LORD ABBETT INVESTMENT TRUST
485APOS, 1997-12-31
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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]
                       Post-Effective Amendment No. 13                [X]
                                       And

           REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT    [X]
                                     OF 1940
                              Amendment No. 12                        [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

                   Paul A. Hilstad, Vice President & 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) of Rule 485
- ------

         on (date) pursuant to paragraph (b) of Rule 485
- ------

         60 days after filing pursuant to paragraph (a) (1) of Rule 485
- ------

         on (date) pursuant to paragraph (a) (1) of Rule 485
- ------

   X     75 days after filing pursuant to paragraph (a) (2) of Rule 485
- ------

         on (date) pursuant to paragraph (a)(3) 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
<PAGE>

                          LORD ABBETT INVESTMENT TRUST
                                      N-1A
                              Cross Reference Sheet
                         Post-Effective Amendment No. 13
                             Pursuant to Rule 481(a)

                                EXPLANATORY NOTE

This  Post-Effective  Amendment  No. 13 (the  "Amendment")  to the  Registrant's
Registration statement relates to the Core Series of the Registrant.

The other series of shares of the Registrant are listed below and are offered by
the  Prospectus in Part A of the  Post-Effective  Amendment to the  Registrant's
Registration Statement as identified below. The following are separate series of
the Registrant. This Amendment does not relate to, amend or otherwise affect the
Prospectuses contained in the prior Post-Effective  Amendments,  and pursuant to
Rule 485(d) under the Securities Act of 1933, does not affect the  effectiveness
of such Post-Effective Amendments.

Post-Effective Amendment No. 11
 
         Limited Duration Government Series
         Balanced Series
         U.S. Government Securities Series

Post-Effective Amendment No. 12

         Strategic Core Series

Form N-1A                  Location In Prospectus or
Item No.                   Statement of Additional Information

1                          Cover Page
2                          Fee Table
3                          N/A
4 (a) (i)                  Cover Page
4 (a) (ii)                 Investment Objectives
4 (b) (c)                  How We Invest
5 (a) (b) (c)              Our Management; Last Page
5 (d)                      N/A
5 (e)                      Our Management
5 (f)                      N/A
5 (g)                      Purchases
6 (a)                      Cover Page
6 (b)  (c) (d)             N/A
6 (e)                      Cover Page; Purchases
6 (f)  (g)                 Dividends, Capital Gains
                           Distributions and Taxes
7 (a)                      Back Cover Page
7 (b) (c) (d)              Purchases

<PAGE>

Form N-1A                Location In Prospectus or
Item No.                 Statement of Additional Information


8 (a)  (b) (c) (d)         Redemptions
                           Purchases, Redemptions and Shareholder Services
9                          N/A
10                         Cover Page
11                         Cover Page -- Table of Contents
12                         N/A
13 (a)  (b) (c) (d)        Investment Objectives and Policies
14                         Trustees and Officers
15 (a)  (b) (c)            Trustees and Officers
16 (a) (i)                 Investment Advisory and Other
                           Services
16 (a) (ii)                Trustees and Officers
16 (a) (iii)               Investment Advisory and Other
                           Services
16 (b)                     Investment Advisory and Other Services
16 (c)  (d) (e) (g)        N/A
16 (f)                     Purchases, Redemptions and Shareholder Services
16 (h)                     Investment Advisory and Other Services
16 (i)                     N/A
17 (a)                     Portfolio Transactions
17 (b)                     N/A
17 (c)                     Portfolio Transactions
17 (d) (e)                 N/A
18 (a)                     Cover Page
18 (b)                     N/A
19 (a) (b)                 Purchases; Redemptions and Shareholder Services;
                           Notes to Financial Statements
19 (c)                     N/A
20                         Taxes
21 (a)                     Purchases, Redemptions and Shareholder Services
21 (b) (c)                 N/A
22                         N/A
22 (b)                     Past Performance
23                         Financial Statements; Supplementary

<PAGE>
LORD ABBETT
INVESTMENT TRUST
The General Motors Building
767 Fifth Avenue
New York, NY 10153-0203
800-426-1130

The Core  Series  ("we" or the  "Series")  is a separate  series of Lord  Abbett
Investment Trust (the "Fund").  The Fund currently consists of five series. Only
the Core  Series  and its only  class of  shares  -- Class Y shares -- are being
offered by this Prospectus. We seek income and capital appreciation to produce a
high total return. In seeking this investment  objective,  the Series invests in
U.S. Government debt securities, mortgage-backed securities and investment grade
debt  securities.  There can be no assurance that we will achieve our objective.
This Prospectus  sets forth  concisely the information  about the Series and the
Fund that a  prospective  investor  should  know  before  investing.  Additional
information about the Series and the Fund has been filed with the Securities and
Exchange Commission.  The Statement of Additional Information is incorporated by
reference into this Prospectus and may be obtained,  without charge,  by writing
to the Fund or by calling 800-874-3733. Ask for "Part B of the Prospectus -- The
Statement of Additional Information."

The date of this  Prospectus  and of the Statement of Additional  Information is
March , 1998.

PROSPECTUS

Investors should read and retain this Prospectus.  Shareholder  inquiries should
be made in  writing to the Fund or by  calling  800-821-5129.  You can also make
inquiries through your broker-dealer.

Shares of the  Series are not  deposits  or  obligations  of, or  guaranteed  or
endorsed by, any bank,  and the shares are not federally  insured by the Federal
Deposit Insurance  Corporation,  the Federal Reserve Board, or any other agency.
An  investment  in the Series  involves  risks,  including  the possible loss of
principal.

        1       Investment Objective    2

        2       Fee Table               2

        3       How We Invest           2

        4       Purchases               6

        5       Our Management          7

        6       Dividends, Capital Gains
                Distributions and Taxes 8

        7       Redemptions             8
        8       Performance             9

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>


1 INVESTMENT OBJECTIVE

Our investment objective is to seek income and capital appreciation to produce a
high total return. In pursuit of this objective,  the Series over time will have
volatility  approximating  that of an average duration falling within a range of
2.5 and 6.5 years  currently.  Using the average duration of the Lehman Brothers
Aggregate Bond Index  (currently 4.5 years) as the center,  the average duration
range is  established  periodically  by extending two years above and below this
center.  We  will  not  change  our  investment  objective  without  shareholder
approval.

2 FEE TABLE

A summary of expenses of the Series is set forth in the table below. The example
should not be considered a  representation  of past or future  expenses.  Actual
expenses may be greater or less than those shown.

SHAREHOLDER TRANSACTION EXPENSES                            CLASS Y 
(AS A PERCENTAGE OF OFFERING PRICE)                         SHARES 
Maximum Sales Load(1) on Purchases 
(See  "Purchases")                                          None 
Deferred Sales Charge (See "Purchases")                     None 
ANNUAL FUND OPERATING EXPENSES 
(AS A PERCENTAGE OF AVERAGE  NET  ASSETS)  
Management  Fees(2)  (See "Our  Management")                0.50% 
Other Expenses(2) (See "Our Management                      0.30%

Total Operating Expenses(2)                                 0.80%


EXAMPLE:  Assume an  annual  return of 5% and there is no change in the level of
expenses  described above.  For a $1,000  investment,  with  reinvestment of all
dividends  and  distributions,  you  would  pay the  following  total  expenses,
assuming  redemption  on the last day of each period  indicated.

                    1 year  3 years

Class Y Shares(3)     $8      $26

(1)Sales "load" is referred to as sales "charge" throughout this Prospectus.

(2)Although  not obligated to, Lord,  Abbett & Co .may waive its  management fee
and subsidize the expenses of the Series.

(3)These figures do not reflect a management fee waiver and expense subsidy from
Lord, Abbett & Co.

The  foregoing  is provided  to give  investors  a better  understanding  of the
expenses that are incurred by an investment in the Series.

3 HOW WE INVEST

The  management  of the Fund will  allocate  the Series'  investments  among the
following three sectors of the fixed-income securities markets:

- - U.S.  GOVERNMENT  DEBT  SECURITIES  SECTOR  --  consisting  primarily  of debt
obligations of the U.S. government, its agencies and instrumentalities ,

- - MORTGAGE-BACKED SECURITIES SECTOR-- consisting of securities that directly or
indirectly represent a  participation  in, or are secured by and payable from,
mortgage loans secured by real property, and

- -  INVESTMENT  GRADE DEBT  SECURITIES  SECTOR --  consisting  primarily  of debt
securities which, at the time of purchase,  are "investment  grade," i.e., rated
within one of the four highest  grades  determined  either by Moody's  Investors
Service,  Inc.  or  Standard & Poor's  Ratings  Services  or the  equivalent  in
management's opinion.

     Lord,Abbett & Co. ("Lord Abbett") will  continuously  review the allocation
of  assets  among  these  three  sectors  and  make   adjustments  as  it  deems
appropriate.  There is no fixed limit on  allocations  among the  sectors.  U.S.
Government Debt Securities.  

     U.S.  Government  securities  include:  (1) obligations  issued by the U.S.
Treasury,  differing  only in  their  interest  rates,  maturities  and  time of
issuance and (2) obligations  issued or guaranteed by U.S.  Government  agencies
and instrumentalities which are supported by any of the following:  (a) the full
faith and credit of the United  States  (such as  Government  National  Mortgage
Association ("GNMA")  certificates),  (b) the right of the issuer to borrow from
the  U.S.  Treasury  or (c) the  credit  of the  instrumentality.  Agencies  and
instrumentalities include the Federal Home Loan Bank, Federal Home Loan Mortgage
Corporation ("FHLMC"),  Federal National Mortgage Association ("FNMA"),  Federal
Farm  Credit  Bank,  Student  Loan  Marketing   Association,   Tennessee  Valley
Authority, Financing Corporation and Resolution Funding Corporation. Obligations
issued   by  the   U.S.   Treasury   and  by  U.S.   Government   agencies   and
instrumentalities  include  those  so  issued  in a form  separated  into  their
component parts of principal and coupon payments,  i.e., "component securities."
A security backed by the U.S.  Treasury or a U.S.  Government  agency,  although
providing  substantial  protection against credit risk, is guaranteed only as to
the timely payment of interest and principal  when held to maturity.  The market
prices  for  such   securities  are  not  guaranteed  and  will  fluctuate  and,
accordingly,  such securities will not protect  investors  against price changes
due to changing interest rates. Longer maturity U.S.  Government  securities may
<PAGE>

exhibit  greater price  volatility in response to changes in interest rates than
shorter maturity securities. In addition, certain U.S. Government securities may
show even greater volatility if, for example, the interest payment component has
been removed, as with zero coupon bonds.

 MORTGAGE-BACKED  SECURITIES.  Mortgage-backed  securities are  securities  that
directly  or  indirectly  represent  a  participation  in, or are secured by and
payable from, mortgage loans secured by real property. There are currently three
basic types of mortgage-backed securities: (a) those issued or guaranteed by the
U.S. Government or one of its agencies or instrumentalities,  such as GNMA, FNMA
and FHLMC;  (b) those issued by private issuers that represent an interest in or
are  collateralized  by  mortgage-backed  securities issued or guaranteed by the
U.S.  Government  or one of its  agencies  or  instrumentalities;  and (c) those
issued by private issuers that represent an interest in or are collateralized by
whole  mortgage  loans  or  mortgage-backed   securities  without  a  government
guarantee  but  usually  having  some form of private  credit  enhancement.  The
dominant  issuers or guarantors of  mortgage-backed  securities  today are GNMA,
FNMA and FHLMC.  GNMA  creates  mortgage  securities  from  pools of  government
guaranteed or insured  (Federal  Housing  Authority or Veterans  Administration)
mortgages originated by mortgage bankers, commercial banks, and savings and loan
associations.  FNMA and FHLMC  issue  mortgage-backed  securities  from pools of
conventional  and federally  insured  and/or  guaranteed  residential  mortgages
obtained from various entities, including savings and loan associations, savings
banks,  commercial banks,  credit unions and mortgage  bankers.  Mortgage-backed
securities  issued  by GNMA,  FNMA and  FHLMC  are  considered  U.S.  Government
securities.  The Series will not invest in mortgage-backed  securities issued by
private issuers unless they are rated, or the equivalent of, investment grade.

     Certain mortgage-backed securities "pass-through" to investors the interest
and  principal  payments  generated by a pool of mortgages  assembled  for sale.
Pass-through  mortgage-backed  securities  entail the risk that principal may be
repaid at any time because of prepayments on the underlying mortgages.  That may
result in  greater  price and yield  volatility  than  traditional  fixed-income
securities that have a fixed maturity and interest rate.

     The Series may invest in collateralized  mortgage obligations ("CMOs") that
are  "stripped";  that is, the security is divided into two parts,  one of which
receives some or all of the principal  payments and the other of which  receives
some or all of the  interest.  Stripped  securities  that receive  interest only
("IOs")  are  subject to  increased  volatility  in price due to  interest  rate
changes and have the additional risk that if the principal underlying the CMO is
prepaid (which is more likely to happen if interest rates fall), the Series will
lose the  anticipated  cash flow from the  interest on the  mortgages  that were
prepaid.  Stripped  securities that receive principal  payments only ("POs") are
also subject to increased  volatility  in price due to interest rate changes and
have the additional  risk that the security will be less liquid during demand or
supply imbalances. IOs and POs issued by the U.S. Government or its agencies and
instrumentalities  that are backed by fixed-rate mortgages are considered liquid
securities by management of the Series. All other IOs and POs will be considered
illiquid.

     INVESTMENT GRADE DEBT SECURITIES.  We may invest in debt securities  which,
at the time of purchase,  are rated  investment  grade or are the  equivalent in
management's  opinion.  These investment grade debt securities include corporate
bonds  and  debentures,   mortgage-backed  securities,   corporate  asset-backed
securities and Yankees.  Some of these are zero coupon securities and securities
issued on a when-issued or delayed-delivery basis.

     OTHER POLICIES

   WHEN-ISSUED  SECURITIES.  We may purchase  securities on a when-issued  basis
and, while awaiting delivery and before paying for them ("settlement"), normally
may invest in short-term  U.S.  Government and investment  grade debt securities
without  amortizing  any  premiums.  We do not start  earning  interest on these
when-issued  securities  until  settlement  and often  will  sell them  prior to
settlement.  This investment strategy is expected to contribute significantly to
a portfolio turnover rate  substantially in excess of 100% for the Series.  This
strategy will have little or no transaction cost or adverse tax consequences for
the Series.  Transaction  costs  normally  will  exclude  brokerage  because our
<PAGE>

fixed-income  portfolio transactions are usually on a principal basis when using
this strategy, and any mark-ups charged normally will be more than offset by the
beneficial economic consequences anticipated at the time of purchase. During the
period  between  purchase  and  settlement,  the  value of the  securities  will
fluctuate and assets consisting of cash and/or  marketable  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.

LENDING  SECURITIES.  We may engage in the lending of our portfolio  securities.
These loans may not exceed 30% of the value of the Series' total assets. In such
an  arrangement,  the Series loans  securities  from its portfolio to registered
broker-dealers. Such loans are continuously collateralized by an amount at least
equal to 100% of the market value of the securities  loaned.  Cash collateral is
invested in  obligations  issued or  guaranteed  by the U.S.  Government  or its
agencies, commercial paper or bond obligations rated AA or A-1/P-1 by Standard &
Poor's Rating Services ("S&P") or Moody's Investors Services,  Inc. ("Moody's"),
respectively,  or repurchase  agreements with respect to the foregoing.  As with
other extensions of credit, there are risks of delay in recovery and market loss
should the borrowers of the portfolio securities fail financially.

REPURCHASE AGREEMENTS. We may enter into repurchase agreements with respect to a
security. A repurchase agreement is a transaction by which the Series acquires a
security  and  simultaneously  commits to resell that  security to the seller (a
bank or securities  dealer) at an agreed upon price on an agreed upon date. Such
repurchase  agreement  must,  at all times,  be  collateralized  by cash or U.S.
Government  securities having a value equal to or in excess of, the value of the
repurchase agreement.

CONVERSION  RIGHTS AND WARRANTS.  We may hold or sell any property or securities
which we may obtain through the exercise of conversion  rights or warrants or as
a result of any reorganization,  recapitalization or liquidation proceedings for
any issuer of securities  owned by us. In no event will we voluntarily  purchase
any securities other than debt  securities,  if, at the time of such purchase or
acquisition,  the  value  of  the  property  and  securities,  other  than  debt
securities,  in our  portfolio  is  greater  than 35% of the  value of our gross
assets. A purchase or acquisition will not be considered  "voluntary" if made in
order to avoid loss in value of a conversion or other premium.

ILLIQUID  SECURITIES.  We may  invest up to 15% of our net  assets  in  illiquid
securities. Securities which are subject to legal or contractual restrictions on
resale,  but which have been  determined  by the Board of Trustees to be liquid,
such as Rule 144A securities,  will not be subject to this limit.  Investment by
the Series in such securities, initially determined to be liquid, could have the
effect of  diminishing  the level of the  Series'  liquidity  during  periods of
decreased market interest in such securities.

BORROWING.  We may not borrow in excess of 33 1/3% of our 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.

YANKEES.  The Series may invest in the securities of foreign  issuers payable in
U.S. dollars issued inside the U.S. ("Yankees") which are included in the Lehman
Brothers Aggregate Bond Index.

CORPORATE  ASSET-BACKED  SECURITIES.   Asset-backed  securities  are  fractional
interests  in pools of consumer  loans and other trade  receivables,  similar to
mortgage-backed  securities.  They are  issued by  trusts  and  special  purpose
corporations.  They are backed by a pool of assets,  such as credit card or auto
loan  receivables,  which are the obligations of a number of different  parties.
The income from the underlying  pool is passed  through to holders,  such as the
Series. These securities are frequently supported by a credit enhancement,  such
as a letter of credit, a guarantee or a preference right. However, the extent of
the credit  enhancement may be different for different  securities and generally
applies to only a fraction of the security's  value.  These  securities  present
special risks. For example,  in the case of credit card receivables,  the issuer
of the security may have no security interest in the related  collateral.  Thus,
the risks of corporate  asset-backed  securities are  ultimately  dependent upon
payment of consumer loans by the individual borrowers.
<PAGE>

SHORT  SALES.  The Series may  attempt to limit  exposure  to a possible  market
decline in the value of portfolio  securities  through short sales of securities
which the management  believes  possess  volatility  characteristics  similar to
those being  hedged.  To effect such a  transaction,  the Series will borrow the
security sold short to make delivery to the buyer.  The Series then is obligated
to replace the  security  borrowed by  purchasing  it at the market price at the
time of replacement.  Until the security is replaced,  the Series is required to
pay to the lender any accrued interest or dividends and may be required to pay a
premium.  The  Series  will  realize a gain if the  security  declines  in price
between the date of the short sale and the date on which the Series replaces the
borrowed  security.  On the other hand, the Series will incur a loss as a result
of the short sale if the price of the security  increases  between  those dates.
The amount of any gain will be decreased,  and the amount of any loss increased,
by the amount of any premium or interest or dividends the Series may be required
to pay in connection  with a short sale. The successful use of short selling may
be adversely affected by imperfect correlation between movements in the price of
the security sold short and the securities being hedged.
  The  Series  does not  intend to enter  into  short  sales  (other  than those
"against the box") if immediately  after such sale the aggregate of the value of
all collateral  plus the amount in such  segregated  account  exceeds 10% of the
value of the Series' net assets. A short sale is "against-the-box" to the extent
that the  Series  contemporaneously  owns or has the right to obtain at no added
cost securities identical to those sold short.

HEDGING  TRANSACTIONS.  To help protect the value of the Series'  portfolio from
interest  rate  fluctuations,  the Series may engage in interest  rate swaps and
purchase  interest rate "caps,"  "floors" and  "collars."  The Series will enter
into these transactions primarily to preserve a return or spread on a particular
investment  or portions of its  portfolio or to protect  against any increase in
the price of securities the Series anticipates purchasing. The Series intends to
use these transactions as a hedge and not as a speculative investment.  There is
no assurance that these  transactions  will be  successful.  The Series will not
sell  interest  rate caps or floors  where it does not own  securities  or other
instruments  providing  the income  stream the Series may be  obligated  to pay.

Interest  rate swaps are the exchange by the Series with another  party of their
respective  commitments  to pay or receive  interest  with respect to a notional
(agreed  upon)  principal  amount,  for  example,  an exchange of floating  rate
payments for fixed rate payments. Interest rate swaps are generally entered into
to permit the party seeking a floating or fixed rate obligation, as the case may
be, the  opportunity to acquire such obligation at a lower rate than is directly
available in the credit  market.  The success of such a  transaction  depends in
large part on the  availability of fixed rate obligations at a low enough coupon
rate to cover the cost involved.

The purchase of an interest rate cap entitles the purchasers, to the extent that
a specified index exceeds a predetermined  interest rate, to receive payments of
interest on a notional principal amount from the party selling the interest rate
cap.  The purchase of an interest  rate floor  entitles  the  purchaser,  to the
extent that a specified  index falls below a  predetermined  interest  rate,  to
receive  payments  of  interest  on a notional  principal  amount from the party
selling such interest rate floor. A collar is a combination of a cap and a floor
that preserves a certain return within a  predetermined  range of interest rates
or values.

EURODOLLAR   INSTRUMENTS.   The  Series  may  make   investments  in  Eurodollar
instruments.   Eurodollar  instruments  are  U.S.   dollar-denominated   futures
contracts or options  thereon which are linked to the London  Interbank  Offered
Rate ("LIBOR"). Eurodollar futures contracts enable purchasers to obtain a fixed
rate for the lending of funds and sellers to obtain a fixed rate for borrowings.
The Series might use Eurodollar  futures  contracts and options thereon to hedge
against  changes in LIBOR,  to which many  interest  rate swaps and fixed income
instsruments are linked.

Investments in Eurodollar  instruments  which are traded on domestic and foreign
securities exchanges may entail risks to the extent traded on foreign securities
exchanges,  including less regulation;  foreign,  political,  legal and economic
factors;  less availability of information;  different  settlement practices and
currency fluctuations.
<PAGE>

OPTIONS AND FUTURES. The Series may deal in options on securities and options on
securities  indices,  and futures  transactions with respect to such securities,
and options on such  futures and short  sales with  respect to such  options and
futures.  The Series may write  (sell) call options and put options on up to 25%
of its net assets and may purchase put and call  options  provided  that no more
than 5% of its net assets (at the time of purchase)  may be invested in premiums
on such options.

RISKS OF OPTIONS,  FUTURES AND INCOME ENHANCEMENT  STRATEGIES.  Participation in
the options or futures markets involves  investment risks and transaction  costs
to which the  Series  would not be subject  absent the use of these  strategies.
Risks  inherent in the use of options and futures  include:  (1)  dependence  on
management's ability to predict correctly movements in the direction of specific
securities  being hedged or the movement in  securities  indices;  (2) imperfect
correlation  between  the price of options  and  securities  index  futures  and
options thereon and movements in the prices of the securities being hedged;  (3)
the fact that skills needed to use these  strategies  are  different  from those
needed to select  portfolio  securities;  (4) the  possible  absence of a liquid
secondary  market for any  particular  instrument at any time;  (5) the possible
need to  defer  closing  out  certain  hedged  positions  to avoid  adverse  tax
consequences;  and (6) daily limits on price variance for a futures  contract or
related  options  imposed by certain  futures  exchanges and boards of trade may
restrict transactions in such securities on a particular day.

USE OF SEGREGATED AND OTHER SPECIAL ACCOUNTS.  Many Series  investments (such as
short  sales  other than those  "against  the box,"  options  and  futures),  in
addition to other requirements, require that the Series segregate cash or liquid
assets with its  custodian to the extent  Series  obligations  are not otherwise
"covered" through ownership of the underlying security,  financial instrument or
currency. In general,  either the full amount of any obligation by the Series to
pay or  deliver  securities  or  assets  must be  covered  at all  times  by the
securities, instruments or currency required to be delivered, or, subject to any
regulatory  restrictions,  an amount of cash or liquid securities at least equal
to the current amount of the obligation  must be segregated  with the custodian.
The segregated assets cannot be sold or transferred unless equivalent assets are
substituted in their place or it is no longer necessary to segregate them.

In the case of a futures contract or an option thereon,  the Series must deposit
initial  margin and possible daily  variation  margin in addition to segregating
assets  sufficient to meet its  obligation to purchase or provide  securities or
currencies,  or to pay the amount owed at the expiration of a futures  contract.

In the case of short sales, the Series must provide collateral to the lender and
(except for short  sales  "against  the box") also  maintain  additional  assets
consisting  of cash or liquid  assets in a  segregated  account with the Series'
custodian..

DURATION MANAGEMENT. Although the U.S. Government securities, zero coupon bonds,
GNMA certificates,  mortgage-backed securities, asset-backed securities, futures
and  options  mentioned  herein  may be  volatile,  this  volatility,  while not
eliminated,  is managed by the policy of Lord  Abbett to  maintain  the  average
duration of  securities  held by the Series  within the average  duration  range
mentioned above under "Investment Objective."

4 PURCHASES

CLASS Y SHARES.  Class Y shares are  purchased  at net asset value with no sales
charge  of any kind.  The net asset  value of our  shares  is  calculated  every
business day as of the close of the New York Stock Exchange ("NYSE") by dividing
net assets by the number of shares  outstanding.  Securities are valued at their
market value as more fully described in the Statement of Additional Information.

WHO MAY INVEST? Eligible purchasers of Class Y shares include (i) 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 any  account(s) in excess of $10 million  managed by Lord Abbett or
its  sub-advisors  on  a  private-advisory-account   basis;  (ii)  institutional
<PAGE>

investors,   including  retirement  plans,   companies,   foundations,   trusts,
endowments  and other  entities  where the total amount of potential  investable
assets  exceeds $50 million that were not  introduced  to Lord Abbett by persons
associated  with a broker or dealer  primarily  involved in the retail  security
business; and (iii) employees and partners of Lord Abbett,  directors (trustees)
of  Lord-Abbett-managed  funds and  spouses  and other  family  members  of such
employees, partners and directors (trustees). All shares may be purchased at the
net asset  value per share next  computed  after the order is  received  by Lord
Abbett.  The minimum initial  investment with respect to investors  mentioned in
(iii)  above  is  $1,000.  Subsequent  investments  may be made  in any  amount.
Certificates  representing  shares  of the Fund  will not be  issued.  This will
relieve  shareholders of the  responsibility  and  inconvenience  of safekeeping
share certificates and save the Fund unnecessary expense.

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 or through Lord Abbett  Distributor.  Place your order
with  your  investment  dealer  or send it to the  Core  Series  of Lord  Abbett
Investment Trust (P.O. Box 419100,  Kansas City,  Missouri  64141).  The minimum
initial  investment is $1 million except for those investors  mentioned in (iii)
above.  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 the 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 net asset value 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 net asset
value  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 1-800  821-5129 to set up your
account and to arrange a wire  transaction.  Wire to:  United  Missouri  Bank of
Kansas   City,    N.A.,    Routing    number   -    ----------------,    Account
Number:------------,  FBO: (account name) and (account number.) Specify the Core
Series of Lord Abbett Investment Trust, 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 -  ------------,  account
number:-------------, FBO: (account name) and (account number). Specify the Core
Series of Lord Abbett  Investment  Trust,  note Class Y shares and include  your
account number and your name.

TELEPHONE EXCHANGE PRIVILEGE.  Class Y shares may be exchanged without a service
charge for shares of the same class of any other Lord Abbett-sponsored fund.

5 OUR MANAGEMENT

Our business is managed by our officers on a day-to-day  basis under the overall
direction  of our  Board of  Trustees  with the  advice of Lord  Abbett  (herein
referred to as  "management").  We employ Lord Abbett as investment  manager for
the  Series  pursuant  to a  Management  Agreement.  Lord  Abbett  has  been  an
investment  manager for over 67 years and currently  manages  approximately  $25
billion  in a family of mutual  funds and  other  advisory  accounts.  Under the
Management  Agreement,  Lord  Abbett is  obligated  to provide  the Series  with
investment  management  services  and  executive  and other  personnel,  pay the
remuneration  of our officers and of our trustees  affiliated  with Lord Abbett,
provide us with  office  space and pay for  ordinary  and  necessary  office and
clerical expenses relating to research,  statistical work and supervision of the
Series' portfolio and certain other costs. Lord Abbett provides similar services
to twelve other Lord Abbett-sponsored funds having various investment objectives
<PAGE>

and also advises other investment clients.  

The  Fund's  investment  decisions  are made by  Robert  Gerber.  Mr.  Gerber is
Executive  Vice  President and Portfolio  Manager of the Fund, and has served in
this capacity since the date of this  Prospectus.  He joined Lord Abbett in July
1997 as Director of High Grade Fixed Income.  Prior to joining Lord Abbett,  Mr.
Gerber  served as a Senior  Portfolio  Manager  and  Shareholder  of  Sanford C.
Bernstein & Co., Inc. for five years.

Under the  Management  Agreement,  the Series is  obligated to pay Lord Abbett a
monthly fee based on its  average  daily net assets for each month at the annual
rate of .50%. Although Lord Abbett is not obligated to, it may waive part or all
of the payment of the  management  fee and subsidize  the Series'  expenses from
time to time after  commencement of operations of the Series.  The effective fee
payable to Lord Abbett by the Series as a percentage of average daily net assets
is  expected  to be at the annual  rate of .50% for the year  subsequent  to the
Series'  commencement  of  operations.  In  addition,  we pay all  expenses  not
expressly  assumed by Lord  Abbett.  The Series'  ratio of  expenses,  including
management  fee  expenses,  to average  net assets for such  one-year  period is
expected to be .80%.


6 DIVIDENDS, CAPITAL GAINS DISTRIBUTIONS AND TAXES

With respect to the Series,  dividends from taxable net investment income may be
taken in cash or invested  in  additional  shares at net asset value  (without a
sales charge) and will be paid to shareholders annually in December.

A capital gains  distribution is made when the Series has net profits during the
year from sales of  securities.  Any capital  gains  distributions  will be made
annually  in  December.  They may be taken in cash or invested in more shares at
net asset value without a sales charge.  

Dividends  and  distributions  declared in October,  November or December of any
year will be treated for federal  income tax purposes as having been received by
shareholders  of the Series in that year if they are paid  before  February 1 of
the following year.

The Series  intends to meet the  requirements  of  Subchapter  M of the Internal
Revenue Code. The Series will try to distribute to  shareholders  all of its net
investment  income and net realized  capital gains, so as to avoid the necessity
of paying federal income tax.  Shareholders,  however, must report dividends and
capital  gains  distributions  as taxable  income.  Dividends  derived  from the
Series'  ordinary  income  and net  short-term  capital  gains  are  taxable  to
Shareholders  at ordinary  income  rates.  Distributions  by the Fund of any net
long-term  capital gains will be taxable to a shareholder  as long-term  capital
gains regardless of how long the shareholder has held the shares. Under recently
enacted legislation,  the maximum tax rate on long-term capital gains for a U.S.
individual, estate or trust is reduced to 20% for distributions derived from the
sale of assets held by the Fund for more than 18 months.  (If the taxpayer is in
the 15% tax bracket,  the rate is 10%.) For distributions  derived from the sale
of assets held by the Fund  between 12 and 18 months the tax rate remains at 28%
(15% if the taxpayer is in the 15% tax bracket).  

Shareholders may be subject to a $50 penalty under the Internal Revenue Code and
we may be required to withhold and remit to the U.S. Treasury a portion (31%) of
any redemption or repurchase proceeds and of any dividend or distribution on any
account,  where the payee  (shareholder)  failed to  provide a correct  taxpayer
identification number or to make certain required certifications.

Limitations  imposed  by the  Internal  Revenue  Code  on  regulated  investment
companies may restrict the Series' ability to engage in transactions in options,
forward contracts and cross hedges.

We will  inform  shareholders  of the federal  tax status of each  dividend  and
distribution after the end of each calendar year.

Shareholders should consult their tax advisers  concerning  applicable state and
local  taxes as well as on the tax  consequences  of gains  or  losses  from the
redemption or exchange of our shares.
<PAGE>

7 REDEMPTIONS

To obtain the proceeds of an  expedited  redemption  of $50,000 or less,  you or
your  representative  with proper  identification  can telephone the Fund.  This
privilege is automatically  extended to all  shareholders.  The Fund will not be
liable for following  instructions  communicated by telephone that it reasonably
believes  to be genuine  with  respect to the Fund and,  therefore,  will employ
reasonable  procedures  to  confirm  that  instructions  received  are  genuine,
including requesting proper identification,  recording all telephone redemptions
and mailing the proceeds only to the named  shareholder at the address appearing
on the account registration.

If you cannot use the expedited redemption  procedures described above to redeem
shares directly, send your request to Lord Abbett Investment Trust - Core Series
(P.O. Box 419100,  Kansas City,  Missouri 64141) with signature(s) and any legal
capacity of the  signer(s)  guaranteed by an eligible  guarantor.  

Under certain  circumstances  and subject to prior written notice,  our Board of
Trustees may  authorize  redemption of all of the shares in any account in which
there are fewer than 25 shares.


8 PERFORMANCE

YIELD AND TOTAL  RETURN.  Yield and total return data may, from time to time, be
included in advertisements  about the Series.  The Series' "yield" is calculated
by dividing the  annualized  net  investment  income per share on the  portfolio
during a 30-day period by the net asset value on the last day of the period. The
yield data  represents a hypothetical  investment  return on the portfolio,  and
does not  measure an  investment  return  based on  dividends  actually  paid to
shareholders.  To  show  that  return,  a  dividend  distribution  rate  may  be
calculated.  The  dividend  distribution  rate is  calculated  by  dividing  the
dividends of the Series'  shares  derived from net  investment  income  during a
stated  period by the net asset value on the last day of the period.  Yields and
dividend  distribution  rates for  Series'  shares  is shown at net asset  value
without the deduction of any sales charge.  

"Total return" for the one-, five- and ten-year  periods  represents the average
annual compounded rate of return on an investment of $1,000 in the Series at the
net asset value.  When total return is quoted for Series' shares, it is shown at
net asset value without the  deduction of any sales charge.  Quotations of yield
or total return for any period when an expense  limitation  is in effect will be
greater than if the limitation had not been in effect. See "Past Performance" in
the Statement of Additional Information for a more detailed description.

See "Performance" in the Statement of Additional Information for a more detailed
discussion concerning the computation of the Series' total return and yield.

This  Prospectus  does not constitute an offering in any  jurisdiction  in which
such offer is not  authorized  or in which the person  making  such offer is not
qualified to do so or to anyone to whom it is unlawful to make such offer.

No person is authorized to give information or to make any  representations  not
contained in this  Prospectus or in  supplemental  literature  authorized by the
Fund, and no person is entitled to rely upon any  information or  representation
not contained herein or therein.
<PAGE>

INVESTMENT MANAGER AND UNDERWRITER
Lord, Abbett & Co. and Lord Abbett Distributor LLC
The General Motors Building
767 Fifth Avenue
New York, New York 10153-0203
212-848-1800

CUSTODIAN
The Bank of New York
48 Wall Street
New York, New York 10286

TRANSFER AGENT AND DIVIDEND
DISBURSING AGENT
United Missouri Bank of Kansas City, N.A.
Tenth and Grand
Kansas City, Missouri 64141

SHAREHOLDER SERVICING AGENT
DST Systems, Inc.
P.O. Box 419100
Kansas City, Missouri 64141 800-821-5129  

AUDITORS 
Deloitte & Touche LLP 

COUNSEL
Debevoise & Plimpton 

Printed in the U.S.A.
LAIT-1-597
(5/97)

LORD ABBETT
INVESTMENT TRUST
THE GENERAL MOTORS BUILDING
767 FIFTH AVENUE
NEW YORK, NY 10153-0203


LORD ABBETT
PROSPECTUS '97
MARCH   , 1998

          Application Inside

LORD ABBETT
INVESTMENT TRUST
CORE SERIES




LORD, ABBETT & CO.
INVESTMENT MANAGEMENT
A TRADITION OF PERFORMANCE THROUGH DISCIPLINED INVESTING
<PAGE>
LORD ABBETT

STATEMENT OF ADDITIONAL INFORMATION                           MARCH __, 1998

                          LORD ABBETT INVESTMENT TRUST
                                   CORE 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 March __, 1998.

Lord Abbett  Investment  Trust  (referred  to as the "Fund") was  organized as a
Delaware  business trust on August 16, 1993. The Fund's  trustees have authority
to create separate classes and series of shares of beneficial interest,  without
further  action by  shareholders.  The Fund has five  series -- U.S.  Government
Securities Series, Limited Duration U.S. Government Securities Series,  Balanced
Series, Strategic Core Series and a new series - Core Series. Only shares of the
Core Series (sometimes  referred to as "we" or the "Series") are offered in this
Statement of Additional  Information and those shares consist of Class Y shares.
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 series may be added in the
future. The Investment Company Act of 1940, as amended (the "Act") requires that
where  more than one  class or  series  exists,  each  class or  series  must be
preferred  over all other  classes or series in  respect of assets  specifically
allocated to such class or series.

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 Fund
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 series affected
by such  matter.  Rule 18f-2  further  provides  that a class or series shall be
deemed to be affected by a matter  unless the  interests of each class or series
in the  matter are  substantially  identical  or the matter  does not affect any
interest of such class or series.  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 Fund or by
calling 800-821-5129. In addition, you can make inquiries through your dealer.

TABLE OF CONTENTS                                                      Page

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.       Performance                                                      12
7.       Taxes                                                            12
8.       Information About the Fund                                       13
9.       Financial Statements                                             14


<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.  The Series may not:
(1) borrow  money,  except that (i) the Series 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) the Series may borrow up to an additional 5% of its total assets
for temporary  purposes,  (iii) the Series may obtain such short-term  credit as
may be  necessary  for  the  clearance  of  purchases  and  sales  of  portfolio
securities  and (iv) the Series 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 Series'  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  the  Series  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 the
Series 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
the Series 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.

With respect to the restrictions mentioned herein, compliance therewith will not
be affected by changes in the market value of portfolio  securities  but will be
determined at the time of purchase or sale of such 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.  The Series 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) 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 series 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 Series' total assets (included within such limitation,  but not to exceed
2% of the Series'  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
<PAGE>

estate limited  partnership  interests or interests in oil, gas or other mineral
leases, or exploration or other development programs, except that the Series 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 Series' 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 series.

LENDING PORTFOLIO SECURITIES

The Series may lend portfolio  securities to registered  brokers-dealers.  These
loans,  if and when made,  may not exceed 30% of the Series' total  assets.  The
Series'  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, the Series 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
Fund.

By  lending  portfolio  securities,  the  Series  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.  The Series will  comply  with the  following
conditions  whenever it loans  securities:  (i) the Series 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 Series must be able to terminate the loan at
any time; (iv) the Series must receive  reasonable  compensation with respect to
the loan,  as well as any  dividends,  interest  or other  distributions  on the
loaned  securities;  (v) the Series 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

The Series may enter into repurchase  agreements  with respect to a security.  A
repurchase  agreement is a transaction  by which the Series  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 Series have a total value in excess
of the value of the repurchase agreement.) The Series 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  Series 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 Series 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  Series  and are  therefore  subject to sale by the
trustee in bankruptcy. Even though the repurchase agreements may have maturities
<PAGE>

of  seven  days or  less,  they may lack  liquidity,  especially  if the  issuer
encounters  financial  difficulties.  While Fund management  acknowledges  these
risks, it is expected that they can be controlled  through  stringent  selection
criteria and careful  monitoring  procedures.  Fund management  intends to limit
repurchase  agreements for the Series to transactions with dealers and financial
institutions  believed by Fund management to present minimal credit risks.  Fund
management will monitor  creditworthiness of the repurchase agreement sellers on
an ongoing basis.  The Series 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 Series otherwise may invest.

WHEN-ISSUED TRANSACTIONS

As stated in the Prospectus,  the Series may purchase portfolio  securities on a
when-issued basis.  When-issued  transactions involve a commitment by the Series
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 the Series 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. The Series, 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.

SHORT SALES

With  respect  to 10% of the net  assets of the  Series,  it may engage in short
sales. When the Series sells short it shall put in a segregated account with its
custodian bank an amount of cash or permitted securities equal to the difference
between (a) the market  value of the  securities  sold short and (b) any cash or
permitted  securities  required to be deposited as collateral with the broker in
connection  with the short sale  (excluding  the proceeds  from the short sale).
Until the Series  replaces the borrowed  security,  it must  maintain on a daily
basis the  segregated  account at such a level that the amount  deposited  in it
plus the amount  deposited with the broker as collateral  will equal the greater
of (1) the current market value of the  securities  sold short or (2) the market
value of the securities at the time they were sold short.

AVERAGE DURATION

The Series 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.  Using the average  duration of this index  (currently 4.5
years) as the center, the average duration range is established  periodically by
extending 2 years above and below this center.  However,  many of the securities
in which the  Series  invests  will have  remaining  durations  in excess of 6.5
years.

Some of the securities in the Series'  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
<PAGE>

period of one year or less, the Series 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 Series' 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

The Series  portfolio  turnover rate for its first year of operation is expected
to be between  100% and 150%.  As  discussed  above,  the  Series  may  purchase
securities  on a  when-issued  basis  with  settlement  taking  place  after the
purchase date (without amortizing any premiums). If this investment technique is
used,  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 the
Series' 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 trustees are partners of Lord Abbett, The General Motors Building,
767 Fifth Avenue, New York, New York 10153-0203.  They have been associated with
Lord Abbett for over five years and are also an  officers  and/or  directors  or
trustees of the twelve other Lord  Abbett-sponsored  funds. They are "interested
persons"  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 53, Chairman and President
E. Wayne Nordberg, age 59, Vice President

The  following  outside  trustees  are also  directors or trustees of the twelve
other Lord Abbett-sponsored funds referred to above.

E. Thayer Bigelow
Courtroom Television Network
600 Third Avenue
New York, New York

Chief Executive Officer of Courtroom Television Network.  Formerly President and
Chief Executive  Officer of Time Warner Cable  Programming,  Inc. Prior to that,
President and Chief Operating Officer of Home Box Office, Inc. Age 56.

<PAGE>

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 67.

John C. Jansing
162 S. Beach Road
Hobe Sound, Florida

Retired. Former Chairman of Independent Election Corporation of America, a proxy
tabulating firm. Age 72.

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,
formerly  Chairman  and  Chief  Executive  Officer  of  Lincoln  Snacks,   Inc.,
manufacturer of branded snack foods (1992-1994). Currently serves as Director of
Den West Restaurant Co., J. B. Williams, and Fountainhead Water Company. Age 64.

Hansel B. Millican, Jr.
Rochester Button Company
1100 Noblin Avenue
South Boston, Virginia

President and Chief Executive Officer of Rochester Button Company.  Age 69.

Thomas J. Neff
Spencer Stuart U.S.
277 Park Avenue
New York, New York

Chairman of Spencer Stuart U.S., an executive search consulting firm. Age 60.

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  directors/trustees.  No
trustee  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.

<PAGE>
<TABLE>
<CAPTION>

                   FOR THE FISCAL YEAR ENDED NOVEMBER 30, 1997
<S>                                 <C>                       <C>                       <C>
(1)                                 (2)                       (3)                       (4)

                                                                                        For Year Ended
                                                              Equity-Based              December 31, 1997
                                                              Benefits Accrued          Total Compensation
                                    Aggregate                 by each Fund and          Accrued by each Fund and
                                    Compensation              Twelve Other Lord         Twelve Other Lord
                                    Accrued by                Abbett-sponsored          Abbett-sponsored
NAME OF DIRECTOR                    THE FUND1                 FUNDS2                    FUNDS3


E. Thayer Bigelow                   $10,580                   $16,641                   $56,000
Stewart S. Dixon                    $10,388                   $32,015                   $55,000
John C. Jansing                     $10,388                   $46,430                   $55,000
C. Alan MacDonald                   $10,843                   $29,994                   $57,400
Hansel B. Millican, Jr.             $10,438                   $38,069                   $55,000
Thomas J. Neff                      $10,528                   $18,804                   $56,000

<FN>

     1.   Outside  trustees  fees,  including  attendance  fees  for  board  and
          committee  meetings,  are  allocated  among all Lord  Abbett-sponsored
          funds based on net assets of each fund.  A portion of the fees payable
          by the Fund to its  outside  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 trustees.  The amounts of the aggregate
          compensation  payable  by the Fund as of  November  30,  1997,  deemed
          invested in Fund shares, including dividends reinvested and changes in
          net asset value  applicable  to such  deemed  investments,  were:  Mr.
          Bigelow,  $39,081; Mr. Dixon,  $107,152;  Mr. Jansing,  $142,903;  Mr.
          MacDonald,  $84,555; Mr. Millican, $143,927 and Mr. Neff, $143,008. If
          the  amounts  deemed  invested  in  Fund  shares  were  added  to each
          trustee's actual holdings of Fund shares as of November 30, 1997, each
          would own, the following:  Mr.  Bigelow,  _______  shares;  Mr. Dixon,
          _______shares;   Mr.   Jansing,   _______   shares;   Mr.   MacDonald,
          ________shares;  Mr.  Millican,  _______  shares;  Mr.  Neff,  _______
          shares.

     2.   Each Lord  Abbett-sponsored  fund has a retirement plan providing that
          outside directors(trustees) may receive annual retirement benefits for
          life  equal  to  100%  of  their  final  annual  retainers   following
          retirement at or after age 72 with at least 10 years of service.  Each
          plan also provides for a reduced benefit upon early  retirement  under
          certain circumstances,  a pre-retirement death benefit and actuarially
          reduced  joint-and-survivor  spousal benefits.  Such retirement plans,
          and the deferred  compensation plans referred to in footnote one, were
          amended   during  1996  to,  among  other   things,   enable   outside
          directors(trustees)  to elect to convert  their  prospective  benefits
          under the retirement plans to equity-based benefits under the deferred
          compensation  plans (renamed the  equity-based  plans and  hereinafter
          referred to as such). Five of the six outside directors(trustees) made
          such an election. Mr. Jansing did not. The amounts accrued in column 3
          were accrued by the Lord Abbett-sponsored  funds for the twelve months
          ended November 30, 1997 with respect to the equity-based  plans. Under
          the 1996 amendments,  the annual retainer was increased to $50,000 and
          the annual  retirement  benefits were  increased from 80% to 100% of a
          trustee's final annual  retainer.  Thus, if Mr. Jansing were to retire
          at or after age 72 and the annual  retainer  payable by the funds were
          the same as it is today, he would receive annual  retirement  benefits
          of $50,000.

3.       This column shows aggregate  compensation,  including trustees 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, 1997.
</FN>
</TABLE>

Except where indicated,  the following  executive officers of the Fund have been
associated  with Lord  Abbett for over five  years.  Of the  following,  Messrs.
Allen, Brown, Carper, Ms. Foster, Messrs. Hilstad,  Morris, Noelke and Walsh are
partners of Lord Abbett;  the others are employees;  Robert Gerber, age 43 (with
<PAGE>

Lord  Abbett  since  1997,  formerly  Senior  Portfolio  Manager  of  Sanford C.
Bernstein & Co.),  Executive Vice President;  Paul A. Hilstad, age 55 (with Lord
Abbett  since 1995 - formerly  Senior  Vice  President  and  General  Counsel of
American  Capital  Management & Research,  Inc.),  Vice President and Secretary;
Stephen I. Allen, age 44; Zane E. Brown, age 46; Daniel E. Carper, age 46; Daria
Foster,  age 43;  Lawrence  H.  Kaplan,  age 41 (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 55;
Robert G. Morris,  age 53, Robert Noelke,  age 41; A. Edward  Oberhaus,  age 38;
Keith F. O'Connor, age 42; John J. Walsh, age 62, Vice Presidents;  and Donna M.
McManus,  age 37,  (with Lord Abbett  since 1996,  formerly a Senior  Manager at
Deloitte & Touche LLP) Treasurer.

The Fund  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
Fund's Declaration of Trust,  shareholder  meetings may be called at any time by
certain  officers  of the  Fund or by a  majority  of the  trustees  (i) for the
purpose of taking action upon any matter  requiring the vote or authority of the
Fund'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 December 26, 1997 Lord,  Abbett & Co. owned all of our shares.  Therefore,
those trustees and officers that are also partners of Lord, Abbett & Co. own, as
a group, 100% of our outstanding shares.


                                       3.
                     INVESTMENT ADVISORY AND OTHER SERVICES

As described under "Our Management" in the Prospectus, Lord Abbett is the Fund's
investment  manager.  Ten of the twelve general partners of Lord Abbett,  all of
whom are officers and/or trustees of the Fund,  are:  Stephen I. Allen,  Zane E.
Brown, Daniel E. Carper, Robert S. Dow, Daria L. Foster, Paul A. Hilstad, Robert
G. Morris,  Robert J.  Noelke,  E. Wayne  Nordberg and John J. Walsh.  The other
general  partners of Lord Abbett who are neither  officers  nor  trustees of the
Fund are W. Thomas Hudson and Michael B. McLaughlin. The address of each partner
is The General Motors Building, 767 Fifth Avenue, New York, New York 10153-0203.

The services  performed by Lord Abbett are described  under "Our  Management" in
the Prospectus.  Under the Management Agreement,  the Series is obligated to pay
Lord Abbett a monthly  fee based on its average  daily net assets for each month
at the annual rate of .50 of 1%.  Although  Lord Abbett is not  obligated to, it
may waive part or all of the payment of the management fee and subsidize part or
all of the Series'  expenses from time to time after  commencement of operations
of the  Series.  The  effective  fee  payable to Lord  Abbett by the Series as a
percentage  of average  daily net assets is expected to be at the annual rate of
 .50% for the year subsequent to the Series' commencement of operations.

The Series  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.

Deloitte & Touche LLP, Two World Financial Center, New York, New York 10281, are
<PAGE>

the  independent  public  accountants  of the Fund and must be approved at least
annually by our  trustees to  continue in such  capacity.  Deloitte & Touche LLP
perform  audit  services for the 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 Fund's custodian.


                                       4.
                             PORTFOLIO TRANSACTIONS

It is expected that  purchases and sales of the Series'  fixed-income  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 Series 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.

The  Series'  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 Fund 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
Fund; 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  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.
<PAGE>

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.

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.


                                       5.
                             PURCHASES, REDEMPTIONS
                            AND SHAREHOLDER SERVICES

Securities in the Series'  portfolio are valued at their market values as of the
close of the 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 Fund'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 foreign  assets of the Series,  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 Fund.  The Board of Trustees  will
monitor, on an ongoing basis, the Fund'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"   and
"Redemptions," respectively.

As  disclosed  in the  Prospectus,  we  calculate  our net  asset  value and are
otherwise  open for  business  on each day  that  the New  York  Stock  Exchange
("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.
<PAGE>

The  offering  price of Class Y shares of the Series  for the  period  indicated
below were computed as follows:

                                                     DECEMBER 26, 1997
                                                     CORE SERIES


Net asset value per share (net assets divided
  by shares outstanding)                             $10.01



EXCHANGES.  The Prospectus briefly describes the Telephone  Exchange  Privilege.
You may exchange  some or all of your Class Y shares for those of the same class
of Lord Abbett-sponsored  funds currently offered to the public. You should read
the  prospectus  of the other fund  before  exchanging.  In  establishing  a new
account by exchange,  shares of the Fund 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  Series'  shares.
Exchanges  are based on relative  net asset values on the day  instructions  are
received by the Fund in Kansas City if the  instructions  are received  prior to
the  close of the NYSE in  proper  form.  No sales  charges  are  imposed  in an
exchange  of  Class Y  shares  of one Lord  Abbett-sponsored  fund for  those of
another.  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 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,  Lord Abbett
Equity Fund ("LAEF") which is not issuing shares,  and any series of Lord Abbett
Research Fund not offered to the general public ("LARF").

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 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
<PAGE>

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.


                                       6.
                                   PERFORMANCE

The Series  computes the average annual  compounded rate of total return for its
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 $1,000,
which  represents a hypothetical  initial  investment.  The calculation  assumes
deduction  of no 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 Y shares, no sales charge with respect to
the Series (as a percentage of the offering  price) is deducted from the initial
investment . 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.

The Series'  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 net asset value per share on the last day of the  period.  This is
determined by finding the  following  quotient:  take the Series'  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  Series  shares
outstanding  during the period that were entitled to receive  dividends and (ii)
the Series'  net asset  value 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 Y shares is shown based on the Fund's net
asset value per share.

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 Series  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 Series
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 the Fund as a "capital gains distribution" which you
received  with respect to such shares.  Losses on the sale of Series  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.

The Series 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
<PAGE>

in accordance with a calendar year distribution requirement.  The Series intends
to  distribute  to  shareholders  each  year an  amount  adequate  to avoid  the
imposition of such excise tax. Dividends paid by the Series will qualify for the
dividends-received  deduction  for  corporations  to the  extent  that  they are
derived from dividends paid by domestic corporations.

As described in the Prospectus  under "Risk  Factors," the Series 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 Series 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 Series.

Gains and losses realized by the Series 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 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
the Series, 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 Series shares.

                                       8.
                           INFORMATION ABOUT THE FUND

SHAREHOLDER  LIABILITY.  Delaware law provides that Fund  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 Fund's  Declaration  of Trust
contains  an  express   disclaimer  of  shareholder   liability  for  the  acts,
obligations, or affairs of the Fund or any series and requires that a disclaimer
be given in each contract  entered into or executed by the Fund. The Declaration
provides for  indemnification  out of the Fund's  property of any shareholder or
former shareholder held personally liable for the obligations of the Fund. 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 Fund received for the issue or sale of the shares of
each Series and all income,  earnings,  profits,  and proceeds thereof,  subject
only to the rights of creditors,  are especially  allocated to each Series,  and
constitute the underlying  assets of such Series.  The underlying assets of each
Series are  recorded on the books of account of the Fund,  and are to be charged
with the liabilities with respect to such Series 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 Fund,  the holders of the shares of each Series are entitled to receive as a
class the underlying assets of such Series available for distribution.

Under the Fund's  Declaration of Trust, the trustees may, upon shareholder vote,
cause  the  Fund to  merge  or  consolidate  into,  or sell  and  convey  all or
substantially  all of,  the  assets  of the  Fund or any  Series  to one or more
<PAGE>
trusts,  partnerships  or  corporations,  so long as the surviving  entity is an
open-end management investment company that will succeed to or assume the Fund's
registration statement. In addition, the trustees may, without shareholder vote,
cause the Fund to be incorporated under Delaware law.

Derivative  actions on behalf of the Fund or any  Series may be brought  only by
shareholders owning not less than 50% of the then outstanding shares of the Fund
or any Series, 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, 1997 and the report
of  Deloitte  & Touche  LLP,  independent  public  accountants,  on such  annual
financial  statements contained in the 1997 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.






<PAGE>

PART C OTHER INFORMATION

Item 24. FINANCIAL STATEMENTS AND EXHIBITS

     (a)  Financial  Statements  Part A -  Financial  Highlights  for the period
          November  4, 1993  (commencement  of  operations  -  Limited  Duration
          Government  Series) to October  31,  1994 and the fiscal  years  ended
          October 31, 1995,  1996 and the six months  ended July 30,  1997;  the
          period  December  27,  1994  (commencement  of  operations  - Balanced
          Series) to October 31, 1995 and the fiscal year ended October 31, 1996
          and the six months ended July 30, 1997.
 
     Part B -  Statement  of Net Assets at October  31,  1996 and the six months
          ended  July 30,  1997.  Statement  of  Operations  for the year  ended
          October 31, 1996 and the six months ended July 30, 1997.

     (b)  Exhibits -

          99.B1     Form of Amendment to Declaration of Trust*
          99.B5     Form of Addendum to Management Agreement between Lord
                    Abbett Investment Trust and Lord Abbett & Co.*
          99.B6     Form of Distribution Agreement**
          99.B11    Consent of Deloitte & Touche.**
          Ex. 27    Financial Data Schedule*


          *         Filed herewith.
          **        To be filed.
          ***       Incorporated by Reference to Post-Effective Amendment No.

          Exhibit items not listed above have either already been filed or are 
          not applicable.


Item 25.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

          None.


Item 26.  NUMBER OF RECORD HOLDERS OF SECURITIES
          (as of December 5, 1997)


U.S. Government Securities    85,278  -(Class A)
                                 472  -(Class B)
                               4,959  -(Class C)


Limited Duration Government      202  -(Class A)
                                 183  -(Class C)


Balanced                         913  -(Class A)
                                 917  -(Class C)

<PAGE>

Item 27. 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  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
<PAGE>

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 28. 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 investment  adviser to  approximately  5,700
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 except as follows:

         John J. Walsh
         Trustee
         Brooklyn Hospital
         Parkside Avenue
         Brooklyn, N.Y.


Item 29. 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 ADVISER

American Skandia Trust (Lord Abbett Growth and Income Portfolio)

     (b)  The partners of Lord,  Abbett & Co. which is the sole managing  member
          of Lord Abbett  Distributor  LLC, the  principal  underwriter  for the
          funds mentioned in (a) above are:
<PAGE>



         Name and Principal         Positions and Offices
         BUSINESS ADDRESS (1)       WITH REGISTRANT      

         Robert S. Dow              Chairman and President
         Paul A. Hilstad            Vice President & Secretary
         Stephen I. Allen           Vice President
         Zane E. Brown              Vice President
         Daniel E. Carper           Vice President
         Daria L. Foster            Vice President
         Robert G. Morris           Vice President
         Robert J. Noelke           Vice President
         E. Wayne Nordberg          Vice President
         John J. Walsh              Vice President

               The other  general  partners of Lord Abbett & Co. who are neither
          officers nor trustees of the Registrant are Michael  McLaughlin and W.
          Thomas Hudson.

               (1) Each of the above has a  principal  business  address  at 767
          Fifth Avenue, New York, NY 10153

         (c)      Not applicable


Item 30. 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 31. MANAGEMENT SERVICES

         None.


Item 32. 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  to file a  post-effective  amendment,
          using financial statements which need not be certified, within four to
          six  months  from  the  effective  date  of   Registrant's   1933  Act
          Registration Statement.
<PAGE>

                                   SIGNATURES


Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company Act of 1940 the Registrant has duly caused this  Registration  Statement
and/or any  amendment  thereto  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
31st day of December, 1997

                                                    LORD ABBETT INVESTMENT TRUST


                                                    By      S/ Robert S. Dow
                                                           Robert S. Dow
                                                           Chairman of the Board

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.



                                   Chairman, President
S/ Robert S. Dow                   and Trustee                        12/31/97
Robert S. Dow                      (Title)                             (Date)


                                   Vice President and
S/ Keith F. O'Connor               Chief Financial Officer             12/31/97
Keith F. O'Connor                  (Title)                             (Date)


S/ E. Wayne Nordberg               Trustee                            12/31/97
E. Wayne Nordberg                  (Title)                             (Date)


S/ Stewart S. Dixon                Trustee                            12/31/97
Stewart S. Dixon                   (Title)                             (Date)


S/ John C. Jansing                 Trustee                            12/31/97
John C. Jansing                    (Title)                             (Date)


S/ C. Alan MacDonald               Trustee                            12/31/97
C. Alan MacDonald                  (Title)                             (Date)


S/ Hansel B. Millican, Jr.         Trustee                            12/31/97
Hansel B. Millican, Jr.            (Title)                             (Date)


S/ Thomas J. Neff                  Trustee                            12/31/97
Thomas J. Neff                     (Title)                             (Date)


S/ E. Thayer Bigelow               Trustee                            12/31/97
E. Thayer Bigelow                  (Title)                             (Date)



 
                          LORD ABBETT INVESTMENT TRUST

                                  AMENDMENT TO
                              DECLARATION OF TRUST


     The  undersigned,  being at least a majority of the Trustees of Lord Abbett
Investment Trust, a Delaware business trust (the "Trust"), organized pursuant to
a  Declaration  of Trust dated  August 16, 1993 (the  "Declaration"),  do hereby
establish,  pursuant  to Section 5.3 of the  Declaration,  two new series of the
Trust to be designated as (i) Strategic Core Series;  and (ii) Core Series.  The
initial class of shares for each series shall be designated  the Class Y shares.
Any variations  between such classes as to purchase price,  determination of net
asset value,  the price,  terms and manner of  redemption,  special and relative
rights as to  dividends  and on  liquidation,  and  conditions  under which such
classes  shall  have  separate  voting  rights,  shall  be as set  forth  in the
Declaration or as elsewhere determined by the Board of Trustees of the Trust.

     This instrument shall constitute an amendment to the Declaration.

     IN WITNESS WHEREOF, the undersigned have executed this instrument this 12th
day of November, 1997.

/s/Robert S. Dow                                  /s/John C. Jansing

- ---------------------------------           ------------------------------
Robert S. Dow                                          John C. Jansing

/s/E. Wayne Nordberg                              /s/C. Alan MacDonald

- ---------------------------------           ------------------------------
E. Wayne Nordberg                                    C. Alan MacDonald

/s/E. Thayer Bigelow                              /s/Hansel B. Millican

- ---------------------------------           ------------------------------
E. Thayer Bigelow                                    Hansel B. Millican, Jr.

/s/Stewart S. Dixon                               /s/Thomas J. Neff

- ---------------------------------           ------------------------------
Stewart S. Dixon                                     Thomas J. Neff









                                   CORE SERIES

                             Addendum to Management
                          Agreement between Lord Abbett
                     Investment Trust and Lord, Abbett & Co.
                    DATED OCTOBER 20, 1993 (THE "AGREEMENT")


         Lord,  Abbett & Co. and Lord Abbett  Investment  Trust (the "Trust") on
behalf of CORE SERIES  ("Series") do hereby agree that (a) the annual management
fee rate for the Series with  respect to paragraph 2 of the  Agreement  shall be
 .50 of 1% of the  average  daily net assets of the Series and (b) the  repayment
provisions  pursuant to paragraph 5 of the Agreement  shall not be applicable to
the Series.

         For purposes of Section 15 (a) of the  Investment  Company Act of 1940,
as amended,  this  Addendum and the  Agreement  shall  together  constitute  the
investment advisory contract of the Series.





                               LORD, ABBETT & CO.


                                    BY:     ________________________
                                            Managing Partner


                          LORD ABBETT INVESTMENT TRUST
                     (on behalf of Lord Abbett Core Series)


                                    BY:  _______________________
                                            Vice President




Dated:           , 1997



<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 031
   <NAME> BALANCED SERIES - CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             DEC-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                         14730761
<INVESTMENTS-AT-VALUE>                        16050059
<RECEIVABLES>                                   249159
<ASSETS-OTHER>                                 1788371
<OTHER-ITEMS-ASSETS>                             57548
<TOTAL-ASSETS>                                18145137
<PAYABLE-FOR-SECURITIES>                       3425859
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2973
<TOTAL-LIABILITIES>                            3428832
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      13015249
<SHARES-COMMON-STOCK>                          1030414
<SHARES-COMMON-PRIOR>                           820404
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           11894
<ACCUMULATED-NET-GAINS>                         373518
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1319298
<NET-ASSETS>                                  14716305
<DIVIDEND-INCOME>                                64738
<INTEREST-INCOME>                               218417                        
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   57762
<NET-INVESTMENT-INCOME>                         225393
<REALIZED-GAINS-CURRENT>                        382989
<APPREC-INCREASE-CURRENT>                        56224
<NET-CHANGE-FROM-OPS>                           695457
<EQUALIZATION>                                    4365
<DISTRIBUTIONS-OF-INCOME>                       205963
<DISTRIBUTIONS-OF-GAINS>                        142310
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         215284
<NUMBER-OF-SHARES-REDEEMED>                      31734
<SHARES-REINVESTED>                              26460
<NET-CHANGE-IN-ASSETS>                         3309983
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       157777
<OVERDISTRIB-NII-PRIOR>                          31055
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            40535
<INTEREST-EXPENSE>                                   0
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<PER-SHARE-NAV-BEGIN>                            11.81
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<PER-SHARE-DISTRIBUTIONS>                         .170
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<PER-SHARE-NAV-END>                              12.01
<EXPENSE-RATIO>                                    .53
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 033
   <NAME> BALANCED SERIES - CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             DEC-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                         14730761   
<INVESTMENTS-AT-VALUE>                        16050059
<RECEIVABLES>                                   249159
<ASSETS-OTHER>                                 1788371
<OTHER-ITEMS-ASSETS>                             57548
<TOTAL-ASSETS>                                18145137
<PAYABLE-FOR-SECURITIES>                       3425859
<SENIOR-LONG-TERM-DEBT>                              0 
<OTHER-ITEMS-LIABILITIES>                         2973
<TOTAL-LIABILITIES>                            3428832
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      13015249 
<SHARES-COMMON-STOCK>                           195188
<SHARES-COMMON-PRIOR>                           145714
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           19075
<ACCUMULATED-NET-GAINS>                         373518
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1319298
<NET-ASSETS>                                  14716305
<DIVIDEND-INCOME>                                11340
<INTEREST-INCOME>                                39386                     
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   19875
<NET-INVESTMENT-INCOME>                          30851
<REALIZED-GAINS-CURRENT>                        382989
<APPREC-INCREASE-CURRENT>                        56224
<NET-CHANGE-FROM-OPS>                           695457
<EQUALIZATION>                                    4365
<DISTRIBUTIONS-OF-INCOME>                        31058
<DISTRIBUTIONS-OF-GAINS>                         24938
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          57637
<NUMBER-OF-SHARES-REDEEMED>                      11959
<SHARES-REINVESTED>                               3796
<NET-CHANGE-IN-ASSETS>                         3309983
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       157777
<OVERDISTRIB-NII-PRIOR>                          23353
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<PER-SHARE-NAV-BEGIN>                            11.79
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<EXPENSE-RATIO>                                   1.02
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</TABLE>

<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>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             DEC-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                          7331717
<INVESTMENTS-AT-VALUE>                         7269118
<RECEIVABLES>                                   142733
<ASSETS-OTHER>                                   16434
<OTHER-ITEMS-ASSETS>                           5297562
<TOTAL-ASSETS>                                12725847
<PAYABLE-FOR-SECURITIES>                       1510283
<SENIOR-LONG-TERM-DEBT>                              0                    
<OTHER-ITEMS-LIABILITIES>                        31322
<TOTAL-LIABILITIES>                            1541605
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      13130228
<SHARES-COMMON-STOCK>                          1016917
<SHARES-COMMON-PRIOR>                          1103825
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           91295
<ACCUMULATED-NET-GAINS>                      (1851738)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (62599)
<NET-ASSETS>                                  11184242
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               154851
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   13824
<NET-INVESTMENT-INCOME>                         141027
<REALIZED-GAINS-CURRENT>                       (28258)
<APPREC-INCREASE-CURRENT>                     (200883)
<NET-CHANGE-FROM-OPS>                            88594
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       127527
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         496090
<NUMBER-OF-SHARES-REDEEMED>                     602580
<SHARES-REINVESTED>                              19582
<NET-CHANGE-IN-ASSETS>                       (1512110)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1823481)
<OVERDISTRIB-NII-PRIOR>                          94821
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            11827
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  24647
<AVERAGE-NET-ASSETS>                           4743621
<PER-SHARE-NAV-BEGIN>                             4.42
<PER-SHARE-NII>                                   .129
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<PER-SHARE-DIVIDEND>                              .126
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                4.34
<EXPENSE-RATIO>                                     .29
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<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>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             DEC-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                          7331717
<INVESTMENTS-AT-VALUE>                         7269118
<RECEIVABLES>                                   142733
<ASSETS-OTHER>                                   16434
<OTHER-ITEMS-ASSETS>                           5297562
<TOTAL-ASSETS>                                12725847
<PAYABLE-FOR-SECURITIES>                       1510283
<SENIOR-LONG-TERM-DEBT>                              0                         
<OTHER-ITEMS-LIABILITIES>                        31322
<TOTAL-LIABILITIES>                            1541605
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      13130228
<SHARES-COMMON-STOCK>                          1560897
<SHARES-COMMON-PRIOR>                          1771304
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          146547
<ACCUMULATED-NET-GAINS>                      (1851738)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (62599)
<NET-ASSETS>                                  11184242
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               231690
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   55020
<NET-INVESTMENT-INCOME>                         176670
<REALIZED-GAINS-CURRENT>                       (28258)
<APPREC-INCREASE-CURRENT>                     (200883)
<NET-CHANGE-FROM-OPS>                            88594
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       186951
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          80408
<NUMBER-OF-SHARES-REDEEMED>                     317992
<SHARES-REINVESTED>                              27177
<NET-CHANGE-IN-ASSETS>                       (1512110)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (1823481)
<OVERDISTRIB-NII-PRIOR>                         146282
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            18130
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  71625
<AVERAGE-NET-ASSETS>                           7271719
<PER-SHARE-NAV-BEGIN>                             4.42
<PER-SHARE-NII>                                   .106
<PER-SHARE-GAIN-APPREC>                         (.080)
<PER-SHARE-DIVIDEND>                              .106
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               4.34
<EXPENSE-RATIO>                                    .76
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<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>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             DEC-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                       3617098347
<INVESTMENTS-AT-VALUE>                      3598075062
<RECEIVABLES>                               1255491276
<ASSETS-OTHER>                               199981198
<OTHER-ITEMS-ASSETS>                             13935
<TOTAL-ASSETS>                              5053561471
<PAYABLE-FOR-SECURITIES>                    2611548140
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     20707302
<TOTAL-LIABILITIES>                         2632255442
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    3044636141
<SHARES-COMMON-STOCK>                        876325120
<SHARES-COMMON-PRIOR>                       1000109092
<ACCUMULATED-NII-CURRENT>                     25863022
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (630211788)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      19023285
<NET-ASSETS>                                2421306029
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            110805282
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                11040966
<NET-INVESTMENT-INCOME>                       99764316
<REALIZED-GAINS-CURRENT>                    (58174299)
<APPREC-INCREASE-CURRENT>                   (66783364) 
<NET-CHANGE-FROM-OPS>                       (15752194)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     95776373
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                       12668315
<NUMBER-OF-SHARES-REDEEMED>                  154029820
<SHARES-REINVESTED>                           17577533
<NET-CHANGE-IN-ASSETS>                     (485985136)
<ACCUMULATED-NII-PRIOR>                       21875412
<ACCUMULATED-GAINS-PRIOR>                  (576387512)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          5943618
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               11040966
<AVERAGE-NET-ASSETS>                        2383978842
<PER-SHARE-NAV-BEGIN>                             2.63
<PER-SHARE-NII>                                   .107
<PER-SHARE-GAIN-APPREC>                         (.115)
<PER-SHARE-DIVIDEND>                              .102
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<PER-SHARE-NAV-END>                               2.52
<EXPENSE-RATIO>                                    .46
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<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>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                       3617098347
<INVESTMENTS-AT-VALUE>                      3598075062
<RECEIVABLES>                               1255491276
<ASSETS-OTHER>                               199981198
<OTHER-ITEMS-ASSETS>                             13935
<TOTAL-ASSETS>                              5053561471
<PAYABLE-FOR-SECURITIES>                    2611548140
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     20707302
<TOTAL-LIABILITIES>                         2632255442
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    3044636141
<SHARES-COMMON-STOCK>                          3540372
<SHARES-COMMON-PRIOR>                          1820279
<ACCUMULATED-NII-CURRENT>                        10015
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (630211788)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      19023285
<NET-ASSETS>                                2421306029
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               310388
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<NET-INVESTMENT-INCOME>                         254381
<REALIZED-GAINS-CURRENT>                    (58174299)
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<SHARES-REINVESTED>                              35153
<NET-CHANGE-IN-ASSETS>                     (485985136)
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<ACCUMULATED-GAINS-PRIOR>                  (576387512)
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<PER-SHARE-NAV-BEGIN>                             2.63
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<EXPENSE-RATIO>                                    .82
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</TABLE>

<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>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-START>                            JUL-15-1996
<PERIOD-END>                               MAY-31-1997
<INVESTMENTS-AT-COST>                       3617098347
<INVESTMENTS-AT-VALUE>                      3598075062
<RECEIVABLES>                               1255491276
<ASSETS-OTHER>                               199981198
<OTHER-ITEMS-ASSETS>                             13935
<TOTAL-ASSETS>                              5053561471
<PAYABLE-FOR-SECURITIES>                    2611548140
<SENIOR-LONG-TERM-DEBT>                              0
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<PAID-IN-CAPITAL-COMMON>                    3044636141
<SHARES-COMMON-STOCK>                         80596662
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<NET-INVESTMENT-INCOME>                        9186772
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<NUMBER-OF-SHARES-REDEEMED>                   25762387
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<ACCUMULATED-GAINS-PRIOR>                  (576387512)
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<GROSS-EXPENSE>                                2012931
<AVERAGE-NET-ASSETS>                         240162104
<PER-SHARE-NAV-BEGIN>                             2.63
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</TABLE>


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