LORD ABBETT INVESTMENT TRUST
497, 1999-02-11
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SUPPLEMENT TO THE CORE PROSPECTUS DATED MARCH 16, 1998, AS SUPPLEMENTED
FEBRUARY 11, 1999 AND
SUPPLEMENT TO THE STRATEGIC PROSPECTUS DATED NOVEMBER 29, 1998, AS
SUPPLEMENTED FEBRUARY 11, 1999
FOR THE LORD ABBETT INVESTMENT TRUST

<PAGE>

SUPPLEMENT EFFECTIVE DATE: FEBRUARY 11, 1999



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
shares of 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 16, 1998, as supplemented February
11, 1999.

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.

CONTENTS                                 PAGE

        1       Investment Objective    2

        2       Fee Table               2


        3       How We Invest           2

        4       Purchases               7


        5       Our Management           8

        6       Dividends, Capital Gains 
                Distributions and Taxes 9

        7       Redemptions             9
        8       Performance             10

<PAGE>
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 more 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 e  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:

     oU.S.  Government  Debt Securities  Sector -- consisting  primarily of debt
obligations of the U.S. government, its agencies and instrumentalities.

     0Mortgage-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

     0Investment  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., Standard & Poor's Ratings Services,  Duff & Phelps Inc., or Fitch
Investors Service, 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 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. 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.
<PAGE>
Government  securities  may  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
guaranteed  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  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 Fund may invest in mortgage obligations that are "stripped"; that is,
the security is divided into two parts, one of which receives some or all of the
principal  payments  ("POs") and the other of which  receives some or all of the
interest  ("IOs").  Stripped  securities are subject to increased  volatility in
price due to  interest  rate  changes and have the  additional  risk that if the
principal  underlying the stripped  security is prepaid  rapidly (in the case of
the  IOs) or  slowly  (in the  case  of the  POs),  the  stripped  security  may
depreciate  in  value.   Stripped  securities  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 Fund.  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 International Bonds. 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  U.S.  Government  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  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
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.  

     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.


     International  Bonds.  The Series may invest in the  securities  of foreign
issuers payable in U.S. dollars ("International Bonds"). 

     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 guaranteed 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  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.  

     Short Sales.  The Series may attempt t limit exposure to a possible  market
decline in the value of portfolio  securities  

<PAGE>
     through short sales of securities  which the  management  believes  possess
volatility  characteristics  similar to those  being  hedged.  To effect  such a
transaction,  the Series may 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 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  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 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  investment 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
instruments 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.

     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

<PAGE>
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 or 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."  

     Risk  Factors -  International  Securities.  Securities  markets of foreign
countries in which we may invest generally are not subject to the same degree of
regulation as the U.S. markets and may be more volatile and less liquid than the
major  U.S.  markets.  There  may  be  less  publicly-available  information  on
publicly-traded  companies,  banks and  governments  in foreign  countries  than
generally  is the case for  such  entities  in the  United  States.  The lack of
uniform accounting  standards and practices among countries impairs the validity
of direct comparisons of valuation measures (such as price/earnings  ratios) for
securities in different countries.  Other  considerations  include political and
social   instability,   expropriation,   higher  transaction   costs,   currency
fluctuations, withholding taxes that cannot be passed through as a tax credit or
reduction to shareholders and different securities settlement practices. Foreign
securities may be traded on days that we do not value our portfolio  securities,
and,  accordingly,  net asset values may be significantly  affected on days when
shareholders do not have access to the Series. 
<PAGE>
     We will not change our investment objective without shareholder approval.

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
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 Lord  Abbett  Fund you  selected
(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.
<PAGE>
     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 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 - 101000695,  Account Number: 9878002611, FBO:
(account  name)  and  (account   number.)  Specify  the  complete  name  of  the
fund/series  of your  choice,  note Class Y shares and include  your new account
number and your name. To add to an existing  account,  wire to: United  Missouri
Bank of Kansas City, N.A., Routing number , account number:  101000695,  Account
Number:  9878002611,  FBO:  (account  name) and  (account  number).  Specify the
complete name of the fund/series of your choice, 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 69 years and currently  manages  approximately  $27
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
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 of Sanford C. Bernstein & Co., Inc.
since 1992. 

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%.  Because Lord Abbett  intends to waive the payment of
the management fee for the year 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 zero  percent
for such period. 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 zero percent.

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. A supplemental  capital gains  distribution also may be paid
in December.

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. 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% and the "holding  period" for  long-term  capital  gains
treatment is increased from one-year to eighteen months.  (If the taxpayer is in
the 15% tax  bracket,  the rate is 10%.) An  individual,  estate or trust with a
holding  period  greater  than one year but less than 18 months  has  "mid-term"
gains  taxed at a  maximum  rate of 28% (15% if the  taxpayer  is in the 15% tax
bracket).  Although it has not yet done so,  Treasury has the authority to amend
the tax law governing taxation of shareholders of a regulated investment company
to  reflect  these  changes.  Although  the  Series  does not know when and what
regulations will be promulgated, it believes that the regulations should provide
that whether  received in cash or shares,  regardless of how long a taxpayer has
held the shares of the  Series,  distributions  derived  from net  long-term  or
mid-term  capital gains will be taxable to shareholders as long-term or mid-term
capital gains, respectively. 

     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.

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.
<PAGE>
If you cannot use the expedited redemption  procedures described above to redeem
shares directly,  send your request to Lord Abbett  Investment Trust - Strategic
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-1398
(3/98)

   Lord Abbett 

  Prospectus `98
    March 16, 1998

Lord Abbett
Investment Trust



Core Series

<PAGE>

LORD ABBETT STRATEGIC CORE FUND
The General Motors Building
767 Fifth Avenue 
New York, NY 10153-0203
800-426-1130

     This  Prospectus  sets forth  concisely the  information  about Lord Abbett
Strategic  Core Fund  (sometimes  referred  to as "we" or the  "Fund")  that you
should know before  investing.  Please read this Prospectus before investing and
retain it for future reference.  

     The Fund's  investment  objective  is income and  capital  appreciation  to
produce a high total  return.  In seeking this  investment  objective,  the Fund
invests  in  U.S.  Government  debt  securities;   mortgage-backed   securities;
investment  grade debt  securities;  foreign debt  securities;  and  high-yield,
lower-rated debt securities.  There can be no assurance that we will achieve our
objective.

     The Statement of Additional  information  dated November 29, 1998, has been
filed  with the  Securities  and  Exchange  Commission  and is  incorporated  by
reference into this Prospectus.  You may obtain it without charge, by writing to
the Fund or by calling  800-874-3733 and asking for "Part B of the Prospectus --
The Statement of Additional  Information." In addition, the Commission maintains
a website  (http://www.sec.gov)  that  contains  the  Statement  of  Additional,
material incorporated by reference,  and other information regarding registrants
that file electronically with the Commission. The date of this Prospectus and of
the Statement of Additional  Information  is November 29, 1998, as  supplemented
February 11, 1999.

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 Fund 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 Fund involves risks, including the possible loss of principal.

CONTENTS        PAGE
        1       Investment Objective    2

        2       Fee Table               2


        3       How We Invest           2

        4       Purchases               7


        5       Our Management          8

        6       Dividends, Capital Gains9 
                Distributions and Taxes 9

        7       Redemptions             9
        8       Performance             10

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 Fund over time
will have volatility approximating 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.

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

SHAREHOLDER  TRANSACTION  EXPENSES                      CLASS Y 
(AS A PERCENTAGE OF OFFERING  PRICE)                    Shares
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  Fee(2)  (See "Our  Management")            0.50% 
Other Expenses(2) (See "Our Management")               0.26% 
Total Operating Expenses(2)                            0.76%


     Example:  Assume  an  annual  return  of 5% and 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      $24

(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 Fund.  (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 Fund.

3 HOW WE INVEST
The  management  of the Fund will  allocate  the  Fund's  investments  among the
following five sectors of the fixed-income securities markets:

     oU.S.  Government  Debt Securities  Sector -- consisting  primarily of debt
obligations of the U.S. government, its agencies and instrumentalities;


     oMortgage-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;


     oInvestment  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., Standard & Poor's Ratings Services,  Duff & Phelps Inc., or Fitch
Investors Service or the equivalent in management's opinion;


     oHigh-Yield  Sector--  consisting of high yield,  lower- rated, higher risk
U.S. and foreign fixed-income securities; and


     oInternational  Sector-- consisting of obligations of foreign  governments,
their  agencies  and  instrumen-  talities  and  other  fixed-income  securities
denomina- ted in foreign currency.

Lord,  Abbett & Co. ("Lord Abbett") will  continuously  review the allocation of
assets among these five sectors and make  adjustments  as it deems  appropriate.
The U.S.  Government Debt Securities Sector,  Mortgage-Backed  Securities Sector
and Investment Grade Debt Securities  Sector have an aggregate  maximum limit of
100% of the Fund's net assets.  The High-Yield Sector and  International  Sector
each have a maximum limit consisting of 20% of the Fund's net assets.

U.S.  Government  Debt  Securities.  U.S.  Government  securities  include:  (1)
obligations  issued  by  the  U.S.  Treasury,  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 

<PAGE>
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. 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
exhibit  greater price  volatility in response to changes in interest rates than
shorter maturity  securities.  In addition,  component  securities may show even
greater volatility.

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.  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 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 Fund may invest in mortgage obligations that are "stripped";  that is, the
security is divided  into two parts,  one of which  receives  some or all of the
principal  payments  ("POs") and the other of which  receives some or all of the
interest  ("IOs").  Stripped  securities are subject to increased  volatility in
price due to  interest  rate  changes and have the  additional  risk that if the
principal  underlying the stripped  security is prepaid  rapidly (in the case of
the  IOs) or  slowly  (in the  case  of the  POs),  the  stripped  security  may
depreciate  in  value.   Stripped  securities  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 .  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 International Bonds. Some of these are zero coupon securities and
securities issued on a when-issued or delayed-delivery basis.

     High-Yield  Securities.  We seek unusual values in lower-rated,  high yield
debt securities.


     Higher  yield on debt  securities  can occur during  periods of  inflation.
Also,  buying  lower-rated  bonds when the credit risk is above  average but, we
think,  likely to decrease,  can generate  higher yields.  Such debt  securities
normally will consist of secured debt  obligations of the issuer (i.e.,  bonds),
general  unsecured debt  obligations of the issuer (i.e.,  debentures)  and debt
securities  which  are  subordinate  in right of  payment  to other  debt of the
issuer.

Capital appreciation potential is an important consideration in the selection of
portfolio securities.  Capital appreciation may be obtained by: (1) investing in
debt securities when the trend of interest rates is expected to be down, and (2)
investing in debt securities of issuers in financial  difficulties  when, in our
opinion,  the  problems  giving rise to such  difficulties  can be  successfully
resolved,  with a consequent  improvement in the credit standing of the issuers.
Such  investments  involve  corresponding  risks  that  interest  and  principal
payments may not be made if such difficulties are not resolved. In no event will
we invest  more than 5% of our gross  assets at the time of  investment  in debt
securities which are in default as to interest or principal.

International Securities. While the Fund's portfolio investments in foreign debt
securities  may be made in the types of  securities  above,  issued by companies
domiciled in developed countries, investments also may be made in the securities
of companies  domiciled in  developing  countries.  

The Fund may invest  without
limit in U.S. Dollar denominated  American Depository  Receipts ("ADRs"),  which
are  bought  and sold in the  United  States.  The  Series may engage in foreign
currency option and forward contract transactions.

OTHER POLICIES

When-Issued  Securities.  We  may  purchase  U.S.  Government  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  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 Fund.  This
strategy will have little or no transaction cost or adverse tax consequences for
the  Fund.  Transaction  costs  normally  will  exclude  brokerage  because  our
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.  

     Lending  Securities.  We  may  engage  in  the  lending  of  our  portfolio
securities.  These  loans may not exceed  30% of the value of the  Fund's  total
assets. In such an arrangement,  the Fund 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 AAA, 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 Fund
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
securities  reasonably  acceptable  to the Fund,  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

<PAGE>
     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 Fund in such  securities,  initially
determined to be liquid,  could have the effect of diminishing  the level of the
Fund's 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.

     International  Bonds.  The Fund may  invest in the  securities  of  foreign
issuers payable in U.S. dollars ("International Bonds").

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
Fund. These securities are frequently supported by a credit enhancement, such as
a letter of credit, a guaranteed 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 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.

Short Sales. The Fund 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 Fund may borrow the  security  sold
short to make  delivery to the buyer.  The Fund 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 Fund is required to pay the
lender any accrued  interest or dividends  and may be required to pay a premium.

The Fund will realize a gain if the security  declines in price between the date
of the short sale and the date on which the Fund replaces the borrowed security.
On the other  hand,  the Fund will incur a loss as a result of the short sale if
the price of the security  increases  between those dates. 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 Fund 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 Fund's net assets. A short sale is  "against-the-box" to the extent
that the Fund 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 Fund's portfolio from interest rate fluctuations,  the Fund may
engage in interest  rate swaps and trade in interest  rate "caps,"  "floors" and
"collars." The Fund 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 Fund  anticipates
purchasing.  The Fund intends to use these transactions primarily as a hedge and
not as a speculative  investment.  There is no assurance that these transactions
will be successful. The Fund will not sell interest rate caps or floors where it
does not own  securities  or other  instruments  providing the income stream the
Fund may be obligated to pay.  

Interest  rate swaps are the exchange by the Fund
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  primarily  entered  into to  permit  adjustments  to the  portfolio  due to
interest  rate  changes. 

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 such interest rate floor.  
<PAGE>
     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 Fund may make investment
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 Fund might use Eurodollar futures contracts and options thereon
to hedge against  changes in LIBOR,  to which many interest rate swaps and fixed
income instruments are linked.  

     Investments  in Eurodollar  instruments  are traded on domestic and foreign
securities  exchanges.  To the extent  traded on foreign  securities  exchanges,
risks may  include  less  regulation;  foreign,  political,  legal and  economic
factors;  less availability of information;  different  settlement practices and
currency fluctuations.

     Options and Futures. The Fund
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 Fund 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 Fund would not be subject absent the use of these strategies.
Risks  inherent  in the  use of  options  and  futures  include:  (1)  imperfect
correlation  between the price of options  and  futures and options  thereon and
movements in the prices of the securities being hedged; (2) the fact that skills
needed  to use  these  strategies  are  different  from  those  needed to select
portfolio securities;  (3) the possible absence of a liquid secondary market for
any  particular  instrument at any time;  and (4) 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 Fund investments (such
as short sales other than those  "against  the box,"  options and  futures),  in
addition to other  requirements,  require that the Fund segregate cash or liquid
assets with its  custodian  to the extent  Fund  obligations  are not  otherwise
"covered" through ownership of the underlying security,  financial instrument or
currency.  In general,  either the full amount or any  obligation by the Fund 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 Fund 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 Fund 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 Fund's 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 Fund within the
average  duration  range  mentioned  above under  "Investment  Objective."  

     Risk  Factors -  International  Securities.  Securities  markets of foreign
countries in which we may invest generally are not subject to the same degree of
regulation as the U.S. markets and may be more volatile and less liquid than the
major  U.S.  markets.  There  may  be  less  publicly-available  information  on
publicly-traded  companies,  banks and  governments  in foreign  countries  

<PAGE>
     than generally is the case for such entities in the United States. The lack
of uniform  accounting  standards  and  practices  among  countries  impairs the
validity of direct comparisons of valuation measures for securities in different
countries.  Other  considerations  include  political  and  social  instability,
expropriation,  higher transaction  costs,  currency  fluctuations,  withholding
taxes that cannot be passed through as a tax credit or reduction to shareholders
and different securities settlement practices.  Foreign securities may be traded
on days that we do not value our portfolio  securities,  and,  accordingly,  net
asset values may be significantly affected on days when shareholders do not have
access to the Fund. 

Risk Factors -- High Yield. We may invest  substantially  in
lower-rated  bonds  because  they tend to have higher  yields.  In general,  the
market for lower-rated  bonds is more limited than that for  higher-rated  bonds
and,  therefore,  may be less liquid.  Market  prices of  lower-rated  bonds may
fluctuate  more  than  those of  higher-rated  bonds,  particularly  in times of
economic  change and stress.  In  addition,  because the market for  lower-rated
corporate debt securities has in past years experienced wide fluctuations in the
values of  certain  of these  securities,  past  experience  may not  provide an
accurate indication of the future performance of that market or of the frequency
of default,  especially during periods of recession.  Objective pricing data for
lower-rated bonds may be more limited than for higher-rated  bonds and valuation
of such  securities  may be more  difficult  and require  greater  reliance upon
judgment.  

While the market for lower-rated bonds may be relatively  insensitive
to interest  rate changes,  the market prices of these bonds  structured as zero
coupon or  pay-in-kind  securities  may be affected to a greater  extent by such
changes  and thus may be more  volatile  than prices of  lower-rated  securities
paying interest periodically in cash.  Lower-rated bonds that are callable prior
to maturity  may be more  susceptible  to  refunding  during  periods of falling
interest rates, requiring replacement with lower-yielding securities. 

Since the
risk of default  generally is higher among  lower-rated  bonds, the research and
analysis  performed by Lord Abbett are especially  important in the selection of
such bonds. If bonds are rated BB/Ba or lower, they are described as "high-yield
bonds" because of their generally higher yields and are referred to colloquially
as "junk bonds" because of their greater risks. In selecting  lower-rated  bonds
for investment,  Lord Abbett does not rely entirely upon ratings, which evaluate
only the safety of principal  and  interest,  not market value risk,  and which,
furthermore, may not accurately reflect an issuer's current financial condition.
We do not have any minimum rating  criteria for our  investments in bonds.  Some
issuers may default as to principal and/or interest  payments  subsequent to our
purchase of their  securities.  Through portfolio  diversification,  good credit
analysis and attention to current  developments and trends in interest rates and
economic  conditions,  investment  risk  can be  reduced,  although  there is no
assurance that losses will not occur. 

     Laws enacted from time to time could limit
the tax or other advantages of, and the issuance of, lower-rated  securities and
could  adversely  affect their secondary  market and the financial  condition of
their issuers. On the other hand, such legislation (curtailing the supply of new
issues) could improve the  liquidity,  market values and demand for  outstanding
issues. 

We  will  not  change  our  investment  objective  without  shareholder
approval.

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
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  

<PAGE>
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 Lord  Abbett  Fund you  selected
(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 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 - 101000695, bank account number:  9878002611,
FBO:  (account name) and (your Lord Abbett account number.) Specify the complete
name of the fund,  note Class Y shares and include  your new account  number and
your name.  To add to an existing  account,  wire to:  United  Missouri  Bank of
Kansas City, N.A., routing number - 101000695, bank account number:  9878002611,
FBO: (account name) and (your Lord Abbett account number).  Specify the complete
name of the fund,  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 Class Y shares of any other eligible 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 Fund pursuant to a Management Agreement.  Lord Abbett has been an investment
manager for over 69 years and currently  manages  approximately $30 billion in a
family  of  mutual  funds  and other  advisory  accounts.  Under the  Management
Agreement,  Lord  Abbett  is  obligated  to  provide  the Fund  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 Fund's portfolio
and certain other costs.  Lord Abbett provides  similar services to twelve other
Lord  Abbett-sponsored  funds  having  various  investment  objectives  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 of Sanford C. Bernstein & Co., Inc.
since 1992.

<PAGE>       
Under the Management Agreement, the Fund 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%. Because Lord Abbett intends to waive the payment of the management
fee for the year after commencement of operations of the Fund, the effective fee
payable to Lord Abbett by the Fund as a percentage  of average  daily net assets
is  expected  to be at the  annual  rate of zero  percent  for such  period.  In
addition,  we pay all expenses not expressly assumed by Lord Abbett.  The Fund's
ratio of expenses,  including management fee expenses, to average net assets for
such one-year period is expected to be zero percent.

     The Fund.  The Fund is a separate  series of Lord Abbett  Investment  Trust
(the  "Company"),  an open-end  management  investment  company  organized  as a
business  trust on August 16,  1993.  The  Company  currently  consists  of five
series. Only Class Y shares of the Fund are being offered in this Prospectus.


6 DIVIDENDS, CAPITAL GAINS DISTRIBUTIONS AND TAXES
With respect to the Fund,  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 Fund 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 Fund in that year if they are paid before February 1 of the
following year. A supplemental  capital gains  distribution  also may be paid in
December.

The Fund  intends  to meet the  requirements  of  Subchapter  M of the  Internal
Revenue Code.  The Fund 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 Fund's
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 12 months.  (If the taxpayer is in
the 15% tax  bracket,  the rate is 10%.)  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.

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.

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  

<PAGE>
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 - Strategic  Core Fund (P.O. Box 419100,
Kansas City,  Missouri  64141) with  signature(s)  and any legal capacity of the
signer(s) guaranteed by an eligible guarantor.  


     8  PERFORMANCE  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.

Yield and Total  Return.  Yield and total return data may, from time to time, be
included in  advertisements  about the Fund.  The Fund' "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 Fund's
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 Fund's 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
Fund at the net asset value.  When total return is quoted for Fund's 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
Fund's 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 11/98
(11/98)

   Lord Abbett 
  Prospectus `98
  November 29, 1998

LORD ABBETT 
STRATEGIC CORE FUND


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