LORD ABBETT DEVELOPING GROWTH FUND INC /NEW/
497, 2000-03-13
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Lord Abbett

Developing Growth Fund

Prospectus

June 1, 1999

(As Revised August 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.


<PAGE>

                               Table of Contents

The Fund                                                                  Page


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


                              Your Investment


        Information for managing      Purchases                           5
               your fund account      Opening Your Account                7
                                      Redemptions                         8
                                      Distributions and Taxes             8
                                      Services For Fund Investors         9
                                      Sales Charges and Service Fees     10
                                      Management                         10


                         For More Information


               How to learn more      Other Investment Techniques        11
                  about the fund      Glossary of Shaded Terms           11
                                      Recent Performance                 13


                         Financial Information


                                      Financial Highlights               14
                                      Compensation For Your Dealer       16


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

GOAL/STRATEGY

     The fund seeks capital appreciation. It does this by investing primarily in
     the common stocks of small companies with exciting prospects, strong
     management, and aboveaverage, long-term growth potential. The fund uses a
     bottom-up stock selection process, which means that it focuses on the
     investment fundamentals of companies, rather than reacting to market
     events. Normally, the fund invests at least 65% of its total assets in
     securities of small companies.

     The fund tries to identify companies that are in the developing growth
     phase. This is a period of swift development when growth occurs at a rate
     rarely equaled by established companies in their mature years. The fund
     focuses on companies that it believes are strongly positioned in this
     phase. Of course, because the actual growth of a company cannot be
     foreseen, Lord Abbett may not always be correct in its judgments about
     which phase a company is in.

     While typically fully invested, we may take a temporary defensive position
     in cash and short-term debt securities. This could prevent the fund from
     realizing its investment objective.

MAIN RISKS

     Although small-company stocks offer significant appreciation potential,
     they generally carry more risk than larger companies. Generally, small
     companies rely on limited product lines and markets, financial resources,
     or other factors, and may lack management depth or experience. This may
     make them more susceptible to setbacks or economic downturns.

     Small-company stocks tend to be more volatile in price, have fewer shares
     outstanding and trade less frequently than other stocks. Therefore,
     small-company stocks often are subject to wider price fluctuations. Many
     small-company stocks are traded over the counter and are not traded in the
     volume typical of stocks listed on a national securities exchange.

     An investment in the fund is not a bank deposit. It is not FDIC insured or
     governmentendorsed. It is not a complete investment program. You could lose
     money in this fund.

We or the fund refers to Lord Abbett Developing Growth Fund, Inc., which
operates under the supervision of its Board with the advice of Lord, Abbett &
Co. ("Lord Abbett"), its investment manager.

About the fund. This 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 mutual funds, it cannot guarantee
results.

Growth stocks are stocks which exhibit faster-than-average gains in earnings and
are expected to continue profit growth at a high level, but also tend to be more
volatile than bargain stocks.

Small-Company stocks are stocks of smaller companies which often are new and
less established, with a tendency to be faster-growing but more volatile than
large-company stocks.

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 Fund
<PAGE>




                            Developing Growth Fund      Symbols: Class A -LAGWX
                                                                 Class B -LADBX
                                                                 Class C -LADCX

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. The
     returns shown do not reflect fund fees and expenses. The deduction of such
     fees and expenses (and the compounding effect thereof over time) may reduce
     the investors' return. Past performance is not a prediction of future
     results.

[GRAPHIC OMITTED]

Best Quarter: 1st Q '91   29.96%
Worst Quarter: 3rd Q '90 (24.62)%

     The table below shows a comparison of the fund's class A, B and C average
     annual total return to that of a broad measure of market performance, as
     represented by the Russell 2000 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.

Class              1 Year   5 Years    10 Years Inception (i)  Russell 2000 (ii)

A                   2.00%    20.32%     16.48%      12.53%           --
- --------------------------------------------------------------------------------
B                   3.20%     --         --         19.84%          14.21% (iii)
- --------------------------------------------------------------------------------
C                   7.57%     --         --         21.42%          14.21% (iv)
- --------------------------------------------------------------------------------
P                     --      --         --          7.80%         (0.98)% (v)
- --------------------------------------------------------------------------------
Russell 2000 Index (2.55)%   11.87%     12.92%       --             --
- --------------------------------------------------------------------------------

(i)  The dates of inception of each class are: A -10/10/73; B -8/1/96; C -8/1/96
     and P -1/5/98.

(ii) Performance for the unmanaged Russell 2000 Index does not reflect
     transaction costs or management fees.

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

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

(v)  Represents total returns for the period 1/31/98 to 12/31/98, to correspond
     with class P inception date.

                                                                      The Fund 3
<PAGE>

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
- ------------------------------------------------------------------------------------------------
Shareholder Fees (Fees paid directly from your investment) Class A  Class B   Class C   Class P
- ------------------------------------------------------------------------------------------------
<S>                                                      <C>      <C>         <C>        <C>
Maximum Sales Charge on Purchases
- ------------------------------------------------------------------------------------------------
(as a % of offering price)                              5.75%    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)
- ------------------------------------------------------------------------------------------------
Management Fees (See "Management")                      0.53%       0.53%        0.53%     0.53%
- ------------------------------------------------------------------------------------------------
Distribution and Service (12b-1) Fees (2)(3)            0.35%       1.00%        1.00%     0.45%
- ------------------------------------------------------------------------------------------------
Other Expenses                                          0.19%       0.19%        0.19%     0.19%
- ------------------------------------------------------------------------------------------------
Total Operating Expenses                                1.07%       1.72%        1.72%     1.17%
- ------------------------------------------------------------------------------------------------
</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.

Share class           1 Year       3 Years          5 Years           10 Years
Class A shares         $657          $830           $1,019             $1,566
- --------------------------------------------------------------------------------
Class B shares         $652          $774           $1,018             $1,617
- --------------------------------------------------------------------------------
Class C shares         $252          $474           $  818             $1,793
- --------------------------------------------------------------------------------
Class P shares        $  97          $302           $  526             $1,169
- --------------------------------------------------------------------------------
You would pay the following expenses on the same investment,
assuming you kept your shares.
- --------------------------------------------------------------------------------
Class A shares         $657          $830           $1,019             $1,566
- --------------------------------------------------------------------------------
Class B shares         $152          $474           $  818             $1,617
- --------------------------------------------------------------------------------
Class C shares         $152          $474           $  818             $1,793
- --------------------------------------------------------------------------------
Class P shares        $  97          $302           $  526             $1,169
- --------------------------------------------------------------------------------

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 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
     shareholder services and professional fees.

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

(2)  The Distribution and Service Fees 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.

4 The Fund

<PAGE>


                                Your Investment

PURCHASES

     This prospectus offers four classes of shares, class A, B, C and P.
     Although the fund has more than one class of shares, these different
     classes of shares represent investments in the same portfolio of securities
     but are subject to different sales charges and 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
- --------------------------------------------------------------------------------
                                                             To Compute
                      As a % of            As a % of        Offering Price
 Your Investment    Offering Price      Your Investment     Divide NAV by
- --------------------------------------------------------------------------------
 Less than $50,000       5.75%               6.10%              .9425
- --------------------------------------------------------------------------------
 $50,000 to $99,999      4.75%               4.99%              .9525
- --------------------------------------------------------------------------------
 $100,000 to $249,999    3.95%               4.11%              .9605
- --------------------------------------------------------------------------------
 $250,000 to $499,999    2.75%               2.83%              .9725
- --------------------------------------------------------------------------------
 $500,000 to $999,999    1.95%               1.99%              .9805
- --------------------------------------------------------------------------------
$1,000,000 and over           No Sales Charge                  1.0000
- --------------------------------------------------------------------------------

     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"). 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 frontend 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


                                                               Your Investment 5
<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
          Abbettsponsored 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 under Retirement Plans such as 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
- --------------------------------------------------------------------------------

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

(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 employersponsored 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 CDSC 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."


6 Your Investment
<PAGE>


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

          benefit payments under Retirement Plans such as 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" 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.

     Lord Abbett
     Developing Growth Fund, Inc.
     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. When purchases are made by
     check, redemptions will not be allowed until the fund or transfer agent is
     advised that the check has cleared, which may take up to 15 calendar days.
     For more information regarding proper form of a purchase order, call the
     fund at 800-821-5129.

     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.

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.

                                                               Your Investment 7
<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. Under unusual circumstances, the
     fund may suspend redemptions, or postpone payment for more than seven days,
     as permitted by federal securities laws.

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

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.



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 such income dividends to shareholders annually. 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.

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

- --------------------------------------------------------------------------------
Federal Taxability Of Distributions

Type of             Tax rate for taxpayer     Tax rate for taxpayer subject
distribution        subject to 15% bracket    to 28% bracket or above
- --------------------------------------------------------------------------------
Income              Ordinary                  Ordinary
dividends           income rate               income rate
- --------------------------------------------------------------------------------
Short-term          Ordinary                  Ordinary
capital gains       income rate               income rate
- --------------------------------------------------------------------------------
Long-term
capital gains        10%                       20%
- --------------------------------------------------------------------------------

     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.

Taxes on Transactions. The chart at left also can provide a "rule of thumb"
guide for your potential U. S. federal income tax liability when selling or
exchanging fund shares. The second row, "Shortterm 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.

8 Your Investment
<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) into your fund
(Dollar-cost        account by means of automatic money transfers from your bank checking
averaging)          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 funds. Automatic
Withdrawal          cash withdrawals can be paid to you from your account in fixed or variable
Plan ("SWP")        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 SWP 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
                    SWP 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 shares will be
C shares            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.

     Exchanges. You or your investment professional can instruct your fund to
     exchange shares of any class for shares of the same class of any Eligible
     Fund. Instruction may be provided in writing or by telephone, with proper
     identification, 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.

Exchange Limitations. Exchanges should not be used to try to take advantage of
short-term swings in the market. Frequent exchanges create higher expenses for
the fund. Accordingly, the fund reserves the right to limit or terminate this
privilege for any shareholder making frequent exchanges or abusing the
privilege. The fund also may revoke the privilege for all shareholders upon 60
days' written notice.

                                                               Your Investment 9
<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 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 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.


12b-1 fees 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, the 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.


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 over $32 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 average daily net assets
     for each month. For the fiscal year ended January 31, 1999, the fee paid to
     Lord Abbett was at an annual rate of .53 of 1%. 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. Stephen J. McGruder, Partner of Lord
     Abbett, heads the team , the other senior members of which include
     Lesley-Jane Dixon, Rayna Lesser and Cinda Hughes. Mr. McGruder and Ms.
     Dixon have been with Lord Abbett since 1995, Ms. Lesser has been with Lord
     Abbett since 1996 and Ms. Hughes since 1998. Prior to joining Lord Abbett,
     Mr. McGruder was a portfolio manager with Wafra Investment Advisory Group.
     Ms. Dixon was an equity analyst with Wafra Investment Advisory Group before
     joining Lord Abbett. Ms. Lesser joined Lord Abbett directly from Barnard
     College. Ms. Hughes was an Analyst/ Director of Equity Research at Phoenix
     Investment Counsel and an Associate Strategist at Paine Webber,
     Inc./Kidder, Peabody & Co. before joining Lord Abbett.

10  Your Investment
<PAGE>


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 financial futures and options on financial
     futures. The fund may use these transactions to change the risk and return
     characteristics of the 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. The fund is a diversified fund. This 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. U. S. Government Securities
     are not subject to these requirements.

     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 trade on days when
     an underlying 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; nondeductible withholding taxes and different accounting and
     settlement practices. The fund may invest up to 10% of its assets at the
     time of investment in foreign securities.

     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 a fund's
     securities if the borrower defaults. The fund will limit its loans to 30%
     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.

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

For More Information 11
<PAGE>


     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 a fund is not offered
     for sale; (2) Lord Abbett Equity Fund; (3) Lord Abbett Series Fund; (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 Authori zed 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. 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) 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


Guaranteed signature. An acceptable
form of guarantee would be

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

            [SIGNATURE ILLEGIBLE]
- --------------------------------------------------
                            AUTHORIZED SIGNATURE
(960)                            X 9 6 0 3 4 7 0
SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'sm'
                                              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

            [SIGNATURE ILLEGIBLE]
- --------------------------------------------------
                            AUTHORIZED SIGNATURE
(960)                            X 9 6 0 3 4 7 0
SECURITIES TRANSFER AGENTS MEDALLION PROGRAM'sm'
                                              SR



12  For More Information
<PAGE>


     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

     Small-cap investors saw positive returns early on in the fund's fiscal year
     erased by a sharp third-quarter downturn. This downturn was caused in part
     by a "flight to quality" stemming from international monetary and economic
     crises as well as political problems that led investors to seek more liquid
     investments, such as larger-company stocks and higher-quality bonds. While
     all major asset classes of the U. S. equity market experienced weakness
     during the third quarter of 1998, small-cap equities had the lowest
     returns.

     The month of October, however, saw some price recovery for small-cap stocks
     after August's severe declines. The October upswing turned out to be a
     harbinger of extremely strong performance during the entire fourth quarter
     as economic and political uncertainties that had previously affected
     investor confidence subsided and a more optimistic outlook emerged. Key to
     this turnaround was the Federal Reserve Board's decisive move to lower U.
     S. interest rates through a series of autumn rate cuts.

     Most sectors of the U. S. equity market participated in the fourth quarter
     upswing. However, as the market reached its previous highs, certain
     sectors, such as technology and consumer non-cyclicals, that had provided
     price leadership earlier on, once again moved ahead of the broad market. In
     addition, large-cap stocks continued to outperform mid- and small-cap
     investments.

     Our focus on bottom-up stock selection allowed the fund to overcome
     industry-specific difficulties throughout most of the period under review.
     Our strategy and philosophy remain constant. We concentrate on selecting
     those companies that we believe will offer our investors superior long-term
     stock price appreciation regardless of industry-specific problems or
     large-scale economic trends.

     In our view, the current backdrop of growth in the economy, low levels of
     inflation and interest rates, paired with adequate liquidity supported by
     Federal Reserve policy, should enable the U. S. equity market to show
     progress in the next year. However, a slowing U. S. economy could spur
     small-cap price volatility due to lower corporate earnings and employment
     growth. We believe our focus on identifying financially strong companies
     that can be purchased at attractive prices will help the fund to uncover
     exciting investment opportunities even during a slowing economy. Since
     small-cap stocks remain significantly undervalued with respect to relative
     earnings versus large-caps, we also expect that a period of strong relative
     performance by small-caps is likely during 1999.

Year 2000 Issues. The fund could be adversely affected if the computers used by
the 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 13
<PAGE>

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 January 31, 1999 and the
     Independent Auditors' Report thereon appear in the Annual Report to
     Shareholders for the fiscal year ended January 31, 1999 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 January 31,

Per Share Operating Performance:              1999                1998                1997                 1996              1995
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>                 <C>                 <C>                   <C>              <C>
Net asset value, beginning of year          $14.27              $12.80              $11.49                $9.58            $10.65
- ------------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations
- ------------------------------------------------------------------------------------------------------------------------------------
Net investment loss                           (.07) (a)           (.10) (a)           (.03)                (.02)             (.04)
- ------------------------------------------------------------------------------------------------------------------------------------
Net realized and unrealized
- ------------------------------------------------------------------------------------------------------------------------------------
 gain (loss) on investments                   2.10                3.16                3.12                 4.80              (.22)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from investment operations              2.03                3.06                3.09                 4.78              (.26)
- ------------------------------------------------------------------------------------------------------------------------------------
Distributions
- ------------------------------------------------------------------------------------------------------------------------------------
 Distributions from net realized gain         (.05)              (1.59)              (1.78)               (2.87)             (.81)
- ------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of year                $16.25              $14.27              $12.80               $11.49             $9.58
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return (b)                             14.24%              24.38%              28.35%               50.22%            (2.74)%
- ------------------------------------------------------------------------------------------------------------------------------------
Ratios to Average Net Assets:
- ------------------------------------------------------------------------------------------------------------------------------------
 Expenses                                     0.98% (e)           1.06%               1.10%                1.03%             1.31%
- ------------------------------------------------------------------------------------------------------------------------------------
 Net investment loss                         (0.46)%             (0.72)%             (0.67)%              (0.52)%           (0.38)%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>

                                                 Class B Shares                          Class C Shares            Class P Shares
                                           ---------------------------           ------------------------     ----------------------
                                             Year Ended January 31,                Year Ended January 31,     Year Ended January 31,
Per Share Operating Performance:         1999         1998     1997 (d)      1999       1998       1997 (d)  1999         1998 (d)

<S>                                     <C>         <C>       <C>          <C>         <C>         <C>        <C>        <C>
Net asset value, beginning of period    $14.12      $12.75    $12.14       $14.13      $12.75      $12.14     $14.26     $14.38
- ------------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations
- ------------------------------------------------------------------------------------------------------------------------------------
 Net investment loss                      (.17)a)   (.20)(a)    (.05)        (.17)(a)    (.19)(a)    (.05)      (.10)(a)   (.01)(a)
- ------------------------------------------------------------------------------------------------------------------------------------
 Net realized and unrealized
- ------------------------------------------------------------------------------------------------------------------------------------
  gain (loss) on investments              2.06        3.14      2.28         2.07        3.14        2.28       2.08       (.11)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from investment operations          1.89        2.94      2.23         1.90        2.95        2.23       1.98       (.12)
- ------------------------------------------------------------------------------------------------------------------------------------
Distributions
- ------------------------------------------------------------------------------------------------------------------------------------
 Distributions from net realized gain     (.03)      (1.57)    (1.62)        (.03)      (1.57)      (1.62)       (.05)     --
- ------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period          $15.98      $14.12    $12.75       $16.00       $14.13     $12.75      $16.19     $14.26
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return (b)                         13.37%       23.48%    19.43%(c)    13.43%      23.55%     19.43%(c)   13.89%    (0.83)%(c)
- ------------------------------------------------------------------------------------------------------------------------------------
Ratios to Average Net Assets:
- ------------------------------------------------------------------------------------------------------------------------------------
 Expenses                                 1.72% (e)    1.76%     0.93%(c)     1.72%(e)   1.71%       0.93%(c)    1.17%(e)  0.08%(c)
- ------------------------------------------------------------------------------------------------------------------------------------
 Net investment loss                     (1.19)%      (1.39)%  (0.73)%(c)    (1.20)%    (1.34)%     (0.73)%(c) (0.70)%    (0.05)%(c)
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>

                                                                               Year Ended January 31,
Supplemental Data For All Classes:                1999               1998                 1997              1996            1995
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>                  <C>                 <C>               <C>              <C>
Net assets, end of year (000)                 $1,344,203           $553,086            $330,358          $197,602         $127,579
- ------------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                          30.89%             33.60%               42.35%            50.12%          17.57%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

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

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

(c)  Not annualized.

(d)  Commencement of offering respective class shares: B -August 1, 1996, C
     -August 1, 1996 and P -January 5, 1998.

(e)  The ratios for 1999 include expenses paid through an expense offset
     arrangement.

14   Financial Information
<PAGE>

LINE GRAPH COMPARISON

     Immediately below is a comparison of a $10,000 investment in class A shares
     to the same investment in the Russell 2000 Index, assuming reinvestment of
     all dividends and distributions.

[GRAPHIC OMITTED]

       Average Annual Total Return With Maximum Sales Charge
                 For The Periods Ending January 31, 1999

                        1 Year        5 Years         10 Years        Life

Class A (3)              7.60%         20.22%           16.53%         12.69%
- --------------------------------------------------------------------------------
Class B (4)              8.37%          --               --            21.93%
- --------------------------------------------------------------------------------
Class C (5)             12.43%          --               --            22.88%
- --------------------------------------------------------------------------------
Class P (6)             13.89%          --               --            12.95%
- --------------------------------------------------------------------------------


(1)  Reflects the deduction of the maximum initial sales charge of 5.75%.

(2)  Performance for the unmanaged Russell 2000 Index does not reflect
     transaction costs, management fees or sales charges.

(3)  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
     January 31, 1999 using the SEC-required uniform method to compute such
     return.

(4)  The class B shares commenced operations on August 1, 1996. Performance
     reflects the deduction of a CDSC of 5% (for 1 year) and 3% (for life of the
     class).

(5)  The class C shares commenced operations on August 1, 1996. Performance
     reflects the deduction of a CDSC of 1% (for 1 year) and 0% (for life of the
     class).

(6)  The class P shares commenced operations on January 5, 1998. Performance is
     at net asset value.



                                                        Financial Information 15
<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                         3.95%                         3.25%                0.25%                  3.49%
- ------------------------------------------------------------------------------------------------------------------------------------
  $250,000 -$499,999                         2.75%                         2.25%                0.25%                  2.49%
- ------------------------------------------------------------------------------------------------------------------------------------
  $500,000 -$999,999                         1.95%                         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) (4)
- ------------------------------------------------------------------------------------------------------------------------------------
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%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>


                                             ANNUAL COMPENSATION AFTER FIRST YEAR

Class A investments
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                                      <C>                  <C>                    <C>
All amounts                        no front-end sales charge             none                   0.25%                  0.25%
- ------------------------------------------------------------------------------------------------------------------------------------
Class B investments                                                       Percentage of average net assets (5)
- ------------------------------------------------------------------------------------------------------------------------------------
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
- ------------------------------------------------------------------------------------------------------------------------------------
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 and for class A
     shares may not exceed 0.15% if sold prior to June 1, 1990. 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)  Class C shares of the fund may be purchased under a Mutual Fund Advisory
     Program, in which case, an alternative method of payment may be made
     quarterly on average net assets, on a pro-rata basis, during the first year
     subsequent to the purchase of shares, excluding dividend and distribution
     reinvestments. After the first year, payments with respect to C shares
     under a Mutual Fund Advisory Program follow the chart above as set forth
     under "Annual Compensation After First Year."

(5)  With respect to class B, C and P shares, 0.25% and 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.

 16   Financial Information
<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 funds'
     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).

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
90 Hudson Street
Jersey City, NJ 07302-3973

Via the Internet.
Lord, Abbett & Co.
www.lordabbett.com

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

You can also obtain copies by visiting the SEC's Public Reference Room in
Washington, DC (phone 202-942-8090) or by sending your request and a duplicating
fee to the SEC's Public Reference Section, Washington, DC 20549-6009 or by
sending your request electronically to
[email protected]


Lord Abbett Developing Growth Fund, Inc.
90 Hudson Street
Jersey City, NJ 07302-3973

- -----------------------
SEC file number: 811-2871

LADG-1-699
(6/99)




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