasance, bad faith,
         gross negligence or reckless disregard of the duties involved in the
         conduct of his or her office. All determinations that the applicable
         standards of conduct have been met for indemnification hereunder shall
         be made by (a) a majority vote of a quorum consisting of disinterested
         Trustees who are not parties to the proceeding relating to
         indemnification, or (b) if such a quorum is not obtainable or, even if
         obtainable, if a majority vote of such quorum so directs, by
         independent legal counsel in a written opinion, or (c) a vote of
         Shareholders (excluding Shares owned of record or beneficially by such
         individual). In addition, unless a matter is disposed of with a court
         determination (i) on the merits that such Trustee, officer, employee or
         agent was not liable or (ii) that such Person was not guilty of willful
         misfeasance, bad faith, gross negligence or reckless disregard of the
         duties involved in the conduct of his or her office, no indemnification
         shall be provided hereunder unless there has been a determination by
         independent legal counsel in a written opinion that such Person did not
         engage in willful misfeasance, bad faith, gross negligence or reckless
         disregard of the duties involved in the conduct of his or her office.

         The Trustees may make advance payments out of the assets of the Trust
         or, if appropriate, of the affected Series in connection with the
         expense of defending any action with respect to which indemnification
         might be sought under this Section 4.3. The indemnified Trustee,
         officer, employee or agent shall give a written undertaking to
         reimburse the Trust or the Series in the event it is subsequently
         determined that he or she is not entitled to such indemnification and
         (a) the indemnified Trustee, officer, employee or agent shall provide
         security for his or her undertaking, (b) the Trust shall be insured
         against losses arising by reason of lawful advances, or (c) a majority
         of a quorum of disinterested Trustees or an independent legal counsel
         in a written opinion shall determine, based on a review of readily
         available facts (as opposed to a full trial-type inquiry), that there
         is reason to believe that the indemnitee ultimately will be found
         entitled to indemnification. The rights accruing to any Trustee,
         officer, employee or agent under these provisions shall not exclude any
         other right to which he or she may be lawfully entitled and shall inure
         to the benefit of his or her heirs, executors, administrators or other
         legal representatives.

         Insofar as indemnification for liability arising under the Securities
         Act of 1933 may be permitted to Trustees, officers and controlling
         persons of the Registrant pursuant to the foregoing provisions, or
         otherwise, the Registrant has been advised that in the opinion of the
         Securities and Exchange Commission such indemnification is against
         public policy as expressed in the Act and is, therefore, unenforceable.
         In the event that a claim for indemnification against such liabilities
         (other than the payment by the Registrant of expense incurred or paid
         by a Trustee, officer or controlling person of the Registrant in the
         successful defense of any action, suit or proceeding) is asserted by
         such Trustee, officer or controlling person in connection with the
         securities being registered, the Registrant will, unless in the opinion
         of its counsel the matter has been settled by controlling precedent,
         submit to a court of appropriate jurisdiction the question whether such
         indemnification by it is against public policy as expressed in the Act
         and will be governed by the final adjudication of such issue.

Item 26. Business and Other Connections of Investment Adviser

         Lord, Abbett & Co. acts as investment manager and/or principal
         underwriter for twelve other Lord Abbett open-end investment companies
         (of which it is principal underwriter for thirteen), and, as of
         September 30, 1998, as investment adviser to approximately 8,330
         private accounts. Other than acting as Trustees (directors) and/or
         officers of open-end investment companies managed by Lord, Abbett &
         Co., none of Lord, Abbett & Co.'s partners has, in the past two fiscal
         years, engaged in any other business, profession, vocation or
         employment of a substantial nature for his own account or in the
         capacity of director, officer, employee, partner or trustee of any
         entity.

                                        2






<PAGE>

<PAGE>


Item 27. Principal Underwriter

(a)      Lord Abbett Affiliated Fund, Inc.
         Lord Abbett Bond-Debenture Fund, Inc.
         Lord Abbett Mid-Cap Value Fund, Inc.
         Lord Abbett Developing Growth Fund, Inc.
         Lord Abbett Tax-Free Income Fund, Inc.
         Lord Abbett Government Securities Money Market Fund, Inc.
         Lord Abbett Tax-Free Income Trust
         Lord Abbett Global Fund, Inc.
         Lord Abbett Equity Fund
         Lord Abbett Series Fund, Inc.
         Lord Abbett Research Fund, Inc.
         Lord Abbett Securities Trust

         Investment Advisor
         American Skandia Trust (Lord Abbett Growth and Income Portfolio)

(b)      The partners of Lord, Abbett & Co. are:

<TABLE>
<CAPTION>

         Name and Principal     Positions and Offices
         Business Address       with Registrant
         ----------------       ---------------
        <S>                    <C>
         Robert S. Dow          Chairman and President
         Robert I. Gerber       Executive Vice President
         Robert G. Morris       Executive Vice President
         Paul A. Hilstad        Vice President & Secretary
         Zane E. Brown          Vice President
         Daniel E. Carper       Vice President
         W. Thomas Hudson, Jr.  Vice President

</TABLE>

         The other general partners of Lord Abbett & Co. who are neither
         officers nor directors of the Registrant are Stephen Allen, John E.
         Erard, Robert P. Fetch, Daria L. Foster, Stephen J. McGruder, Michael
         McLaughlin, Robert J. Noelke, R. Mark Pennington, Christopher Towle and
         John J. Walsh.

         Each of the above has a principal business address at 767 Fifth Avenue,
         New York, NY 10153

(c)      Not applicable

Item 28. Location of Accounts and Records

         Registrant maintains the records, required by Rules 31a-1(a) and (b),
         and 31a-2(a) at its main office.

         Lord, Abbett & Co. maintains the records required by Rules 31a-1(f)
         and 31a-2(e) at its main office.

         Certain records such as correspondence may be physically maintained at
         the main office of the Registrant's Transfer Agent, Custodian, or
         Shareholder Servicing Agent within the requirements of Rule 31a-3.

Item 29. Management Services

         None.

                                        3







<PAGE>

<PAGE>


Item 30. Undertakings

(a)      The Registrant undertakes to furnish each person to whom a prospectus
         is delivered with a copy of the Registrant's latest annual report to
         shareholders, upon request and without charge.

(b)      The Registrant undertakes, if requested to do so by the holders of at
         least 10% of the registrant's outstanding shares, to call a meeting of
         shareholders for the purpose of voting upon the question of removal of
         a director or directors and to assist in communications with other
         shareholders as required by Section 16(c).

                                        4








<PAGE>

<PAGE>


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant had duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of New York, and State of New York on the 31th day of
March, 1999.

                                                  BY:  /s/ Lawrence H. Kaplan
                                                       ------------------------
                                                       Lawrence H. Kaplan
                                                       Vice President


                                            LORD ABBETT INVESTMENT TRUST









                                        5






<PAGE>

<PAGE>



         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

Signatures                                  Title                               Date
- ----------                                  -----                               ----

<S>                            <C>                                          <C>


                               Chairman, President
/s/ Robert S. Dow*               and Director/Trustee                        March 31, 1999
________________________       ____________________________                  ______________
Robert S. Dow


/s/ E. Thayer Bigelow*         Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
E. Thayer Bigelow


/s/ William H. T. Bush*        Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
William H. T. Bush


/s/ Robert B. Calhoun, Jr*.    Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
Robert B. Calhoun, Jr.


/s/ Stewart S. Dixon*          Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
Stewart S. Dixon


/s/ John C. Jansing*           Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
John C. Jansing


/s/ C. Alan MacDonald*         Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
C. Alan MacDonald


/s/ Hansel B. Millican, Jr*.   Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
Hansel B. Millican, Jr.


/s/ Thomas J. Neff*            Director/Trustee                              March 31, 1999
________________________       ____________________________                  ______________
Thomas J. Neff



</TABLE>


*BY:    /s/ Lawrence H. Kaplan
        ______________________
        Lawrence H. Kaplan
        Attorney-in-Fact




                                       6





                          STATEMENT OF DIFFERENCES
                          ------------------------

 The trademark symbol shall be expressed as............................. 'TM'



<PAGE>
 





<PAGE>
                                                                      EXHIBIT 11
 
CONSENT OF INDEPENDENT AUDITORS
 
Lord Abbett Investment Trust:
 
We consent to the incorporation by reference in Post-Effective Amendment No. 23
to Registration Statement No. 33-68090 of our reports dated January 8, 1999 for
Lord Abbett U.S. Government Securities Series, Lord Abbett Limited Duration U.S.
Government Securities Series, Lord Abbett Balanced Series and Lord Abbett Core
Fixed Income Series appearing in the Annual Reports to Shareholders for the year
ended November 30, 1998, and to the references to us under the caption
'Financial Highlights' in the Prospectus and under the captions 'Investment
Advisory and Other Services' and 'Financial Statements' appearing in the
Statement of Additional Information, both of which are part of such Registration
Statement.
 



DELOITTE & TOUCHE LLP
New York, New York
March 26, 1999


<PAGE>



<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        031
<NAME>                          BALANCED SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                       58,675,664
<INVESTMENTS-AT-VALUE>                      57,098,108
<RECEIVABLES>                                  446,530
<ASSETS-OTHER>                                 128,385
<OTHER-ITEMS-ASSETS>                           145,870
<TOTAL-ASSETS>                              57,818,893
<PAYABLE-FOR-SECURITIES>                       121,360
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       22,828
<TOTAL-LIABILITIES>                            144,188
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    53,955,843
<SHARES-COMMON-STOCK>                        3,471,843
<SHARES-COMMON-PRIOR>                        1,340,258
<ACCUMULATED-NII-CURRENT>                       50,780
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      3,090,225
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (1,577,556)
<NET-ASSETS>                                57,674,705
<DIVIDEND-INCOME>                            1,048,447
<INTEREST-INCOME>                              218,042
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  72,834
<NET-INVESTMENT-INCOME>                      1,193,655
<REALIZED-GAINS-CURRENT>                     3,090,748
<APPREC-INCREASE-CURRENT>                   (3,714,929)
<NET-CHANGE-FROM-OPS>                        2,900,612
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    1,149,118
<DISTRIBUTIONS-OF-GAINS>                       482,400
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,402,438
<NUMBER-OF-SHARES-REDEEMED>                    388,736
<SHARES-REINVESTED>                            117,883
<NET-CHANGE-IN-ASSETS>                      37,334,278
<ACCUMULATED-NII-PRIOR>                         28,799
<ACCUMULATED-GAINS-PRIOR>                      570,450
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          139,407
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                210,903
<AVERAGE-NET-ASSETS>                        27,881,363
<PER-SHARE-NAV-BEGIN>                            12.80
<PER-SHARE-NII>                                    .54
<PER-SHARE-GAIN-APPREC>                            .40
<PER-SHARE-DIVIDEND>                               .52
<PER-SHARE-DISTRIBUTIONS>                          .35
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.87
<EXPENSE-RATIO>                                    .26
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>




<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        032
<NAME>                          BALANCED SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                       58,675,664
<INVESTMENTS-AT-VALUE>                      57,098,108
<RECEIVABLES>                                  446,530
<ASSETS-OTHER>                                 128,385
<OTHER-ITEMS-ASSETS>                           145,870
<TOTAL-ASSETS>                              57,818,893
<PAYABLE-FOR-SECURITIES>                       121,360
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       22,828
<TOTAL-LIABILITIES>                            144,188
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    53,955,843
<SHARES-COMMON-STOCK>                          396,867
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                        3,822
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      3,090,225
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (1,577,556)
<NET-ASSETS>                                57,674,705
<DIVIDEND-INCOME>                               51,043
<INTEREST-INCOME>                                  226
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  11,847
<NET-INVESTMENT-INCOME>                         39,422
<REALIZED-GAINS-CURRENT>                     3,090,748
<APPREC-INCREASE-CURRENT>                   (3,714,929)
<NET-CHANGE-FROM-OPS>                        2,900,612
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       35,604
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        410,635
<NUMBER-OF-SHARES-REDEEMED>                     16,357
<SHARES-REINVESTED>                              2,589
<NET-CHANGE-IN-ASSETS>                      37,334,278
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            5,823
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 20,102
<AVERAGE-NET-ASSETS>                         1,995,654
<PER-SHARE-NAV-BEGIN>                            13.14
<PER-SHARE-NII>                                    .25
<PER-SHARE-GAIN-APPREC>                            .28
<PER-SHARE-DIVIDEND>                               .25
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.86
<EXPENSE-RATIO>                                    .59
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>




<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        033
<NAME>                          BALANCED SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                       58,675,664
<INVESTMENTS-AT-VALUE>                      57,098,108
<RECEIVABLES>                                  446,530
<ASSETS-OTHER>                                 128,385
<OTHER-ITEMS-ASSETS>                           145,870
<TOTAL-ASSETS>                              57,818,893
<PAYABLE-FOR-SECURITIES>                       121,360
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       22,828
<TOTAL-LIABILITIES>                            144,188
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    53,955,843
<SHARES-COMMON-STOCK>                          614,958
<SHARES-COMMON-PRIOR>                          249,784
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           9,445
<ACCUMULATED-NET-GAINS>                      3,090,225
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (1,577,556)
<NET-ASSETS>                                57,674,705
<DIVIDEND-INCOME>                              198,814
<INTEREST-INCOME>                               43,089
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  67,454
<NET-INVESTMENT-INCOME>                        174,449
<REALIZED-GAINS-CURRENT>                     3,090,748
<APPREC-INCREASE-CURRENT>                   (3,714,929)
<NET-CHANGE-FROM-OPS>                        2,900,612
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      156,346
<DISTRIBUTIONS-OF-GAINS>                        88,565
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        417,362
<NUMBER-OF-SHARES-REDEEMED>                     70,625
<SHARES-REINVESTED>                             18,437
<NET-CHANGE-IN-ASSETS>                      37,334,278
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                      570,450
<OVERDISTRIB-NII-PRIOR>                         12,076
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           26,906
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                110,354
<AVERAGE-NET-ASSETS>                         5,381,129
<PER-SHARE-NAV-BEGIN>                            12.78
<PER-SHARE-NII>                                    .41
<PER-SHARE-GAIN-APPREC>                            .40
<PER-SHARE-DIVIDEND>                               .39
<PER-SHARE-DISTRIBUTIONS>                          .35
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.85
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

<PAGE>




<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        021
<NAME>                          LIMITED DURATION US GOVERNMENT SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                       11,038,890
<INVESTMENTS-AT-VALUE>                      11,318,039
<RECEIVABLES>                                3,242,216
<ASSETS-OTHER>                               1,899,728
<OTHER-ITEMS-ASSETS>                           185,330
<TOTAL-ASSETS>                              16,645,313
<PAYABLE-FOR-SECURITIES>                     5,593,035
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       52,472
<TOTAL-LIABILITIES>                          5,645,507
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    12,674,972
<SHARES-COMMON-STOCK>                        1,078,737
<SHARES-COMMON-PRIOR>                        1,098,742
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          74,415
<ACCUMULATED-NET-GAINS>                     (1,744,811)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       279,148
<NET-ASSETS>                                10,999,806
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              337,782
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  24,353
<NET-INVESTMENT-INCOME>                        313,429
<REALIZED-GAINS-CURRENT>                        39,648
<APPREC-INCREASE-CURRENT>                       60,289
<NET-CHANGE-FROM-OPS>                          623,837
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      292,470
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,524,406
<NUMBER-OF-SHARES-REDEEMED>                  1,392,054
<SHARES-REINVESTED>                             47,643
<NET-CHANGE-IN-ASSETS>                         723,585
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                   (1,784,459)
<OVERDISTRIB-NII-PRIOR>                         94,187
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           26,735
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 51,450
<AVERAGE-NET-ASSETS>                         5,347,032
<PER-SHARE-NAV-BEGIN>                             4.40
<PER-SHARE-NII>                                    .26
<PER-SHARE-GAIN-APPREC>                            .04
<PER-SHARE-DIVIDEND>                               .24
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               4.46
<EXPENSE-RATIO>                                    .46
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>



<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        023
<NAME>                          LIMITED DURATION US GOVERNMENT SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                       11,038,890
<INVESTMENTS-AT-VALUE>                      11,318,039
<RECEIVABLES>                                3,242,216
<ASSETS-OTHER>                               1,899,728
<OTHER-ITEMS-ASSETS>                           185,330
<TOTAL-ASSETS>                              16,645,313
<PAYABLE-FOR-SECURITIES>                     5,593,035
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       52,472
<TOTAL-LIABILITIES>                          5,645,507
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    12,674,972
<SHARES-COMMON-STOCK>                        1,185,415
<SHARES-COMMON-PRIOR>                        1,235,919
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         125,960
<ACCUMULATED-NET-GAINS>                     (1,744,811)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       279,148
<NET-ASSETS>                                10,999,806
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              267,669
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  57,167
<NET-INVESTMENT-INCOME>                        210,502
<REALIZED-GAINS-CURRENT>                        39,648
<APPREC-INCREASE-CURRENT>                       60,289
<NET-CHANGE-FROM-OPS>                          623,837
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      192,017
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        709,733
<NUMBER-OF-SHARES-REDEEMED>                    785,920
<SHARES-REINVESTED>                             25,683
<NET-CHANGE-IN-ASSETS>                         723,585
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                   (1,784,459)
<OVERDISTRIB-NII-PRIOR>                        145,555
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           21,295
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 78,962
<AVERAGE-NET-ASSETS>                         4,258,808
<PER-SHARE-NAV-BEGIN>                             4.40
<PER-SHARE-NII>                                    .22
<PER-SHARE-GAIN-APPREC>                            .05
<PER-SHARE-DIVIDEND>                               .20
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               4.47
<EXPENSE-RATIO>                                   1.34
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        



<PAGE>



<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        011
<NAME>                          US GOVERNMENT SECURITIES SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                    2,183,428,139
<INVESTMENTS-AT-VALUE>                   2,224,340,799
<RECEIVABLES>                              495,015,832
<ASSETS-OTHER>                             168,136,567
<OTHER-ITEMS-ASSETS>                            13,935
<TOTAL-ASSETS>                           2,887,507,133
<PAYABLE-FOR-SECURITIES>                   971,076,125
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   14,026,753
<TOTAL-LIABILITIES>                        985,102,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,425,978,692
<SHARES-COMMON-STOCK>                      648,149,209
<SHARES-COMMON-PRIOR>                      804,678,136
<ACCUMULATED-NII-CURRENT>                   13,097,755
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                   (572,619,975)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    40,912,660
<NET-ASSETS>                             1,902,404,255
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          133,910,370
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              17,211,567
<NET-INVESTMENT-INCOME>                    116,698,803
<REALIZED-GAINS-CURRENT>                    42,447,914
<APPREC-INCREASE-CURRENT>                    4,102,771
<NET-CHANGE-FROM-OPS>                      174,973,519
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  121,519,231
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     31,799,161
<NUMBER-OF-SHARES-REDEEMED>                212,324,614
<SHARES-REINVESTED>                         23,996,526
<NET-CHANGE-IN-ASSETS>                    (384,007,693)
<ACCUMULATED-NII-PRIOR>                     17,080,469
<ACCUMULATED-GAINS-PRIOR>                 (615,067,889)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        9,173,347
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             17,555,806
<AVERAGE-NET-ASSETS>                     1,834,669,495
<PER-SHARE-NAV-BEGIN>                             2.59
<PER-SHARE-NII>                                    .17
<PER-SHARE-GAIN-APPREC>                            .05
<PER-SHARE-DIVIDEND>                               .17
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.64
<EXPENSE-RATIO>                                    .94
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        



<PAGE>



<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        012
<NAME>                          U.S. GOVERNMENT SECURITIES SERIES - CLASS B
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                    2,183,428,139
<INVESTMENTS-AT-VALUE>                   2,224,340,799
<RECEIVABLES>                              495,015,832
<ASSETS-OTHER>                             168,136,567
<OTHER-ITEMS-ASSETS>                            13,935
<TOTAL-ASSETS>                           2,887,507,133
<PAYABLE-FOR-SECURITIES>                   971,076,125
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   14,026,753
<TOTAL-LIABILITIES>                        985,102,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,425,978,692
<SHARES-COMMON-STOCK>                       11,100,263
<SHARES-COMMON-PRIOR>                        5,496,872
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         113,265
<ACCUMULATED-NET-GAINS>                   (572,619,975)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    40,912,660
<NET-ASSETS>                             1,902,404,255
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            1,309,064
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 307,596
<NET-INVESTMENT-INCOME>                      1,001,468
<REALIZED-GAINS-CURRENT>                    42,447,914
<APPREC-INCREASE-CURRENT>                    4,102,771
<NET-CHANGE-FROM-OPS>                      174,973,519
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    1,432,091
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      7,509,963
<NUMBER-OF-SHARES-REDEEMED>                  2,095,473
<SHARES-REINVESTED>                            188,901
<NET-CHANGE-IN-ASSETS>                    (384,007,693)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                 (615,067,889)
<OVERDISTRIB-NII-PRIOR>                         36,856
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           93,429
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                308,272
<AVERAGE-NET-ASSETS>                        18,685,855
<PER-SHARE-NAV-BEGIN>                             2.58
<PER-SHARE-NII>                                    .14
<PER-SHARE-GAIN-APPREC>                            .08
<PER-SHARE-DIVIDEND>                               .16
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.64
<EXPENSE-RATIO>                                   1.65
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>




<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        013
<NAME>                          U.S. GOVERNMENT SECURITIES SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-01-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                    2,183,428,139
<INVESTMENTS-AT-VALUE>                   2,224,340,799
<RECEIVABLES>                              495,015,832
<ASSETS-OTHER>                             168,136,567
<OTHER-ITEMS-ASSETS>                            13,935
<TOTAL-ASSETS>                           2,887,507,133
<PAYABLE-FOR-SECURITIES>                   971,076,125
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                   14,026,753
<TOTAL-LIABILITIES>                        985,102,878
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,425,978,692
<SHARES-COMMON-STOCK>                       60,767,078
<SHARES-COMMON-PRIOR>                       73,646,340
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         502,344
<ACCUMULATED-NET-GAINS>                   (572,619,975)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    40,912,660
<NET-ASSETS>                             1,902,404,255
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           12,381,835
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               2,726,794
<NET-INVESTMENT-INCOME>                      9,655,041
<REALIZED-GAINS-CURRENT>                    42,447,914
<APPREC-INCREASE-CURRENT>                    4,102,771
<NET-CHANGE-FROM-OPS>                       74,973,519
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    9,773,665
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      7,523,887
<NUMBER-OF-SHARES-REDEEMED>                 22,360,867
<SHARES-REINVESTED>                          1,957,718
<NET-CHANGE-IN-ASSETS>                    (384,007,693)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                 (615,067,889)
<OVERDISTRIB-NII-PRIOR>                        259,315
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          848,486
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,734,864
<AVERAGE-NET-ASSETS>                       169,697,111
<PER-SHARE-NAV-BEGIN>                             2.59
<PER-SHARE-NII>                                    .15
<PER-SHARE-GAIN-APPREC>                            .06
<PER-SHARE-DIVIDEND>                               .15
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.65
<EXPENSE-RATIO>                                   1.61
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        



<PAGE>



<TABLE> <S> <C>

<ARTICLE>                       6
<CIK>                           0000911507
<NAME>                          LORD ABBETT INVESTMENT TRUST
<SERIES>
<NUMBER>                        045
<NAME>                          CORE SERIES - CLASS Y
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1998
<PERIOD-START>                             DEC-10-1997
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                        5,719,719
<INVESTMENTS-AT-VALUE>                       5,785,071
<RECEIVABLES>                                1,747,660
<ASSETS-OTHER>                                 278,634
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               7,811,365
<PAYABLE-FOR-SECURITIES>                     3,111,623
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        5,601
<TOTAL-LIABILITIES>                          3,117,224
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     4,284,885
<SHARES-COMMON-STOCK>                          427,854
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                      264,059
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         79,846
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        65,352
<NET-ASSETS>                                 4,694,141
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              264,059
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                       0
<NET-INVESTMENT-INCOME>                        264,059
<REALIZED-GAINS-CURRENT>                        79,846
<APPREC-INCREASE-CURRENT>                       65,352
<NET-CHANGE-FROM-OPS>                          409,257
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        427,854
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                       4,694,151
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           21,264
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 31,090
<AVERAGE-NET-ASSETS>                         4,302,386
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                    .62
<PER-SHARE-GAIN-APPREC>                            .35
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.97
<EXPENSE-RATIO>                                      0
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


<PAGE>




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