VAN KAMPEN FOCUS PORTFOLIOS SERIES 189
487, 1999-11-23
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                              MEMORANDUM OF CHANGES
                     VAN KAMPEN FOCUS PORTFOLIOS, SERIES 189

         The Prospectus filed with Amendment No. 1 of the Registration Statement
on Form S-6 has been revised to reflect information regarding the deposit of Van
Kampen Focus Portfolios, Series 189 on November 23, 1999. An effort has been
made to set forth below each of the major changes and also to reflect the same
by blacklining the marked counterparts of the Prospectus submitted with the
Amendment.

          Cover Page. The date of the Prospectus has been completed.

          Pages 2-3. "The Summary of Essential Financial Information" section
               and "Fee Table" have been completed.

          Pages 4-7. Revisions have been made and the portfolios have been
               completed.

          Pages 8-10. The descriptions of the Securities issuers have been
               completed.

          Pages 11-12. The Report of Independent Certified Public Accountants
               and Statements of Condition have been completed.





                                                              FILE NO. 333-89027
                                                                    CIK #1025520


                       SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549-1004


                                Amendment No. 1
                                       to
                                    Form S-6

For Registration under the Securities Act of 1933 of Securities of Unit
Investment Trusts Registered on Form N-8B-2.


A.   Exact Name of Trust: VAN KAMPEN FOCUS PORTFOLIOS, SERIES 189

B.   Name of Depositor: VAN KAMPEN FUNDS INC.

C.   Complete address of Depositor's principal executive offices:

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

D.   Name and complete address of agents for service:

CHAPMAN AND CUTLER             VAN KAMPEN FUNDS INC.
Attention:  Mark J. Kneedy     Attention:  A. Thomas Smith III, General Counsel
111 West Monroe Street         One Parkview Plaza
Chicago, Illinois  60603       Oakbrook Terrace, Illinois  60181


E.   Title of securities being registered: Units of proportionate interest

F.   Approximate date of proposed sale to the public:

             AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THE
                             REGISTRATION STATEMENT

/ X / Check box if it is proposed that this filing will become effective at 2:00
p.m. on November 23, 1999 pursuant to Rule 487.




                                   Van Kampen
                              Focus Portfolios(SM)
                       A Division of Van Kampen Funds Inc.


The Roaring 2000sSM Trust, Series 4A
The Roaring 2000sSM Trust, Series 4B


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


   Van Kampen Focus Portfolios, Series 189 includes the unit investment trusts
described above (the "Trusts"). Each Trust invests in a portfolio of stocks
selected by Van Kampen based on concepts outlined in The Roaring 2000s written
by Harry S. Dent, Jr. Each Trust seeks to increase the value of your Units. We
offer the portfolio in two separate Trusts with different maturity options. The
Series A Trust terminates in 15 months for investors with shorter investment
horizons. The Series B Trust terminates in five years for investors with longer
investment horizons. Of course, we cannot guarantee that a Trust will achieve
its objective.


                                November 23, 1999


       You should read this prospectus and retain it for future reference.

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

  The Securities and Exchange Commission has not approved or disapproved of the
 Units or passed upon the adequacy or accuracy of this prospectus. Any contrary
                     representation is a criminal offense.
<TABLE>
<CAPTION>


                   Summary of Essential Financial Information
                                November 23, 1999

                                                                                          Series A          Series B
Public Offering Price                                                                       Trust             Trust
                                                                                        ------------      ------------
<S>                                                                                     <C>               <C>
Aggregate value of Securities per Unit (1)                                              $     9.900       $    9.900
Sales charge                                                                                  0.295            0.450
  Less deferred sales charge                                                                  0.195            0.350
Public offering price per Unit (2)                                                      $    10.000       $   10.000

Trust Information
Initial number of Units (3)                                                                  15,098           15,098
Aggregate value of Securities (1)                                                       $   149,473       $  149,473
Estimated initial distribution per Unit (4)                                             $      0.04       $     0.04
Estimated annual dividends per Unit (4)                                                 $   0.08227       $  0.08227
Redemption price per Unit (5)                                                           $      9.70       $     9.55
</TABLE>

General Information
Initial Date of Deposit                               November 23, 1999
Series A Mandatory Termination Date                   February 26, 2001
Series B Mandatory Termination Date                   November 23, 2004
Record Dates                                          June 10 and December 10
Distribution Dates                                    June 25 and December 25



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

(1)  Each Security is valued at the last closing sale price on its principal
     trading exchange or, if not listed, at the last asked price on the business
     day before the Initial Date of Deposit. You will bear all or a portion of
     the expenses incurred in organizing and offering your Trust. The public
     offering price includes the estimated amount of these costs. The Trustee
     will deduct these expenses from your Trust at the end of the initial
     offering period (approximately three months). The estimated amount is
     described on the next page.

(2)  The public offering price will include any accumulated dividends or cash in
     the Income or Capital Accounts.

(3)  At the Evaluation Time on the Initial Date of Deposit, the number of Units
     may be adjusted so that the public offering price per Unit equals $10. The
     number of Units and fractional interest of each Unit will increase or
     decrease to the extent of any adjustment.

(4)  This estimate is based on the most recently declared quarterly dividends or
     interim and final dividends accounting for any foreign withholding taxes.
     Actual dividends may vary due to a variety of factors. See "Risk Factors".

(5)  The redemption price is reduced by any remaining deferred sales charge. The
     redemption price includes the estimated organizational and offering costs.
     The redemption price will not include these costs after the initial
     offering period. See "Rights of Unitholders--Redemption of Units".
<TABLE>
<CAPTION>


                                    Fee Table


                                                                           Series A          Series B
                                                                             Trust             Trust
                                                                         -----------------------------
Transaction Fees (as % of offering price)
<S>                                                                            <C>              <C>
Initial sales charge (1).............................................          1.00%            1.00%
Deferred sales charge (2)............................................          1.95%            3.50%
                                                                         -----------------------------
Maximum sales charge.................................................          2.95%            4.50%
                                                                         =============================

Maximum sales charge on reinvested dividends.........................          1.95%            3.50%
                                                                         =============================


Estimated Organizational Costs per Unit (3)..........................    $   0.01187       $  0.01113
                                                                         =============================
Estimated Annual Expenses per Unit
Trustee's fee and operating expenses.................................    $   0.01521       $  0.01604
Supervisory and evaluation fees......................................    $   0.00500       $  0.00500
                                                                         -----------------------------
Estimated annual expenses per Unit...................................    $   0.02021       $  0.02104
                                                                         =============================
Estimated Costs Over Time
One year.............................................................    $        33       $       48
Three years..........................................................    $        80       $       52
Five years...........................................................            N/A       $       56
Ten years............................................................            N/A              N/A
</TABLE>



   This fee table is intended to assist you in understanding the costs that you
will bear and to present a comparison of fees. The "Estimated Costs Over Time"
example illustrates the expenses you would pay on a $1,000 investment assuming a
5% annual return and redemption at the end of each period. This example assumes
that you reinvest your distributions at the end of each year. The Series A Trust
example assumes that you reinvest your investment into a new trust at the end of
each 15-month period. Of course, you should not consider this example a
representation of actual past or future expenses or annual rate of return which
may differ from those assumed for this example. The sales charge and expenses
are described under "Public Offering" and "Trust Operating Expenses".

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

(1)  The initial sales charge is equal to the difference between the maximum
     sales charge and the deferred sales charge.


(2)  The deferred sales charge for the Series A Trust is actually equal to
     $0.195 per Unit. The deferred sales charge for the Series B Trust is
     actually equal to $0.35 per Unit. These amounts will exceed the percentage
     above if the public offering price per Unit falls below $10 and will be
     less than the percentage above if the public offering price per Unit
     exceeds $10. The deferred sales charge accrues daily from March 10, 2000
     through November 9, 2000. Your Trust pays a proportionate amount of this
     charge on the 10th day of each month beginning in the accrual period until
     paid in full.


(3)  You will bear all or a portion of the expenses incurred in organizing and
     offering your Trust. The Trustee will deduct the actual amount of these
     expenses from your Trust at the end of the initial offering period.



The Roaring 2000sSM Trusts

   Each Trust invests in a separate portfolio of stocks selected using concepts
outlined in The Roaring 2000s written by Harry S. Dent, Jr. Each Trust seeks to
increase the value of your investment over its life.

   The Roaring 2000s is the third book written by Harry S. Dent, Jr. analyzing
economic, technological and demographic trends in society. We designed the
Trusts to take advantage of the insights, philosophies and strategies discussed
in this book. Based on Mr. Dent's current analysis, each portfolio focuses on
stocks from four sectors: Technology, Financials, Health Care and U.S.-based
Multi-Nationals. Each Trust seeks to leverage demographic, economic and
lifestyle trends that may develop over the next 10-15 years. According to Mr.
Dent, some significant changes that may potentially impact the future economy
include:

     o    Aging Baby Boomers reaching their peak spending years

     o    Internet usage and new technologies becoming more mainstream

     o    A shift in the business and organizational structure brought on by the
          Information Age

     o    Rising importance of small- to medium-sized, high growth companies

     o    Growth opportunities from continued global economic development

   Mr. Dent believes that the coming years may bring an era of economic
prosperity and lifestyle changes. For instance, Mr. Dent believes that the
Internet may be as important a catalyst for change in business as the
assembly-line once was for production. Mr. Dent applies the principle of the
"S-curve" in analyzing technologies and social trends in the economy. This
concept shows how products move into mainstream acceptance. The S-curve shows
how products develop in three stages over time: Innovation, Growth and Maturity.
Mr Dent also focuses on the "spending wave". This analysis illustrates how our
economy has correlated closely with birth rates. Over time, the level of births
lagged for peak in family spending has almost paralleled the Dow Jones
Industrial Average adjusted for inflation.

   Of course, we cannot guarantee that your Trust will achieve its objective.
The value of your Units may fall below the price you paid for the Units. You
should read the "Risk Factors" section before you invest.

   About Mr. Dent. Using extensive research developed from years of hands-on
business experience, Mr. Dent seeks to offer a positive and understandable view
of trends in society. He proposes practical applications at all levels: from
personal investments, to business strategies, to jobs and changes in the
workplace, to growth areas for real estate. Mr. Dent received his MBA from
Harvard Business School where he was a Baker Scholar. He graduated number one in
his class at the University of South Carolina with a degree in accounting and
finance. Mr. Dent has worked as a consultant with several Fortune 100 companies
to develop and innovate competitive business strategies. He has been CEO of
several growth companies and has acted as consultant to several leading edge
companies.

   Mr. Dent is the author of the 1993 book, The Great Boom Ahead (revised in
1995). His second book, Job Shock: Four New Principles Transforming Our Work and
Business, was published in 1995 and then re-released in 1996 as The Great Jobs
Ahead. The Roaring 2000s updates key principles of these books, and focuses on
the Internet's rapid move into the mainstream and how our work, organizations,
and living circumstances may change. Mr. Dent also publishes the H.S. Dent
Forecast newsletter. Since 1988 he has been speaking to executives around the
world. He has appeared on "Good Morning America", PBS, CNBC, "The Business
Channel", and has been featured in Fortune, Success, The Wall Street Journal,
and Omni.

   Two Maturity Options. Because different investors have different investment
horizons, we offer two portfolios with different maturities that invest in the
same companies. You should consider Series A if you intend to hold your
investment for 15 months or less. You should consider Series B if you intend to
hold your investment for approximately five years. In either case, you should
consider the impact of price volatility when selecting the appropriate Series.
While Series A and Series B invest in the same companies, they are separate
portfolios and have different sales charges and expenses. As a result, the
performance and exact composition of each Trust may differ.
<TABLE>
<CAPTION>


Series A Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                Current             Cost of
Number                                                     Market Value         Dividend            Securities
of Shares        Name of Issuer (1)                        per Share (2)        Yield (3)           to Trust (2)
    ------------ -----------------------------------       ---------------      -----------             ------------
                Financial Services
<S>               <C>                                      <C>                        <C>           <C>
        136       Charles Schwab Corporation               $        44.000            0.13%         $    5,984.00
         73       Chase Manhattan Corporation                       81.875            2.00               5,976.88
        108       Citigroup, Inc.                                   55.500            1.01               5,994.00
         83       Fifth Third Bancorp                               71.250            1.35               5,913.75
        149       FleetBoston Corporation                           39.750            3.02               5,922.75
         43       J. P. Morgan & Company                           136.688            2.90               5,877.56
         70       Providian Financial Corporation                   84.563            0.24               5,919.38
         83       SunTrust Banks, Inc.                              71.375            1.93               5,924.13
                Health Care
         57       Allergan, Inc.                                   104.125            0.54               5,935.13
         78       Bristol-Myers Squibb Company                      74.938            1.15               5,845.13
        106       Guidant Corporation                               55.938            0.00               5,929.38
         57       Johnson & Johnson                                105.313            1.06               6,002.81
        105       Pharmacia & Upjohn, Inc.                          57.438            1.88               6,030.94
        109       Schering-Plough Corporation                       55.875            0.89               6,090.38
                Multi-Nationals
        106       Colgate-Palmolive Company                         56.625            1.11               6,002.25
         66       MCI WorldCom, Inc.                                88.125            0.00               5,816.25
         54       Procter & Gamble Company                         111.750            1.15               6,034.50
                Technology
         37       America Online, Inc.                             162.313            0.00               6,005.56
         68       Cisco Systems, Inc.                               87.438            0.00               5,945.75
         27       JDS Uniphase Corporation                         228.000            0.00               6,156.00
         67       Microsoft Corporation                             89.875            0.00               6,021.63
+        45       Nokia Oyj                                        130.625            0.34               5,878.13
         78       Oracle Corporation                                77.438            0.00               6,040.13
         62       Texas Instruments, Inc.                           99.063            0.17               6,141.88
         59       VERITAS Software Corporation                     103.125            0.00               6,084.38
    ------------                                                                                      ------------
      1,926                                                                                         $  149,472.68
    ============                                                                                      ============
</TABLE>


See "Notes to Portfolios".

<TABLE>
<CAPTION>

Series B Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                Current             Cost of
Number                                                     Market Value         Dividend            Securities
of Shares        Name of Issuer (1)                        per Share (2)        Yield (3)           to Trust (2)
    ------------ -----------------------------------       ---------------      -----------             ------------
                Financial Services
<S>               <C>                                      <C>                        <C>           <C>
        136       Charles Schwab Corporation               $        44.000            0.13%         $    5,984.00
         73       Chase Manhattan Corporation                       81.875            2.00               5,976.88
        108       Citigroup, Inc.                                   55.500            1.01               5,994.00
         83       Fifth Third Bancorp                               71.250            1.35               5,913.75
        149       FleetBoston Corporation                           39.750            3.02               5,922.75
         43       J. P. Morgan & Company                           136.688            2.90               5,877.56
         70       Providian Financial Corporation                   84.563            0.24               5,919.38
         83       SunTrust Banks, Inc.                              71.375            1.93               5,924.13
                Health Care
         57       Allergan, Inc.                                   104.125            0.54               5,935.13
         78       Bristol-Myers Squibb Company                      74.938            1.15               5,845.13
        106       Guidant Corporation                               55.938            0.00               5,929.38
         57       Johnson & Johnson                                105.313            1.06               6,002.81
        105       Pharmacia & Upjohn, Inc.                          57.438            1.88               6,030.94
        109       Schering-Plough Corporation                       55.875            0.89               6,090.38
                Multi-Nationals
        106       Colgate-Palmolive Company                         56.625            1.11               6,002.25
         66       MCI WorldCom, Inc.                                88.125            0.00               5,816.25
         54       Procter & Gamble Company                         111.750            1.15               6,034.50
                Technology
         37       America Online, Inc.                             162.313            0.00               6,005.56
         68       Cisco Systems, Inc.                               87.438            0.00               5,945.75
         27       JDS Uniphase Corporation                         228.000            0.00               6,156.00
         67       Microsoft Corporation                             89.875            0.00               6,021.63
+        45       Nokia Oyj                                        130.625            0.34               5,878.13
         78       Oracle Corporation                                77.438            0.00               6,040.13
         62       Texas Instruments, Inc.                           99.063            0.17               6,141.88
         59       VERITAS Software Corporation                     103.125            0.00               6,084.38
    ------------                                                                                      ------------
      1,926                                                                                         $  149,472.68
    ============                                                                                      ============


</TABLE>


See "Notes to Portfolios".


Notes to Portfolios


(1)  The Securities are initially represented by "regular way" contracts for the
     performance of which an irrevocable letter of credit has been deposited
     with the Trustee. Contracts to acquire Securities were entered into on
     November 22, 1999 and have a settlement date of November 26, 1999 (see "The
     Trusts").


(2)  The market value of each Security is based on the last closing sale price
     on the applicable exchange or, if not listed, the last asked price on the
     business day before the Initial Date of Deposit. Other information
     regarding the Securities, as of the Initial Date of Deposit, is as follows:


                                                 Profit
                         Cost to                (Loss) To
                         Sponsor                 Sponsor
                     --------------          --------------
Series A             $   149,478             $      (5)
Series B             $   149,478             $      (5)


"+"  Indicates that the stock is held in the form of American Depositary
     Receipts or similar receipts.

(3)  Current Dividend Yield for each Security is based on the estimated annual
     dividends per share and the Security's market value as of the close of
     trading on the business day prior to the Initial Date of Deposit. Estimated
     annual dividends per share are calculated by annualizing the most recently
     declared dividends or by adding the most recent interim and final dividends
     declared and reflect any foreign withholding taxes.



   The Securities. A brief description of each of the issuers of the Securities
is listed below.


   Financial Services

   Charles Schwab Corporation. Charles Schwab Corporation provides a variety of
financial services to individual investors, independent investment managers,
retirement plans, and institutions. The company provides its services to
customers through multiple service channels, including the Internet, a network
of branch offices, telephone, and multilingual technologies.

   Chase Manhattan Corporation. Chase Manhattan Corporation is a bank holding
company that conducts domestic and international financial services through
various bank and non-bank subsidiaries. The company provides corporate finance,
wholesale banking, and investment services, as well as emphasizes originations,
underwriting, distribution, risk management products, and private banking.

   Citigroup, Inc. Citigroup, Inc. is a diversified financial services holding
company that provides a broad range of financial services to consumer and
corporate customers around the world. The company's services include investment
banking, retail brokerage, corporate banking, and cash management products and
services.

   Fifth Third Bancorp. Fifth Third Bancorp is the holding company for several
wholly owned subsidiaries, including The Fifth Third Bank. The banks conduct
business in Ohio, Florida, Kentucky, and Indiana. Fifth Third Bancorp offers
commercial banking, insurance, capital management and other financial services
to its clients.

   FleetBoston Corporation. FleetBoston Corporation provides a range of
financial services. The company provides commercial and consumer banking,
institutional and investment banking, cash management, trade
services, export finance, mortgage banking, corporate finance, asset-based
lending, and commercial real estate lending. Fleet Boston also provides
equipment leasing, credit cards, and other services.

   J.P. Morgan & Company, Inc. J.P. Morgan & Company, Inc. offers a variety of
financial services to businesses, governments, and individuals. The company
provides advice, raises capital, and trades financial instruments. J.P. Morgan
also manages investment assets for business enterprises, governments, financial
institutions, and private clients.

   Providian Financial Corporation. Providian Financial Corporation is a
diversified consumer lender. The company offers a variety of loan products,
including credit cards, revolving lines of credit, home loans, secured credit
cards, and fee-based products. Providian operates in the United States.

   SunTrust Banks, Inc. SunTrust Banks, Inc. is a super-regional bank holding
company. The company's subsidiary banks operate in Florida, Georgia, Alabama,
Maryland, Tennessee, Virginia, and the District of Columbia. SunTrust provides a
wide range of personal, corporate, and institutional financial services.

   Healthcare

   Allergan, Inc. Allergan, Inc. provides eye care and specialty pharmaceutical
products throughout the world. The company's products are marketed to the eye
care pharmaceutical, ophthalmic surgical device, over-the-counter contact lens
care, movement disorder, and dermatological markets. Allergan markets its
products underbrand names such as Alphagan, Botox, and Complete.

   Bristol-Myers Squibb Company. Bristol-Myers Squibb Company is a diversified
worldwide health and personal care company that manufactures medicines and other
products. The company's products include therapies for various diseases and
disorders, consumer medicines, orthopedic devices, ostomy care, wound
management, nutritional supplements, infant formulas, and hair and skin care
products.

   Guidant Corporation. Guidant Corporation designs, develops, manufactures, and
markets therapeutic medical devices for use in cardiac rhythm management,
vascular intervention, and cardiac and vascular surgery. The company's products
include automatic implantable cardioverter defibrillator systems, implantable
pacemaker systems, coronary stent systems, and balloon dilation catheters.

   Johnson & Johnson. Johnson & Johnson manufactures health care products and
provides related services. The company sells its products to the consumer,
pharmaceutical, and professional markets in countries around the world. Johnson
& Johnson's principal consumer products include BAND-AID adhesive bandages,
TYLENOL acetaminophen products, JOHNSON'S baby products, and STAYFREE sanitary
products, among others.

   Pharmacia & Upjohn, Inc. Pharmacia & Upjohn, Inc. is a global pharmaceutical
group that researches, develops, manufactures, and sells pharmaceutical and
healthcare products. The company provides prescription human pharmaceutical
products, nonprescription drugs, pharmaceutical chemicals, and pharmaceutical
products for food and companion animals. Pharmacia also provides products for
hospital care and diagnostics.

   Schering-Plough Corporation. Schering-Plough Corporation is a worldwide
pharmaceutical company that discovers and markets new therapies and treatment
programs. The company's core product groups include allergy/respiratory,
anti-infective/anticancer, dermatologicals, and cardiovasculars, as well as an
animal health business. Schering-Plough also conducts health management programs
and sells other consumer products.

   Multi-Nationals

   Colgate-Palmolive Company. Colgate-Palmolive Company is a consumer products
company that markets its products throughout the world. The company's products
include toothpaste, toothbrushes, shampoos, deodorants, bar and liquid soaps,
dishwashing liquid, and laundry products, among others. Colgate-Palmolive's
products are sold under brand names such as Colgate, Palmolive, Mennen, Ajax,
and Science Diet.

   MCI WorldCom, Inc. MCI WorldCom, Inc. provides consumers and businesses with
local, long distance, Internet, data, and international communications services.
The company's telecommunications products and services include switched and
dedicated long distance and local products, dedicated and dial-up Internet
access, wireless services, 800 services, calling cards, private lines, and debit
cards.

   Procter & Gamble Company. Procter & Gamble Company manufactures and markets
consumer products in countries throughout the world. The company provides
products in the laundry and cleaning, paper, beauty care, food and beverage, and
health care segments. Procter & Gamble's products include Pampers diapers, Tide
laundry detergent, PUR drinking water systems, Crest toothpaste, and Vicks
cough/cold products.

   Technology

   America Online, Inc. America Online, Inc. provides interactive communications
and services through its America Online and CompuServe worldwide Internet online
services. The company's Web sites offer such features as a personalized news
service, electronic mail via the Web, an online community center, public and
private meeting rooms and interactive conversations, and guest interviews.

   Cisco Systems, Inc. Cisco Systems, Inc. supplies data networking products to
the corporate enterprise and public wide area service provider markets. The
company offers a variety of products including routers, LAN switches, frame
relay/ATM, and remote access concentrators. Cisco's clients include utilities,
corporations, universities, governments, and small to medium-size businesses
worldwide.


   JDS Uniphase Corporation. JDS Uniphase Corporation provides advanced
fiberoptic components and modules. The company's products are sold to
telecommunications and cable television system providers worldwide. Products
include semiconductor lasers, high-speed external modulators, transmitters,
amplifiers, couplers, multiplexers, and optical switches. JDS also designs,
manufactures, and markets laser subsystems.

   Microsoft Corporation. Microsoft Corporation develops, manufactures,
licenses, sells, and supports software products. The company offers operating
system software, server application software, business and consumer applications
software, software development tools, and Internet and intranet software.
Microsoft also develops the MSN network of Internet products and services.

   Nokia Oyj. Nokia Oyj is an international telecommunications company. The
company develops and manufactures mobile phones, networks and systems for
cellular and fixed networks. Nokia also develops and supplies access networks,
multimedia equipment and other telecom related products. The company provides
its products and services worldwide.

   Oracle Corporation. Oracle Corporation supplies software for enterprise
information management. The company offers databases and relational servers,
application development and decision support tools, and enterprise business
applications. Oracle's software runs on network computers, personal digital
assistants, set-top devices, work-stations, PCs, minicomputers, mainframes, and
massively parallel computers.

   Texas Instruments, Inc. Texas Instruments, Inc. provides semiconductor
products, as well as designs and supplies digital signal processing and analog
technologies. The company also conducts businesses in materials and controls,
educational and productivity solutions, and digital imaging. Texas Instruments
has manufacturing or sales operations in countries around the world.

   VERITAS Software Corporation. VERITAS Software Corporation designs, develops,
and markets enterprise storage management and high availability products that
manage both on-line and off-line data for business- critical computing systems.
The company's products are marketed to original equipment manufacturers and
end-user customers through resellers, value added resellers, hardware
distributors, and systems integrators.




               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS


To the Board of Directors of Van Kampen Funds Inc. and the Unitholders of Van
Kampen Focus Portfolios, Series 189:

   We have audited the accompanying statements of condition and the related
portfolios of Van Kampen Focus Portfolios, Series 189 as of November 23, 1999.
The statements of condition and portfolios are the responsibility of the
Sponsor. Our responsibility is to express an opinion on such financial
statements based on our audit.


   We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation of an irrevocable letter of credit deposited to purchase securities
by correspondence with the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the Sponsor, as
well as evaluating the overall financial statement presentation.


   We believe our audit provides a reasonable basis for our opinion. In our
opinion, the financial statements referred to above present fairly, in all
material respects, the financial position of Van Kampen Focus Portfolios, Series
189 as of November 23, 1999, in conformity with generally accepted accounting
principles.

                                                              GRANT THORNTON LLP
Chicago, Illinois
November 23, 1999


<TABLE>
<CAPTION>


                             STATEMENTS OF CONDITION
                             As of November 23, 1999

                                                                                             Series A        Series B
                                                                                               Trust           Trust
                                                                                          --------------- --------------
INVESTMENT IN SECURITIES
<S>                                                                                     <C>               <C>
Contracts to purchase Securities (1)                                                    $       149,473   $      149,473
                                                                                          --------------- --------------
  Total                                                                                 $       149,473   $      149,473
                                                                                          =============== ==============


LIABILITIES AND INTEREST OF UNITHOLDERS
Liabilities--
  Organizational costs (2)                                                              $           179   $          168
  Deferred sales charge liability (3)                                                             2,944            5,284
Interest of Unitholders--
  Cost to investors (4)                                                                         150,980          150,980
  Less: Gross underwriting commission and organizational costs (2)(4)(5)                          4,630            6,959
                                                                                          --------------- --------------
Net interest to Unitholders (4)                                                                 146,350          144,021
                                                                                          --------------- --------------
Total                                                                                   $       149,473   $      149,473
                                                                                          =============== ==============


</TABLE>

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

(1)  The value of the Securities is determined by Interactive Data Corporation
     on the bases set forth under "Public Offering--Offering Price". The
     contracts to purchase Securities are collateralized by an irrevocable
     letter of credit which has been deposited with the Trustee.

(2)  A portion of the Public Offering Price represents an amount sufficient to
     pay for all or a portion of the costs incurred in establishing each Trust.
     The amount of these costs are set forth in the "Fee Table". A distribution
     will be made as of the close of the initial offering period to an account
     maintained by the Trustee from which this obligation of the investors will
     be satisfied.

(3)  Represents the amount of mandatory distributions from each Trust on the
     bases set forth under "Public Offering".

(4)  The aggregate public offering price and the aggregate sales charge are
     computed on the bases set forth under "Public Offering--Offering Price".

(5)  Assumes the maximum sales charge.




THE TRUSTS
- --------------------------------------------------------------------------------

   The Trusts were created under the laws of the State of New York pursuant to a
Trust Indenture and Trust Agreement (the "Trust Agreement"), dated the date of
this Prospectus (the "Initial Date of Deposit"), among Van Kampen Funds Inc., as
Sponsor, Van Kampen Investment Advisory Corp., as Supervisor, The Bank of New
York, as Trustee, and American Portfolio Evaluation Services, a division of Van
Kampen Investment Advisory Corp., as Evaluator.
   The Trusts offer investors the opportunity to purchase Units representing
proportionate interests in portfolios of actively traded equity securities. A
Trust may be an appropriate medium for investors who desire to participate in a
portfolio of common stocks with greater diversification than they might be able
to acquire individually.
   On the Initial Date of Deposit, the Sponsor deposited delivery statements
relating to contracts for the purchase of the Securities and an irrevocable
letter of credit in the amount required for these purchases with the Trustee. In
exchange for these contracts the Trustee delivered to the Sponsor documentation
evidencing the ownership of Units of the Trusts. Unless otherwise terminated as
provided in the Trust Agreement, the Trusts will terminate on the Mandatory
Termination Date and any remaining Securities will be liquidated or distributed
by the Trustee within a reasonable time. As used in this Prospectus the term
"Securities" means the securities (including contracts to purchase these
securities) listed in "Portfolio" for each Trust and any additional securities
deposited into each Trust.
   Additional Units of a Trust may be issued at any time by depositing in the
Trust (i) additional Securities, (ii) contracts to purchase Securities together
with cash or irrevocable letters of credit or (iii) cash (or a letter of credit)
with instructions to purchase additional Securities. As additional Units are
issued by a Trust, the aggregate value of the Securities will be increased and
the fractional undivided interest represented by each Unit will be decreased.
The Sponsor may continue to make additional deposits into a Trust following the
Initial Date of Deposit provided that the additional deposits will be in amounts
which will maintain, as nearly as practicable, the same percentage relationship
among the number of shares of each Security in the Trustportfolio that existed
immediately prior to the subsequent deposit. Investors may experience a dilution
of their investments and a reduction in their anticipated income because of
fluctuations in the prices of the Securities between the time of the deposit and
the purchase of the Securities and because the Trusts will pay the associated
brokerage or acquisition fees.
   Each Unit of a Trust initially offered represents an undivided interest in
that Trust. To the extent that any Units are redeemed by the Trustee or
additional Units are issued as a result of additional Securities being deposited
by the Sponsor, the fractional undivided interest in that Trust represented by
each unredeemed Unit will increase or decrease accordingly, although the actual
interest in the Trust will remain unchanged. Units will remain outstanding until
redeemed upon tender to the Trustee by Unitholders, which may include the
Sponsor, or until the termination of the Trust Agreement.
   Each Trust consists of (a) the Securities (including contracts for the
purchase thereof) listed under the applicable "Portfolio" as may continue to be
held from time to time in the Trust, (b) any additional Securities acquired and
held by the Trust pursuant to the provisions of the Trust Agreement and (c) any
cash held in the related Income and Capital Accounts. Neither the Sponsor nor
the Trustee shall be liable in any way for any failure in any of the Securities.

OBJECTIVES AND SECURITIES SELECTION
- --------------------------------------------------------------------------------

   The objective of each Trust is to provide capital appreciation by investing
in a portfolio of actively traded equity securities selected by the Sponsor
based on concepts outlined in The Roaring 2000s written by Harry S. Dent, Jr.
There is no assurance that each Trust will achieve its objective. The Trust
selection criteria is described in "The Roaring 2000sSM Trusts".

   Harry S. Dent, Jr. has not participated in any way in the creation of the
Trusts or in the selection of stocks included in the Trusts and has not approved
any information herein relating thereto.

   The Sponsor selected each portfolio based on concepts presented in The
Roaring 2000s and research compiled by Mr. Dent. Mr. Dent did not select the
stocks for the portfolios, does not endorse the Trusts and will not supervise
the portfolios. The opinions and forecasts of Mr. Dent expressed in his books
and elsewhere are not necessarily those of Van Kampen Funds Inc. and may not
actually come to pass. Mr. Dent is being compensated by the Sponsor for his
research. The Roaring 2000sSM is the exclusive property of The H.S. Dent
Foundation. The Roaring 2000sSM is a service mark of the H.S. Dent Foundation.
Each Trust has licensed the use of this service mark from the H.S. Dent
Foundation.

   You should note that we applied the selection criteria to the Securities for
inclusion in the Trusts as of the Initial Date of Deposit. After this date, the
Securities may no longer meet the selection criteria. Should a Security no
longer meet the selection criteria, we will generally not remove the Security
from its Trust portfolio.

   A balanced investment portfolio incorporates various style and capitalization
characteristics. We offer unit trusts with a variety of styles and
capitalizations to meet your needs. We determine style characteristics (growth
or value) based on the criteria used in selecting your Trust portfolio.
Generally, a growth portfolio includes companies in a growth phase of their
business with increasing earnings. A value portfolio generally includes
companies with low relative price-earnings ratios that we believe are
undervalued. We determine market capitalizations as follows based on the
weighted median market capitalization of a portfolio: Small-Cap-- less than $1
billion; Mid-Cap-- $1 billion to $5 billion; and Large-Cap-- over $5 billion. We
determine all style and capitalization characteristics as of the Initial Date of
Deposit and the characteristics may vary thereafter. We will not remove a
Security from a Trust as a result of any change in characteristics.

RISK FACTORS
- --------------------------------------------------------------------------------

   Price Volatility. The Trusts invest in common stocks of U.S. and foreign
companies. The value of Units will fluctuate with the value of these stocks and
may be more or less than the price you originally paid for your Units. The
market value of common stocks sometimes moves up or down rapidly and
unpredictably. Because the Trusts are unmanaged, the Trustee will not sell
stocks in response to market fluctuations as is common in managed investments.
In addition, because some Trusts hold a relatively small number of stocks, you
may encounter greater market risk than in a more diversified investment. As with
any investment, we cannot guarantee that the performance of a Trust will be
positive over any period of time.
   Dividends. Common stocks represent ownership interests in the issuers and are
not obligations of the issuers. Accordingly, common stockholders have a right to
receive dividends only after the company has provided for payment of its
creditors, bondholders and preferred stockholders. Common stocks do not assure
dividend payments. Dividends are paid only when declared by an issuer's board of
directors and the amount of any dividend may vary over time.
   Financial Services Industry. Each Trust invests significantly in banks and
thrifts, insurance companies and investment firms. Banks, thrifts and their
holding companies are especially subject to the adverse effects of economic
recession; volatile interest rates; portfolio concentrations in geographic
markets and in commercial and residential real estate loans; and competition
from new entrants in their fields of business. In addition, banks, thrifts and
their holding companies are extensively regulated at both the federal and state
level and may be adversely affected by increased regulations.
   Banks and thrifts will face increased competition from nontraditional lending
sources as regulatory changes permit new entrants to offer various financial
products. Technological advances such as the Internet allow these nontraditional
lending sources to cut overhead and permit the more efficient use of customer
data. Banks are already facing tremendous pressure from mutual funds, brokerage
firms and other financial service providers in the competition to furnish
services that were traditionally offered by banks.
   Brokerage firms, broker/dealers, investment banks, finance companies and
mutual fund companies compete with banks and thrifts to provide traditional
financial service products, in addition to their traditional services, such as
brokerage and investment advice. In addition, all financial service companies
face shrinking profit margins due to new competitors, the cost of new technology
and the pressure to compete globally.
   Companies involved in the insurance industry underwrite, sell or distribute
property and casualty, life or health insurance. Many factors affect insurance
company profits, including interest rate movements, the imposition of premium
rate caps, competition and pressure to compete globally. Property and casualty
insurance profits may also be affected by weather catastrophes and other
disasters. Life and health insurance profits may be affected by mortality rates.
Already extensively regulated, insurance companies' profits may also be
adversely affected by increased government regulations or tax law changes.
   Technology Issuers. Each Trust invests significantly in technology companies.
These companies face risks related to rapidly changing technology, rapid product
obsolescence, cyclical market patterns, evolving industry standards and frequent
new product introductions. An unexpected change in technology can have a
significant negative impact on a company. The failure of a company to introduce
new products or technologies or keep pace with rapidly changing technology, can
have a negative impact on the company's results. Technology stocks tend to
experience substantial price volatility and speculative trading. Announcements
about new products, technologies, operating results or marketing alliances can
cause stock prices to fluctuate dramatically. At times, however, extreme price
and volume fluctuations are unrelated to the operating performance of a company.
This can impact your ability to redeem your Units at a price equal to or greater
than what you paid.
   The market for certain products may have only recently begun to develop, is
rapidly evolving or is characterized by increasing suppliers. Key components of
some technology products are available only from limited sources. This can
impact the cost of and ability to acquire these components. Some technology
companies serve highly concentrated customer bases with a limited number of
large customers. Any failure to meet the standard of these customers can result
in a significant loss or reduction in sales. Many products and technologies are
incorporated into other products. As a result, some companies are highly
dependent on the performance of other technology companies. We cannot guarantee
that these customers will continue to place additional orders or will place
orders in similar quantities as in the past.
   Health Care Issuers. Each Trust invests significantly in health care
companies. These issuers include companies involved in advanced medical devices
and instruments, drugs and biotechnology, managed care, hospital
management/health services and medical supplies. These companies face
substantial government regulation and approval procedures. Congress and the
president have proposed a variety of legislative changes concerning health care
issuers from time to time. Government regulation, and any change in regulation,
can have a significantly unfavorable effect on the price and availability of
products and services.
   Drug and medical products companies also face the risk of increasing
competition from new products or services, generic drug sales, termination of
patent protection for drug or medical supply products and the risk that a
product will never come to market. The research and development costs of
bringing a new drug or medical product to market are substantial. This process
involves lengthy government review with no guarantee of approval. These
companies may have losses and may not offer proposed products for several years,
if at all. The failure to gain approval for a new drug or product can have a
substantial negative impact on a company and its stock.
   Health care facility operators face risks related to demand for services, the
ability of the facility to provide required services, confidence in the
facility, management capabilities, competition, efforts by insurers and
government agencies to limit rates, expenses, the cost and possible
unavailability of malpractice insurance, and termination or restriction of
government financial assistance (such as Medicare, Medicaid or similar
programs).
   No FDIC Guarantee. An investment in your Trust is not a deposit of any bank
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or
any other government agency.
   Year 2000 Readiness Disclosure. These two paragraphs constitute "Year 2000
Readiness Disclosure" within the meaning of the Year 2000 Information and
Readiness Disclosure Act of 1998. If computer systems used by the Sponsor,
Evaluator, Supervisor, Trustee or other service providers to the Trusts do not
properly process date-related information after December 31, 1999, the resulting
difficulties could adversely impact the Trusts. This is commonly known as the
"Year 2000 Problem." The Sponsor, Evaluator, Supervisor and Trustee are taking
steps to address this problem and to obtain reasonable assurances that other
service providers to the Trusts are taking comparable steps. We cannot guarantee
that these steps will be sufficient to avoid any adverse impact on the Trusts.
This problem may impact corporations to varying degrees based on factors such as
industry sector and degree of technological sophistication. We cannot predict
what impact, if any, this problem will have on the issuers of the Securities.
   In addition, computer failures throughout the financial services industry
beginning January 1, 2000 could have a detrimental effect on the markets for the
Securities. Improperly functioning trading systems may result in settlement
problems and liquidity issues. Moreover, corporate and governmental data
processing errors may adversely affect issuers and overall economic
uncertainties. Remediation costs will affect the earnings of individual issuers.
These costs could be substantial. Issuers may report these costs inconsistently
in U.S. and foreign financial markets. All of these issues could adversely
affect the Securities and the Trusts.

PUBLIC OFFERING
- --------------------------------------------------------------------------------


   General. Units are offered at the Public Offering Price which includes the
underlying value of the Securities, the initial sales charge, and cash, if any,
in the Income and Capital Accounts. The "Fee Table" describes the sales charges
in detail. If any deferred sales charge payment date is not a business day, we
will charge the payment on the next business day. If you purchase Units after
the initial deferred sales charge payment, you will only pay that portion of the
payments not yet collected. A portion of the Public Offering Price includes an
amount of Securities to pay for all or a portion of the costs incurred in
establishing your Trust, including the cost of preparing documents relating to
the Trust (such as the prospectus, trust agreement and closing documents,
federal and state registration fees, the initial fees and expenses of the
Trustee and legal and audit expenses). Beginning on November 23, 2000, the
secondary market sales charge for the Series B Trust will be 4.00% and will not
include deferred payments. The sales charge for the Series B Trust will reduce
by 0.5% on each subsequent November 23 to a minimum of 3.00%. The initial
offering period sales charge is reduced as follows:


       Transaction         Series A           Series B
         Amount*         Sales Charge       Sales Charge
     --------------     --------------     --------------
$50,000 - $99,999             2.70%            4.25%
$100,000 - $249,999           2.50             4.00
$250,000 - $499,999           2.25             3.50
$500,000 - $999,999           2.00             2.50
$1,000,000 or more            1.50             1.50

- ---------------
*The breakpoint sales charges are also applied on a Unit basis utilizing a
breakpoint equivalent in the above table of $10 per Unit and will be applied on
whichever basis is more favorable to the investor.

   Any sales charge reduction is the responsibility of the selling broker,
dealer or agent. An investor may aggregate purchases of Units of the Trusts for
purposes of qualifying for volume purchase discounts listed above. The reduced
sales charge structure will also apply on all purchases by the same person from
any one dealer of units of Van Kampen-sponsored unit investment trusts which are
being offered in the initial offering period (a) on any one day (the "Initial
Purchase Date") or (b) on any day subsequent to the Initial Purchase Date if the
units purchased are of a unit investment trust purchased on the Initial Purchase
Date. In the event units of more than one trust are purchased on the Initial
Purchase Date, the aggregate dollar amount of such purchases will be used to
determine whether purchasers are eligible for a reduced sales charge. Such
aggregate dollar amount will be divided by the public offering price per unit of
each respective trust purchased to determine the total number of units which
such amount could have purchased of each individual trust. Purchasers must then
consult the applicable trust's prospectus to determine whether the total number
of units which could have been purchased of a specific trust would have
qualified for a reduced sales charge and the amount of such reduction. To
determine the applicable sales charge reduction it is necessary to accumulate
all purchases made on the Initial Purchase Date and all purchases made in
accordance with (b) above. Units purchased in the name of the spouse of a
purchaser or in the name of a child of such purchaser ("immediate family
members") will be deemed to be additional purchases by the purchaser for the
purposes of calculating the applicable sales charge. The reduced sales charges
will also be applicable to a trustee or other fiduciary purchasing securities
for one or more trust estate or fiduciary accounts. If you purchase Units on
more than one day to achieve the discounts described in this paragraph, the
discount allowed on any single day will apply only to Units purchased on that
day (a retroactive discount is not given on all prior purchases).
   A portion of the sales charge is waived for certain accounts described in
this paragraph. Purchases by these accounts are subject only to the portion of
the deferred sales charge that is retained by the Sponsor. Please refer to the
section called "Wrap Fee and Advisory Accounts" for additional information on
these purchases. Units may be purchased in the primary or secondary market at
the Public Offering Price less the concession the Sponsor typically allows to
brokers and dealers for purchases by (1) investors who purchase Units through
registered investment advisers, certified financial planners and registered
broker-dealers who in each case either charge periodic fees for financial
planning, investment advisory or asset management service, or provide such
services in connection with the establishment of an investment account for which
a comprehensive "wrap fee" charge is imposed, (2) bank trust departments
investing funds over which they exercise exclusive discretionary investment
authority and that are held in a fiduciary, agency, custodial or similar
capacity, (3) any person who for at least 90 days, has been an officer, director
or bona fide employee of any firm offering Units for sale to investors or their
immediate family members (as described above) and (4) officers and directors of
bank holding companies that make Units available directly or through
subsidiaries or bank affiliates. Notwithstanding anything to the contrary in
this Prospectus, such investors, bank trust departments, firm employees and bank
holding company officers and directors who purchase Units through this program
will not receive sales charge reductions for quantity purchases.
   During the initial offering period of the Trusts offered in this prospectus,
unitholders of any other Van Kampen-sponsored unit investment trusts may utilize
their redemption or termination proceeds to purchase Units of the Trusts offered
in this prospectus at the Public Offering Price per Unit less 1%.
   Employees, officers and directors (including their spouses, children,
grandchildren, parents, grandparents, siblings, mothers-in-law, fathers-in-law,
sons-in-law, daughters-in-law, and trustees, custodians or fiduciaries for the
benefit of such persons) of the Van Kampen Funds Inc. and its affiliates,
dealers and their affiliates and vendors providing services to the Sponsor may
purchase Units at the Public Offering Price less the applicable dealer
concession.
   The minimum purchase is 100 Units (25 Units for retirement accounts) but may
vary by selling firm. However, in connection with fully disclosed transactions
with the Sponsor, the minimum purchase requirement will be that number of Units
set forth in the contract between the Sponsor and the related broker or agent.
   Offering Price. The Public Offering Price of Units will vary from the amounts
stated under "Summary of Essential Financial Information" in accordance with
fluctuations in the prices of the underlying Securities in the Trusts. The
initial price of the Securities was determined by Interactive Data Corporation,
a firm regularly engaged in the business of evaluating, quoting or appraising
comparable securities. The Evaluator will generally determine the value of the
Securities as of the Evaluation Time on each business day and will adjust the
Public Offering Price of Units accordingly. This Public Offering Price will be
effective for all orders received prior to the Evaluation Time on each business
day. The Evaluation Time is the close of the New York Stock Exchange on each
Trust business day. Orders received by the Trustee or Sponsor for purchases,
sales or redemptions after that time, or on a day which is not a business day,
will be held until the next determination of price. The term "business day", as
used herein and under "Rights of Unitholders--Redemption of Units", excludes
Saturdays, Sundays and holidays observed by the New York Stock Exchange. The
term "business day" also excludes any day on which more than 33% of the
Securities are not traded on their principal trading exchange due to a customary
business holiday on that exchange.
   The aggregate underlying value of the Securities during the initial offering
period is determined on each business day by the Evaluator in the following
manner: If the Securities are listed on a national or foreign securities
exchange, this evaluation is generally based on the closing sale prices on that
exchange (unless it is determined that these prices are inappropriate as a basis
for valuation) or, if there is no closing sale price on that exchange, at the
closing ask prices. If the Securities are not listed on a national or foreign
securities exchange or, if so listed and the principal market therefor is other
than on the exchange, the evaluation shall generally be based on the current ask
price on the over-the-counter market (unless it is determined that these prices
are inappropriate as a basis for evaluation). If current ask prices are
unavailable, the evaluation is generally determined (a) on the basis of current
ask prices for comparable securities, (b) by appraising the value of the
Securities on the ask side of the market or (c) by any combination of the above.
The value of any foreign securities is based on the applicable currency exchange
rate as of the Evaluation Time. The value of the Securities for purposes of
secondary market transactions and redemptions is described under "Rights of
Unitholders--Redemption of Units".
   In offering the Units to the public, neither the Sponsor nor any
broker-dealers are recommending any of the individual Securities but rather the
entire pool of Securities in a Trust, taken as a whole, which are represented by
the Units.
   Unit Distribution. Units will be distributed to the public by the Sponsor,
broker-dealers and others at the Public Offering Price. Units repurchased in the
secondary market, if any, may be offered by this Prospectus at the secondary
market Public Offering Price in the manner described above.
   The Sponsor intends to qualify Units for sale in a number of states. Brokers,
dealers and others will be allowed a concession or agency commission in
connection with the distribution of Units during the initial offering period as
described below.

       Transaction         Series A           Series B
         Amount*          Concession         Concession
     --------------     --------------     --------------
Less than $50,000             2.25%            3.50%
$50,000 - $99,999             2.00             3.25
$100,000 - $249,999           1.75             3.00
$250,000 - $499,999           1.50             2.50
$500,000 - $999,999           1.25             1.50
$1,000,000 or more            0.75             0.75

- ---------------
 *The breakpoint concessions or agency commissions are also applied on a Unit
basis using a breakpoint equivalent of $10 per Unit and are applied on whichever
basis is more favorable to the distributor.

   In addition to the amounts set forth above, during the initial offering
period any firm that distributes 500,000-999,999 Units will receive additional
compensation of $.005 per Unit; any firm that distributes 1,000,000-1,999,999
Units will receive $.01 per Unit; any firm that distributes 2,000,000-2,999,999
Units will receive $.015 per Unit; and any firm that distributes 3,000,000 Units
or more will receive $.02 per Unit. A firm may aggregate Units of the Series A
Trust and the Series B Trust to qualify for these compensation levels. This
additional compensation will be paid by the Sponsor out of its own assets at the
end of the initial offering period.
   Any discount provided to investors will be borne by the selling dealer or
agent as indicated under "General" above. For transactions involving unitholders
of other Van Kampen unit investment trusts who use their redemption or
termination proceeds to purchase Units of the Trusts, the total concession or
agency commission will amount to 1.30% per Unit for the Series A Trust and 2.50%
per Unit for the Series B Trust. For all secondary market transactions the total
concession or agency commission will amount to 70% of the sales charge.
Notwithstanding anything to the contrary herein, in no case shall the total of
any concessions, agency commissions and any additional compensation allowed or
paid to any broker, dealer or other distributor of Units with respect to any
individual transaction exceed the total sales charge applicable to such
transaction. The Sponsor reserves the right to reject, in whole or in part, any
order for the purchase of Units and to change the amount of the concession or
agency commission to dealers and others up to the entire amount of the sales
charge.
   Broker-dealers of the Trusts, banks and/or others may be eligible to
participate in a program in which such firms receive from the Sponsor a nominal
award for each of their representatives who have sold a minimum number of units
of unit investment trusts created by the Sponsor during a specified time period.
In addition, at various times the Sponsor may implement other programs under
which the sales forces of brokers, dealers, banks and/or others may be eligible
to win other nominal awards for certain sales efforts, or under which the
Sponsor will reallow to such brokers, dealers, banks and/or others that sponsor
sales contests or recognition programs conforming to criteria established by the
Sponsor, or participate in sales programs sponsored by the Sponsor, an amount
not exceeding the total applicable sales charges on the sales generated by such
persons at the public offering price during such programs. Also, the Sponsor in
its discretion may from time to time pursuant to objective criteria established
by the Sponsor pay fees to qualifying entities for certain services or
activities which are primarily intended to result in sales of Units of the
Trusts. Such payments are made by the Sponsor out of its own assets, and not out
of the assets of any Trust. These programs will not change the price Unitholders
pay for their Units or the amount that a Trust will receive from the Units sold.
   Sponsor and Other Compensation. The Sponsor will receive a gross sales
commission equal to the total sales charge applicable to each transaction.
Prudential Securities, Inc. will receive an additional concession equal to 0.15%
of the Public Offering Price of all Units it distributes during the initial
offering period. Any sales charge discount provided to investors will be borne
by the selling dealer or agent. In addition, the Sponsor will realize a profit
or loss as a result of the difference between the price paid for the Securities
by the Sponsor and the cost of the Securities to each Trust on the Initial Date
of Deposit as well as on subsequent deposits. See "Notes to Portfolios". The
Sponsor has not participated as sole underwriter or as manager or as a member of
the underwriting syndicates or as an agent in a private placement for any of the
Securities. The Sponsor may realize profit or loss as a result of the possible
fluctuations in the market value of the Securities, since all proceeds received
from purchasers of Units are retained by the Sponsor. In maintaining a secondary
market, the Sponsor will realize profits or losses in the amount of any
difference between the price at which Units are purchased and the price at which
Units are resold (which price includes the applicable sales charge) or from a
redemption of repurchased Units at a price above or below the purchase price.
Cash, if any, made available to the Sponsor prior to the date of settlement for
the purchase of Units may be used in the Sponsor's business and may be deemed to
be a benefit to the Sponsor, subject to the limitations of the Securities
Exchange Act of 1934.
   An affiliate of the Sponsor may have participated in a public offering of one
or more of the Securities. The Sponsor, an affiliate or their employees may have
a long or short position in these Securities or related securities. An affiliate
may act as a specialist or market maker for these Securities. An officer,
director or employee of the Sponsor or an affiliate may be an officer or
director for issuers of the Securities.
   Market for Units. Although it is not obligated to do so, the Sponsor
currently intends to maintain a market for Units and to purchase Units at the
secondary market repurchase price (which is described under "Right of
Unitholders--Redemption of Units"). The Sponsor may discontinue purchases of
Units or discontinue purchases at this price at any time. In the event that a
secondary market is not maintained, a Unitholder will be able to dispose of
Units by tendering them to the Trustee for redemption at the Redemption Price.
See "Rights of Unitholders--Redemption of Units". Unitholders should contact
their broker to determine the best price for Units in the secondary market.
Units sold prior to the time the entire deferred sales charge has been collected
will be assessed the amount of any remaining deferred sales charge at the time
of sale. The Trustee will notify the Sponsor of any tendered of Units for
redemption. If the Sponsor's bid in the secondary market equals or exceeds the
Redemption Price per Unit, it may purchase the Units not later than the day on
which Units would have been redeemed by the Trustee. The Sponsor may sell
repurchased Units at the secondary market Public Offering Price per Unit.

RETIREMENT ACCOUNTS
- --------------------------------------------------------------------------------

   Units are available for purchase in connection with certain types of
tax-sheltered retirement plans, including Individual Retirement Accounts for the
individuals, Simplified Employee Pension Plans for employees, qualified plans
for self-employed individuals, and qualified corporate pension and profit
sharing plans for employees. The minimum purchase for these accounts is reduced
to 25 Units but may vary by selling firm. The purchase of Units may be limited
by the plans' provisions and does not itself establish such plans.

WRAP FEE AND ADVISORY ACCOUNTS
- --------------------------------------------------------------------------------

   Units may be available for purchase in connection with "wrap fee" accounts
and other similar accounts. You should consult your financial professional to
determine whether you can benefit from these accounts. For these purchases you
generally only pay the portion of the sales charge that is retained by your
Trust's Sponsor, Van Kampen Funds Inc. This table illustrates the transaction
fees you will pay as a percentage of the public offering price per Unit.

                              Series A          Series B
                                Trust             Trust
                              ---------         ---------
Fee paid on purchase            0.00%            0.00%
Deferred sponsor retention      0.70             1.00
                              ---------         ---------
    Total                       0.70%            1.00%
                              =========         =========

   You should consult the "Public Offering--General" section for specific
information on this and other sales charge discounts.

RIGHTS OF UNITHOLDERS
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   Distributions. Dividends and any net proceeds from the sale of Securities
received by a Trust will generally be distributed to Unitholders on each
Distribution Date to Unitholders of record on the preceding Record Date. These
dates are listed under "Summary of Essential Financial Information". A person
becomes a Unitholder of record on the date of settlement (generally three
business days after Units are ordered). Unitholders may elect to receive
distributions in cash or to have distributions reinvested into additional Units.
Distributions may also be reinvested into Van Kampen mutual funds. See "Rights
of Unitholders--Reinvestment Option".
   Dividends received by a Trust are credited to the Income Account of the
Trust. Other receipts (e.g., capital gains, proceeds from the sale of
Securities, etc.) are credited to the Capital Account. Proceeds received on the
sale of any Securities, to the extent not used to meet redemptions of Units or
pay deferred sales charges, fees or expenses, will be distributed to
Unitholders. Proceeds received from the disposition of any Securities after a
record date and prior to the following distribution date will be held in the
Capital Account and not distributed until the next distribution date. Any
distribution to Unitholders consists of each Unitholder's pro rate share of the
available cash in the Income and Capital Accounts as of the related Record Date.
   Reinvestment Option. Unitholders may have distributions automatically
reinvested in additional Units under the Automatic Reinvestment Option (to the
extent Units may be lawfully offered for sale in the state in which the
Unitholder resides) through two options, if available. Brokers and dealers can
use the Dividend Reinvestment Service through Depository Trust Company or
purchase the Automatic Reinvestment Option CUSIP, if available. Unitholders will
be subject to the remaining deferred sales charge payments due on Units. To
participate in this reinvestment option, a Unitholder must file with the Trustee
a written notice of election, together with any certificate representing Units
and other documentation that the Trustee may then require, at least five days
prior to the related Record Date. A Unitholder's election will apply to all
Units owned by the Unitholder and will remain in effect until changed by the
Unitholder. If Units are unavailable for reinvestment, distributions will be
paid in cash. Purchases of additional Units made pursuant to the reinvestment
plan will be made at the net asset value for Units as of the Evaluation Time on
the Distribution Date.
   In addition, under the Guaranteed Reinvestment Option Unitholders may elect
to have distributions automatically reinvested in certain Van Kampen mutual
funds (the "Reinvestment Funds"). Each Reinvestment Fund has investment
objectives which differ from those of the Trusts. The prospectus relating to
each Reinvestment Fund describes its investment policies and how to begin
reinvestment. A Unitholder may obtain a prospectus for the Reinvestment Funds
from the Sponsor. Purchases of shares of a Reinvestment Fund will be made at a
net asset value computed on the Distribution Date. Unitholders with an existing
Guaranteed Reinvestment Option account (whereby a sales charge is imposed on
distribution reinvestments) may transfer their existing account into a new
account which allows purchases of Reinvestment Fund shares at net asset value.
   A participant may elect to terminate his or her reinvestment plan and receive
future distributions in cash by notifying the Trustee in writing no later than
five days before a distribution date. The Sponsor, each Reinvestment Fund, and
its investment adviser shall have the right to suspend or terminate these
reinvestment plans at any time.
   Redemption of Units. A Unitholder may redeem all or a portion of his Units by
tender to the Trustee at its Unit Investment Trust Division, 101 Barclay Street,
20th Floor, New York, New York 10286. Certificates must be tendered to the
Trustee, duly endorsed or accompanied by proper instruments of transfer with
signature guaranteed (or by providing satisfactory indemnity in connection with
lost, stolen or destroyed certificates) and by payment of applicable
governmental charges, if any. On the seventh day following the tender, the
Unitholder will be entitled to receive in cash an amount for each Unit equal to
the Redemption Price per Unit next computed on the date of tender. The "date of
tender" is deemed to be the date on which Units are received by the Trustee,
except that with respect to Units received by the Trustee after the Evaluation
Time or on a day which is not a Trust business day, the date of tender is deemed
to be the next business day.
   Unitholders tendering 1,000 or more Units of a Trust for redemption may
request an in kind distribution of Securities equal to the Redemption Price per
Unit on the date of tender. Trusts generally do not offer in kind distributions
of portfolio securities that are held in foreign markets. An in kind
distribution will be made by the Trustee through the distribution of each of the
Securities in book-entry form to the account of the Unitholder's broker-dealer
at Depository Trust Company. Amounts representing fractional shares will be
distributed in cash. The Trustee may adjust the number of shares of any Security
included in a Unitholder's in kind distribution to facilitate the distribution
of whole shares.
   The Trustee may sell Securities to satisfy Unit redemptions. To the extent
that Securities are redeemed in kind or sold, the size of a Trust will be, and
the diversity of a Trust may be, reduced. Sales may be required at a time when
Securities would not otherwise be sold and may result in lower prices than might
otherwise be realized. The price received upon redemption may be more or less
than the amount paid by the Unitholder depending on the value of the Securities
at the time of redemption. Special federal income tax consequences will result
if a Unitholder requests an in kind distribution. See "Taxation".
   The Redemption Price per Unit and the secondary market repurchase price per
Unit are equal to the pro rate share of each Unit in each Trust determined on
the basis of (i) the cash on hand in the Trust, (ii) the value of the Securities
in the Trust and (iii) dividends receivable on the Securities in the Trust
trading ex-dividend as of the date of computation, less (a) amounts representing
taxes or other governmental charges payable out of the Trust, (b) the accrued
expenses of the Trust and (c) any unpaid deferred sales charge payments. During
the initial offering period, the redemption price and the secondary market
repurchase price will also include estimated organizational costs. For these
purposes, the Evaluator may determine the value of the Securities in the
following manner: If the Securities are listed on a national or foreign
securities exchange, this evaluation is generally based on the closing sale
prices on that exchange (unless it is determined that these prices are
inappropriate as a basis for valuation) or, if there is no closing sale price on
that exchange, at the closing bid prices. If the Securities are not so listed
or, if so listed and the principal market therefore is other than on the
exchange, the evaluation may be based on the current bid price on the
over-the-counter market. If current bid prices are unavailable or inappropriate,
the evaluation may be determined (a) on the basis of current bid prices for
comparable securities, (b) by appraising the Securities on the bid side of the
market or (c) by any combination of the above. The value of any foreign
securities is based on the applicable currency exchange rate as of the
Evaluation Time.
   The right of redemption may be suspended and payment postponed for any period
during which the New York Stock Exchange is closed, other than for customary
weekend and holiday closings, or any period during which the SEC determines that
trading on that Exchange is restricted or an emergency exists, as a result of
which disposal or evaluation of the Securities is not reasonably practicable, or
for other periods as the SEC may permit.
   Certificates. Ownership of Units is evidenced in book entry form unless a
Unitholder makes a written request to the Trustee that ownership be in
certificate form. Units are transferable by making a written request to the
Trustee and, in the case of Units in certificate form, by presentation of the
certificate to the Trustee properly endorsed or accompanied by a written
instrument or instruments of transfer. A Unitholder must sign the written
request, and certificate or transfer instrument, exactly as his name appears on
the records of the Trustee and on the face of any certificate with the signature
guaranteed by a participant in the Securities Transfer Agents Medallion Program
("STAMP") or a signature guarantee program accepted by the Trustee. In certain
instances the Trustee may require additional documents such as, but not limited
to, trust instruments, certificates of death, appointments as executor or
administrator or certificates of corporate authority. Fractional certificates
will not be issued. The Trustee may require a Unitholder to pay a reasonable fee
for each certificate reissued or transferred and to pay any governmental charge
that may be imposed in connection with each transfer or interchange. Destroyed,
stolen, mutilated or lost certificates will be replaced upon delivery to the
Trustee of satisfactory indemnity, evidence of ownership and payment of expenses
incurred. Mutilated certificates must be surrendered to the Trustee for
replacement.
   Reports Provided. Unitholders will receive a statement of dividends and other
amounts received by a Trust for each distribution. Within a reasonable time
after the end of each year, each person who was a Unitholder during that year
will receive a statement describing dividends and capital received, actual Trust
distributions, Trust expenses, a list of the Securities and other Trust
information. Unitholders may obtain the Evaluator's evaluations of the
Securities upon request.

TRUST ADMINISTRATION
- --------------------------------------------------------------------------------

   Portfolio Administration. The Trusts are not managed funds and, except as
provided in the Trust Agreement, Securities generally will not be sold or
replaced. The Sponsor may, however, direct that Securities be sold in certain
limited circumstances to protect the Trust based on advice from the Supervisor.
These situations may include events such as the issuer having defaulted on
payment of any of its outstanding obligations or the price of a Security has
declined to such an extent or other credit factors exist so that in the opinion
of the Sponsor retention of the Security would be detrimental to the Trust. In
addition, the Trustee may sell Securities to redeem Units or pay Trust expenses
or deferred sales charges. The Trustee must reject any offer for securities or
property in exchange for the Securities. If securities or property are
nonetheless acquired by a Trust, the Sponsor may direct the Trustee to sell the
securities or property and distribute the proceeds to Unitholders or to accept
the securities or property for deposit in the Trust. Should any contract for the
purchase of any of the Securities fail, the Sponsor will (unless substantially
all of the moneys held in the Trust to cover the purchase are reinvested in
substitute Securities in accordance with the Trust Agreement) refund the cash
and sales charge attributable to the failed contract to all Unitholders on or
before the next distribution date.
   When your Trust sells Securities, the composition and diversity of the
Securities in the Trust may be altered. In order to obtain the best price for a
Trust, it may be necessary for the Supervisor to specify minimum amounts
(generally 100 shares) in which blocks of Securities are to be sold. In
effecting purchases and sales of a Trust's portfolio securities, the Sponsor may
direct that orders be placed with and brokerage commissions be paid to brokers,
including brokers which may be affiliated with the Trusts, the Sponsor or
dealers participating in the offering of Units. In addition, in selecting among
firms to handle a particular transaction, the Sponsor may take into account
whether the firm has sold or is selling units of unit investment trusts which it
sponsors.
   Amendment of the Trust Agreement. The Trustee and the Sponsor may amend the
Trust Agreement without the consent of Unitholders to correct any provision
which may be defective or to make other provisions that will not adversely
affect Unitholders (as determined in good faith by the Sponsor and the Trustee).
The Trust Agreement may not be amended to increase the number of Units or permit
acquisition of securities in addition to or substitution for the Securities
(except as provided in the Trust Agreement). The Trustee will notify Unitholders
of any amendment.
   Termination. Each Trust will terminate on the Mandatory Termination Date or
upon the sale or other disposition of the last Security held in the Trust. A
Trust may be terminated at any time with consent of Unitholders representing
two-thirds of the outstanding Units or by the Trustee when the value of the
Trust is less than $500,000 ($3,000,000 if the value of the Trust has exceeded
$15,000,000) (the "Minimum Termination Value"). Unitholders will be notified of
any termination. The Trustee may begin to sell Securities in connection with a
Trust termination nine business days before, and no later than, the Mandatory
Termination Date. Approximately thirty days before this date, the Trustee will
notify Unitholders of the termination and provide a form enabling qualified
Unitholders to elect an in kind distribution of Securities. See "Rights of
Unitholders--Redemption of Units". This form must be returned at least five
business days prior to the Mandatory Termination Date. Unitholders will receive
a final cash distribution within a reasonable time after the Mandatory
Termination Date. All distributions will be net of Trust expenses and costs.
Unitholders will receive a final distribution statement following termination.
The Information Supplement contains further information regarding termination of
the Trusts. See "Additional Information".
   Limitations on Liabilities. The Sponsor, Evaluator, Supervisor and Trustee
are under no liability for taking any action or for refraining from taking any
action in good faith pursuant to the Trust Agreement, or for errors in judgment,
but shall be liable only for their own willful misfeasance, bad faith or gross
negligence (negligence in the case of the Trustee) in the performance of their
duties or by reason of their reckless disregard of their obligations and duties
hereunder. The Trustee is not be liable for depreciation or loss incurred by
reason of the sale by the Trustee of any of the Securities. In the event of the
failure of the Sponsor to act under the Trust Agreement, the Trustee may act
thereunder and is not be liable for any action taken by it in good faith under
the Trust Agreement. The Trustee is not liable for any taxes or other
governmental charges imposed on the Securities, on it as Trustee under the Trust
Agreement or on a Trust which the Trustee may be required to pay under any
present or future law of the United States of America or of any other taxing
authority having jurisdiction. In addition, the Trust Agreement contains other
customary provisions limiting the liability of the Trustee. The Trustee, Sponsor
and Supervisor may rely on any evaluation furnished by the Evaluator and have no
responsibility for the accuracy thereof. Determinations by the Evaluator shall
be made in good faith upon the basis of the best information available to it.
   Sponsor. Van Kampen Funds Inc., a Delaware corporation, is the Sponsor of the
Trust. The Sponsor is an indirect subsidiary of Morgan Stanley Dean Witter & Co.
Van Kampen Funds Inc. specializes in the underwriting and distribution of unit
investment trusts and mutual funds with roots in money management dating back to
1926. The Sponsor is a member of the National Association of Securities Dealers,
Inc. and has offices at One Parkview Plaza, Oakbrook Terrace, Illinois 60181,
(630) 684-6000 and 2800 Post Oak Boulevard, Houston, Texas 77056, (713)
993-0500. As of November 30, 1998, the total stockholders' equity of Van Kampen
Funds Inc. was $135,236,000 (audited). The Information Supplement contains
additional information about the Sponsor.
   If the Sponsor shall fail to perform any of its duties under the Trust
Agreement or become incapable of acting or shall become bankrupt or its affairs
are taken over by public authorities, then the Trustee may (i) appoint a
successor Sponsor at rates of compensation deemed by the Trustee to be
reasonable and not exceeding amounts prescribed by the Securities and Exchange
Commission, (ii) terminate the Trust Agreement and liquidate the Trusts as
provided therein or (iii) continue to act as Trustee without terminating the
Trust Agreement.
   Trustee. The Trustee is The Bank of New York, a trust company organized under
the laws of New York. The Bank of New York has its unit investment trust
division offices at 101 Barclay Street, New York, New York 10286 (800) 221-7668.
The Bank of New York is subject to supervision and examination by the
Superintendent of Banks of the State of New York and the Board of Governors of
the Federal Reserve System, and its deposits are insured by the Federal Deposit
Insurance Corporation to the extent permitted by law. Additional information
regarding the Trustee is set forth in the Information Supplement, including the
Trustee's qualifications and duties, its ability to resign, the effect of a
merger involving the Trustee and the Sponsor's ability to remove and replace the
Trustee. See "Additional Information".
   Performance Information. The Sponsor may from time to time in its advertising
and sales materials compare the then current estimated returns on the Trusts and
returns over specified time periods on other similar Van Kampen trusts (which
may show performance net of expenses and charges which the Trusts would have
charged) with returns on other taxable investments such as the common stocks
comprising the Dow Jones Industrial Average, the S&P 500, other investment
indices, corporate or U.S. government bonds, bank CDs, money market accounts or
money market funds, or with performance data from Lipper Analytical Services,
Inc., Morningstar Publications, Inc. or various publications, each of which has
characteristics that may differ from those of the Trusts. Information on
percentage changes in the dollar value of Units may be included from time to
time in advertisements, sales literature, reports and other information
furnished to current or prospective Unitholders. Total return figures may not be
averaged and may not reflect deduction of the sales charge, which would decrease
return. No provision is made for any income taxes payable. Past performance may
not be indicative of future results. The Trust portfolios are not managed and
Unit price and return fluctuate with the value of common stocks in the
portfolios, so there may be a gain or loss when Units are sold. As with other
performance data, performance comparisons should not be considered
representative of the Trust's relative performance for any future period.

TAXATION
- --------------------------------------------------------------------------------

   The following is a general discussion of certain of the federal income tax
consequences of the purchase, ownership and disposition of the Units of your
Trust. The summary is limited to investors who hold the Units as "capital
assets" (generally, property held for investment within the meaning of Section
1221 of the Internal Revenue Code of 1986 (the "Code")). Unitholders should
consult their tax advisers in determining the federal, state, local and any
other tax consequences of the purchase, ownership and disposition of Units in
the Trust. For purposes of the following discussion and opinion, it is assumed
that each Security in the Trust is equity for federal income tax purposes.
   In the opinion of Chapman and Cutler, special counsel for the Sponsor, under
existing law:
   1. The Trust is not an association taxable as a corporation for federal
income tax purposes; each Unitholder will be treated as the owner of a pro rata
portion of each of the assets of the Trust under the Code; and the income of the
Trust will be treated as income of the Unitholders thereof under the Code. Each
Unitholder will be considered to have received his pro rata share of income
derived from each Security asset when such income is considered to be received
by the Trust.
   2. Each Unitholder will have a taxable event when the Trust disposes of a
Security (whether by sale, exchange, liquidation, redemption, or otherwise) or
upon the sale or redemption of Units by such Unitholder (except to the extent an
in kind distribution of stock is received by such Unitholder as described
below). The price a Unitholder pays for his Units, generally including sales
charges, is allocated among his pro rata portion of each Security held by the
Trust (in proportion to the fair market values thereof on the valuation date
nearest the date the Unitholder purchase his Units) in order to determine his
initial tax basis for his pro rata portion of each Security held by the Trust.
Unitholders should consult their own tax advisers with regard to calculation of
basis. For federal income tax purposes, a Unitholder's pro rata portion of
dividends as defined by Section 316 of the Code paid by a corporation with
respect to a Security held by the Trust are taxable as ordinary income to the
extent of such corporation's current and accumulated "earnings and profits". A
Unitholder's pro rata portion of dividends paid on such Security which exceeds
such current and accumulated earnings and profits will first reduce a
Unitholder's tax basis in such Security, and to the extent that such dividends
exceed a Unitholder's tax basis in such Equity Security shall generally be
treated as capital gain. In general, the holding period for such capital gain
will be determined by the period of time a Unitholder has held his Units.
   3. A Unitholder's portion of gain, if any, upon the sale or redemption of
Units or the disposition of Securities held by the Trust will generally be
considered a capital gain, except in the case of a dealer or a financial
institution. A Unitholder's portion of loss, if any, upon the sale or redemption
of Units or the disposition of Securities held by the Trust will generally be
considered a capital loss (except in the case of a dealer or a financial
institution). Unitholders should consult their tax advisers regarding the
recognition of such capital gains and losses for federal income tax purposes.
   Deferred Sales Charge. Generally, the tax basis of a Unitholder includes
sales charges, and such charges are not deductible. A portion of the sales
charge for the Trust is deferred. The income (or proceeds from redemption) a
Unitholder must take into account for federal income tax purposes is not reduced
by amounts deducted to pay the deferred sales charge. Unitholders should consult
their own tax advisers as to the income tax consequences of the deferred sales
charge.
   Dividends Received Deduction. A Unitholder will be considered to have
received all of the dividends paid on his pro rata portion of each Security when
such dividends are received by the Trust regardless of whether such dividends
are used to pay a portion of a deferred sales charge. Unitholders will be taxed
in this manner regardless of whether distributions from the Trust are actually
received by the Unitholder or are automatically reinvested. A corporation that
owns Units will generally be entitled to a 70% dividends received deduction with
respect to such Unitholder's pro rata portion of dividends received by the Trust
(to the extent such dividends are taxable as ordinary income, as discussed
above, and are attributable to domestic corporations) in the same manner as if
such corporation directly owned the Securities paying such dividends (other than
corporate Unitholders, such as "S" corporations, which are not eligible for the
deduction because of their special characteristics and other than for purposes
of special taxes such as the accumulated earnings tax and the personal holding
corporation tax). However, a corporation owning Units should be aware that
Sections 246 and 246A of the Code impose additional limitations on the
eligibility of dividends for the 70% dividends received deduction. These
limitations include a requirement that stock (and therefore Units) must
generally be held at least 46 days (as determined under Section 246(c) of the
Code). Final regulations have been issued which address special rules that must
be considered in determining whether the 46 day holding requirement is met.
Moreover, the allowable percentage of the deduction will be reduced from 70% if
a corporate Unitholder owns certain stock (or Units) the financing of which is
directly attributable to indebtedness incurred by such corporation. To the
extent dividends received by the Trust are attributable to foreign corporations,
a corporation that owns Units will not be entitled to the dividends received
deduction with respect to its pro rata portion of such dividends, since the
dividends received deduction is generally available only with respect to
dividends paid by domestic corporations. Unitholders should consult with their
tax advisers with respect to the limitations on and possible modifications to
the dividends received deduction.
   Limitations on Deductibility of Trust Expenses by Unitholders. Each
Unitholder's pro rata share of each expense paid by the Trust is deductible by
the Unitholder to the same extent as though the expense had been paid directly
by him. It should be noted that as a result of the Tax Reform Act of 1986,
certain miscellaneous itemized deductions, such as investment expenses, tax
return preparation fees and employee business expenses will be deductible by an
individual only to the extent they exceed 2% of such individual's adjusted gross
income. Unitholders may be required to treat some or all of the expenses of the
Trust as miscellaneous itemized deductions subject to this limitation.
Unitholders should consult with their own tax advisers regarding the
deductibility of Trust expenses.
   Recognition of Taxable Gain or Loss Upon Disposition of Securities by the
Trust or Disposition of Units. As discussed above, a Unitholder may recognize
taxable gain (or loss) when a Security is disposed of by the Trust or if the
Unitholder disposes of a Unit. The Internal Revenue Service Restructing and
Reform Act of 1998 (the "1998 Tax Act") provides that for taxpayers other than
corporations, net capital gain (which is defined as net long-term capital gain
over net short-term capital loss for the taxable year) realized from property
(with certain exclusions) is subject to a maximum marginal stated tax rate of
20% (10% in the case of certain taxpayers in the lowest tax bracket). Capital
gain or loss is long-term if the holding period for the asset is more than one
year, and is short-term if the holding period for the asset is one year or less.
The date on which a Unit is acquired (i.e., the "trade date") is excluded for
purposes of determining the holding period of the Unit. Capital gains realized
from assets held for one year or less are taxed at the same rates as ordinary
income.
   In addition, please note that capital gains may be recharacterized as
ordinary income in the case of certain financial transactions that are
considered "conversion transactions" effective for transactions entered into
after April 30, 1993. Unitholders and prospective investors should consult with
their tax advisers regarding the potential effect of this provision on their
investment in Units.
   If a Unitholder disposes of a Unit he is deemed thereby to have disposed of
his entire pro rata interest in all assets of the Trust including his pro rata
portion of all Securities represented by a Unit.
   The Taxpayer Relief Act of 1997 (the "1997 Tax Act") includes provisions that
treat certain transactions designed to reduce or eliminate risk of loss and
opportunities for gain (e.g., short sales, offsetting notional principal
contracts, futures or forward contracts or similar transactions) as constructive
sales for purposes of recognition of gain (but not of loss) and for purposes of
determining the holding period. Unitholders should consult their own tax
advisers with regard to any such constructive sales rules.
   Special Tax Consequences of In Kind Distributions Upon Redemption of Units or
Termination of the Trust. As discussed in "Rights of Unitholders--Redemption of
Units", under certain circumstances a Unitholder tendering Units for redemption
may request an in kind distribution. A Unitholder may also under certain
circumstances request an in kind distribution upon the termination of the Trust.
See "Rights of Unitholders--Redemption of Units. As previously discussed, prior
to the redemption of Units or the termination of the Trust, a Unitholder is
considered as owning a pro rata portion of each of the Trust's assets for
federal income tax purposes. The receipt of an in kind distribution will result
in a Unitholder receiving an undivided interest in whole shares of stock plus,
possibly, cash.
   The potential tax consequences that may occur under an in kind distribution
with respect to each Security held by the Trust will depend on whether or not a
Unitholder receives cash in addition to Securities. A "Security" for this
purpose is a particular class of stock issued by a particular corporation. A
Unitholder will not recognize gain or loss if a Unitholder only receives
Securities in exchange for his or her pro rata portion in the Securities held by
the Trust. However, if a Unitholder also receives cash in exchange for a
fractional share of such Security held by the Trust, such Unitholder will
generally recognize gain or loss based upon the difference between the amount of
cash received by the Unitholder and his tax basis in such fractional share of a
Security held by the Trust.
   Because the Trust will own many Securities, a Unitholder who requests an in
kind distribution will have to analyze the tax consequences with respect to each
Security owned by the Trust. The amount of taxable gain (or loss) recognized
upon such exchange will generally equal the sum of the gain (or loss) recognized
under the rules described above by such Unitholder with respect to each Security
owned by the Trust. Unitholders who request an in kind distribution are advised
to consult their tax advisers in this regard.
   Computation of the Unitholder's Tax Basis. Initially, a Unitholder's tax
basis in his Units will generally equal the price paid by such Unitholder of his
Units. The cost of the Units is allocated among the Securities held in the Trust
in accordance with the proportion of the fair market values of such Securities
on the valuation date nearest the date the Units are purchased in order to
determine such Unitholder's tax basis for his pro rata portion of each Security.
   A Unitholder's tax basis in his Units and his pro rata portion of a Security
held by the Trust will be reduced to the extent dividends paid with respect to
such Security are received by the Trust which are not taxable as ordinary income
as described above.
   Other Matters. Each Unitholder will be requested to provide the Unitholder's
taxpayer identification number to the Trustee and to certify that the Unitholder
has not been notified that payments to the Unitholder are subject to back-up
withholding. If the proper taxpayer identification number and appropriate
certification are not provided when requested, distributions by the Trust to
such Unitholder (including amounts received upon the redemption of Units) will
be subject to back-up withholding. Distributions by the Trust (other than those
that are not treated as United States source income, if any) will generally be
subject to United States income taxation and withholding in the case of Units
held by non-resident alien individuals, foreign corporations or other non-United
States persons. Such persons should consult their tax advisers.
   In general, income that is not effectively connected to the conduct of a
trade or business within the United States that is earned by non-U.S.
Unitholders and derived from dividends of foreign corporations will not be
subject to U.S. withholding tax provided that less than 25 percent of the gross
income of the foreign corporations for a three-year period ending with the close
of its taxable year preceding payment was effectively connected to the conduct
of a trade or business within the United States. In addition, such earnings may
be exempt from U.S. withholding pursuant to a specific treaty between the United
States and a foreign country. Non-U.S. Unitholders should consult their own tax
advisers regarding the imposition of U.S. withholding on distributions from the
Trust.
   It should be noted that payments to the Trust of dividends on Securities that
are attributable to foreign corporations may be subject to foreign withholding
taxes and Unitholders should consult their tax advisers regarding the potential
tax consequences relating to the payment of any such withholding taxes by the
Trust. Any dividends withheld as a result thereof will nevertheless be treated
as income to the Unitholders. Because, under the grantor trust rules, an
investor is deemed to have paid directly his share of foreign taxes that have
been paid or accrued, if any, an investor may be entitled to a foreign tax
credit or deduction for United States tax purposes with respect to such taxes.
The 1997 Tax Act imposes a required holding period for such credits. Investors
should consult their tax advisers with respect to foreign withholding taxes and
foreign tax credits.
   At the termination of the Trust, the Trustee will furnish to each Unitholder
of the Trust a statement containing information relating to the dividends
received by the Trust on the Securities, the gross proceeds received by the
Trust from the disposition of any Security (resulting from redemption or the
sale of any Security), and the fees and expenses paid by the Trust. The Trustee
will also furnish annual information returns to Unitholders and to the Internal
Revenue Service.
   In the opinion of special counsel to the Trust for New York tax matters, the
Trust is not an association taxable as a corporation and the income of the Trust
will be treated as the income of the Unitholders under the existing income tax
laws of the State and City of New York.
   The foregoing discussion relates only to the tax treatment of U.S.
Unitholders ("U.S. Unitholders") with regard to federal and certain aspects of
New York State and City income taxes. Unitholders may be subject to taxation in
New York or in other jurisdictions and should consult their own tax advisers in
this regard. As used herein, the term "U.S. Unitholder" means an owner of a Unit
of the Trust that (a) is (i) for United States federal income tax purposes a
citizen or resident of the United States, (ii) a corporation, partnership or
other entity created or organized in or under the laws of the United States or
of any political subdivision thereof, or (iii) an estate or trust the income of
which is subject to United States federal income taxation regardless of its
source or (b) does not qualify as a U.S. Unitholder in paragraph (a) but whose
income from a Unit is effectively connected with such Unitholder's conduct of a
United States trade or business. The term also includes certain former citizens
of the United States whose income and gain on the Units will be taxable.
Unitholders should consult their tax advisers regarding potential foreign, state
or local taxation with respect to the Units.

TRUST OPERATING EXPENSES
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   Compensation of Sponsor, Supervisor and Evaluator. The Sponsor will not
receive any fees in connection with its activities relating to the Trusts.
However, the Supervisor and Evaluator, which are affiliates of the Sponsor, will
receive the annual fee for portfolio supervisory and evaluation services set
forth in the "Fee Table". These fees may exceed the actual costs of providing
these services to the Trusts but at no time will the total amount received for
supervisory and evaluation services rendered to all Van Kampen unit investment
trusts in any calendar year exceed the aggregate cost of providing these
services in that year.
   Trustee's Fee. For its services the Trustee will receive the fee from each
Trust set forth in the "Fee Table" (which includes the estimated amount of
miscellaneous Trust expenses). The Trustee benefits to the extent there are
funds in the Capital and Income Accounts since these Accounts are non-interest
bearing to Unitholders and the amounts earned by the Trustee are retained by the
Trustee. Part of the Trustee's compensation for its services to each Trust is
expected to result from the use of these funds.
   Miscellaneous Expenses. The following additional charges are or may be
incurred by a Trust: (a) normal expenses (including the cost of mailing reports
to Unitholders) incurred in connection with the operation of such Trust, (b)
fees of the Trustee for extraordinary services, (c) expenses of the Trustee
(including legal and auditing expenses) and of counsel designated by the
Sponsor, (d) various governmental charges, (e) expenses and costs of any action
taken by the Trustee to protect a Trust and the rights and interests of
Unitholders, (f) indemnification of the Trustee for any loss, liability or
expenses incurred in the administration of a Trust without negligence, bad faith
or wilful misconduct on its part, (g) foreign custodial and transaction fees,
(h) costs associated with liquidating the securities held in a Trust portfolio,
(i) any offering costs incurred after the end of the initial offering period and
(j) expenditures incurred in contacting Unitholders upon termination of a Trust.
Each Trust may pay the expenses of updating its registration statement each
year. Unit investment trust sponsors have historically paid these expenses. Each
Trust will also pay a license fee to the Harry S. Dent Foundation for use of
certain service marks.
   General. The fees and expenses of a Trust will accrue on a daily basis. The
deferred sales charge, fees and expenses are generally paid out of the Capital
Account of the related Trust. When these amounts are paid by or owing to the
Trustee, they are secured by a lien on the related Trust's portfolio. It is
expected that Securities will be sold to pay these amounts which will result in
capital gains or losses to Unitholders. See "Taxation". The Supervisor's,
Evaluator's and Trustee's fees may be increased without approval of the
Unitholders by amounts not exceeding proportionate increases under the category
"All Services Less Rent of Shelter" in the Consumer Price Index or, if this
category is not published, in a comparable category.

OTHER MATTERS
- --------------------------------------------------------------------------------

   Legal Opinions. The legality of the Units offered hereby has been passed upon
by Chapman and Cutler, 111 West Monroe Street, Chicago, Illinois 60603, as
counsel for the Sponsor. Winston & Strawn has acted as counsel to the Trustee
and as special counsel for New York tax matters.
   Independent Certified Public Accountants. The statements of condition and the
related portfolios included in this Prospectus have been audited by Grant
Thornton LLP, independent certified public accountants, as set forth in their
report in this Prospectus, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing.

ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

   This Prospectus does not contain all the information set forth in the
Registration Statement filed by the Trusts with the SEC. The Information
Supplement, which has been filed with the SEC, includes more detailed
information concerning the Securities, investment risks and general information
about the Trusts. The Information Supplement may be obtained by contacting the
Trustee at (800) 856-8487 or is available along with other related materials at
the SEC's internet site (http://www.sec.gov).


   TABLE OF CONTENTS
        Title                                    Page
        -----                                    ----
   Summary of Essential Financial Information..     2
   Fee Table...................................     3
   The Roaring 2000sSM Trusts..................     4
   Notes to Portfolios.........................     7
   The Securities..............................     8
   Report of Independent Certified
      Public Accountants.......................    11
   Statements of Condition ....................    12
   The Trusts..................................   A-1
   Objectives and Securities Selection.........   A-1
   Risk Factors................................   A-2
   Public Offering.............................   A-4
   Retirement Accounts.........................   A-8
   Wrap Fee and Advisory Accounts..............   A-8
   Rights of Unitholders.......................   A-8
   Trust Administration........................  A-10
   Taxation....................................  A-12
   Trust Operating Expenses....................  A-16
   Other Matters...............................  A-16
   Additional Information......................  A-17

- --------------
When Units of the Trusts are no longer available this prospectus may be used as
a preliminary prospectus for a future Trust. If this prospectus is used for
future Trusts you should note the following:

The information in this prospectus is not complete with respect to future Trust
series and may be changed. No person may sell Units of future Trusts until a
registration statement is filed with the Securities and Exchange Commission and
is effective. This prospectus is not an offer to sell Units and is not
soliciting an offer to buy Units in any state where the offer or sale is not
permitted.



                                                                       EMSPRO189

                                                                          #37693

                                   PROSPECTUS


- --------------------------------------------------------------------------------
                                November 23, 1999



                                   Van Kampen
                              Focus Portfolios(SM)


                      The Roaring 2000sSM Trust, Series 4A

                      The Roaring 2000sSM Trust, Series 4B



                              Van Kampen Funds Inc.

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

                             2800 Post Oak Boulevard
                              Houston, Texas 77056

              Please retain this prospectus for future reference.



                                   Van Kampen
                             Information Supplement
                     Van Kampen Focus Portfolios, Series 189



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

     This Information Supplement provides additional information concerning the
risks and operations of the Trusts which is not described in the Prospectus. You
should read this Information Supplement in conjunction with the Prospectus. This
Information Supplement is not a prospectus. It does not include all of the
information that you should consider before investing in the Trusts. This
Information Supplement may not be used to offer or sell Units without the
Prospectus. You can obtain copies of the Prospectus by contacting the Sponsor at
One Parkview Plaza, Oakbrook Terrace, Illinois 60181 or by contacting your
broker. This Information Supplement is dated as of the date of the Prospectus.
All capitalized terms have been defined in the Prospectus.

           Table of Contents
                                                                Page
      Risk Factors                                                 2
      The Trusts                                                   7
      Sponsor Information                                          8
      Trustee Information                                          9
      Trust Termination                                           10

RISK FACTORS
     Price Volatility. Because the Trust may invest in stocks of foreign
companies, you should understand the risks of investing in stocks before
purchasing Units. These risks include the risk that the financial condition of
the company or the general condition of the stock market may worsen and the
value of the stocks (and therefore Units) will fall. Stocks are especially
susceptible to general stock market movements. The value of common stocks often
rises or falls rapidly and unpredictably as market confidence and perceptions of
companies change. These perceptions are based on factors including expectations
regarding government economic policies, inflation, interest rates, economic
expansion or contraction, political climates and economic or banking crises. The
value of Units will fluctuate with the value of the stocks in the Trust and may
be more or less than the price you originally paid for your Units. As with any
investment, we cannot guarantee that the performance of a Trust will be positive
over any period of time. Because the Trust is unmanaged, the Trustee will not
sell stocks in response to market fluctuations as is common in managed
investments.
     Dividends. Stocks represent ownership interests in a company and are not
obligations of the company. Common stockholders have a right to receive payments
from the company that is subordinate to the rights of creditors, bondholders or
preferred stockholders of the company. This means that common stockholders have
a right to receive dividends only if a company's board of directors declares a
dividend and the company has provided for payment of all of its creditors,
bondholders and preferred stockholders. If a company issues additional debt
securities or preferred stock, the owners of these securities will have a claim
against the company's assets before common stockholders if the company declares
bankruptcy or liquidates its assets even though the common stock was issued
first. As a result, the company may be less willing or able to declare or pay
dividends on its common stock.
     Foreign Stocks. Because the Trust may invest in foreign stocks, it involves
additional risks that differ from an investment in domestic stocks. Investments
in foreign securities may involve a greater degree of risk than those in
domestic securities. There is generally less publicly available information
about foreign companies in the form of reports and ratings similar to those that
are published about issuers in the United States. Also, foreign issuers are
generally not subject to uniform accounting, auditing and financial reporting
requirements comparable to those applicable to United States issuers. With
respect to certain foreign countries, there is the possibility of adverse
changes in investment or exchange control regulations, expropriation,
nationalization or confiscatory taxation, limitations on the removal of funds or
other assets of the Trust, political or social instability, or diplomatic
developments which could affect United States investments in those countries.
Moreover, industrial foreign economies may differ favorably or unfavorably from
the United States' economy in terms of growth of gross national product, rate of
inflation, capital reinvestment, resource self-sufficiency and balance of
payments position. Foreign securities markets are generally not as developed or
efficient as those in the United States. While growing in volume, they usually
have substantially less volume than the New York Stock Exchange, and securities
of some foreign issuers are less liquid and more volatile than securities of
comparable United States issuers. Fixed commissions on foreign exchanges are
generally higher than negotiated commissions on United States exchanges. There
is generally less government supervision and regulation of securities exchanges,
brokers and listed issuers than in the United States.
     Foreign Currencies. The Trust may also involve the risk that fluctuations
in exchange rates between the U.S. dollar and foreign currencies may negatively
affect the value of the stocks. For example, if a foreign stock rose 10% in
price but the U.S. dollar gained 5% against the related foreign currency, a U.S.
investor's return would be reduced to about 5%. This is because the foreign
currency would "buy" fewer dollars or, conversely, a dollar would buy more of
the foreign currency. Many foreign currencies have fluctuated widely against the
U.S. dollar for a variety of reasons such as supply and demand of the currency,
investor perceptions of world or country economies, political instability,
currency speculation by institutional investors, changes in government policies,
buying and selling of currencies by central banks of countries, trade balances
and changes in interest rates. The Trust's foreign currency transactions will be
conducted with foreign exchange dealers acting as principals on a spot (i.e.,
cash) buying basis. These dealers realize a profit based on the difference
between the price at which they buy the currency (bid price) and the price at
which they sell the currency (offer price). The Evaluator will estimate the
currency exchange rates based on current activity in the related currency
exchange markets, however, due to the volatility of the markets and other
factors, the estimated rates may not be indicative of the rate the Trust might
obtain had the Trustee sold the currency in the market at that time.
   Financial Services Issuers. The Trust invests significantly in issuers within
the financial services industry. A portfolio concentrated in a single industry
may present more risk than a portfolio broadly diversified over several
industries. The Trust, and therefore Unitholders, may be particularly
susceptible to a negative impact resulting from adverse market conditions or
other factors affecting financial services issuers because any negative impact
on the financial services industry will not be diversified among issuers within
other unrelated industries. Accordingly, an investment in Units should be made
with an understanding of the characteristics of the financial services industry
and the risks which such an investment may entail.
   An investment in Units should be made with an understanding of the problems
and risks inherent in the insurance sector. Companies involved in the insurance
industry are engaged in underwriting, reinsuring, selling, distribution or
placing of property and casualty, life or health insurance. Other growth areas
within the insurance industry include brokerage, reciprocals, claims processors
and multiline insurance companies. Multiline insurance companies provide
property and casualty coverage, as well as life and health insurance. The Trust
may also invest in diversified financial companies with subsidiaries (including
insurance brokerage, reciprocals and claims processors) engaged in underwriting,
reinsuring, selling, distributing or placing insurance with independent third
parties.

   Insurance company profits are affected by interest rate levels, general
economic conditions, and price and marketing competition. Property and casualty
insurance profits may also be affected by weather catastrophes and other
disasters. Life and health insurance profits may be affected by morality and
morbidity rates. Individual companies may be exposed to material risks including
reserve inadequacy and the inability to collect from reinsurance carriers.
Insurance companies are subject to extensive governmental regulation, including
the imposition of maximum rate levels, which may not be adequate for some lines
of business. Proposed or potential tax law changes may also adversely affect
insurance companies' policy sales, tax obligations, and profitability. In
addition to the foregoing, profit margins of these companies continue to shrink
due to the commoditization of traditional businesses, new competitors, capital
expenditures on new technology and the pressures to compete globally.
   In addition to the normal risks of business, companies involved in the
insurance industry are subject to significant risk factors, including those
applicable to regulated insurance companies, such as: (i) the inherent
uncertainty in the process of establishing property-liability loss reserves,
particularly reserves for the cost of environmental, asbestos and mass tort
claims, and the fact that ultimate losses could materially exceed established
loss reserves which could have a material adverse effect on results of
operations and financial condition; (ii) the fact that insurance companies have
experienced, and can be expected in the future to experience, catastrophe losses
which could have a material adverse impact on their financial condition, results
of operations and cash flow; (iii) the inherent uncertainty in the process of
establishing property-liability loss reserves due to changes in loss payment
patterns caused by new claims settlement practices; (iv) the need for insurance
companies and their subsidiaries to maintain appropriate levels of statutory
capital and surplus, particularly in light of continuing scrutiny by rating
organizations and state insurance regulatory authorities, and in order to
maintain acceptable financial strength or claims-paying ability rating; (v) the
extensive regulation and supervision to which insurance companies' subsidiaries
are subject, various regulatory initiatives that may affect insurance companies,
and regulatory and other legal actions; (vi) the adverse impact that increases
in interest rates could have on the value of an insurance company's investment
portfolio and on the attractiveness of certain of its products; (vii) the need
to adjust the effective duration of the assets and liabilities of life insurance
operations in order to meet the anticipated cash flow requirements of its
policyholder obligations; and (viii) the uncertainty involved in estimating the
availability of reinsurance and the collectibility of reinsurance recoverables.
   The state insurance regulatory framework has, during recent years, come under
increased federal scrutiny, and certain state legislatures have considered or
enacted laws that alter and, in many cases, increase state authority to regulate
insurance companies and insurance holding company systems. Further, the National
Association of Insurance Commissioners ("NAIC") and state insurance regulators
are re-examining existing laws and regulations, specifically focusing on
insurance companies, interpretations of existing laws and the development of new
laws. In addition, Congress and certain federal agencies have investigated the
condition of the insurance industry in the United States to determine whether to
promulgate additional federal regulation. The Sponsor is unable to predict
whether any state or federal legislation will be enacted to change the nature or
scope of regulation of the insurance industry, or what effect, if any, such
legislation would have on the industry.
   All insurance companies are subject to state laws and regulations that
require diversification of their investment portfolios and limit the amount of
investments in certain investment categories. Failure to comply with these laws
and regulations would cause non-conforming investments to be treated as
non-admitted assets for purposes of measuring statutory surplus and, in some
instances, would require divestiture. Environmental pollution clean-up is the
subject of both federal and state regulation. By some estimates, there are
thousands of potential waste sites subject to clean up. The insurance industry
is involved in extensive ligation regarding coverage issues. The Comprehensive
Environmental Response Compensation and Liability Act of 1980 ("Superfund") and
comparable state statutes ("mini-Superfund") govern the clean-up and restoration
by "Potentially Responsible Parties" ("PRP's"). Superfund and the
mini-Superfunds ("Environmental Clean-up Laws or "ECLs") establish a mechanism
to pay for clean-up of waste sites if PRP's fail to do so, and to assign
liability to PRP's. The extent of liability to be allocated to PRP is dependent
on a variety of factors. Further, the number of waste sites subject to clean-up
is unknown. Very few sites have been subject to clean-up to date. The extent of
clean-up necessary and the assignment of liability has not been established. The
insurance industry is disrupting many such claims. Key coverage issues include
whether Superfund response costs are considered damages under the policies, when
and how coverage is triggered, applicability of pollution exclusions, the
potential for joint and several liability and definition of an occurrence.
Similar coverage issues exist for clean up and waste sites not covered under
Superfund. To date, courts have been inconsistent in their rulings on these
issues. An insurer's exposure to liability with regard to its insureds which
have been, or may be, named as PRPs is uncertain. Superfund reform proposals
have been introduced in Congress, but none have been enacted. There can be no
assurance that any Superfund reform legislation will be enacted or that any such
legislation will provide for a fair, effective and cost-efficient system for
settlement of Superfund related claims.
   Proposed federal legislation which would permit banks greater participation
in the insurance business could, if enacted, present an increased level of
competition for the sale of insurance products. In addition, while current
federal income tax law permits the tax-deferred accumulation of earnings on the
premiums paid by an annuity owner and holders of certain savings-oriented life
insurance products, no assurance can be given that future tax law will continue
to allow such tax deferrals. If such deferrals were not allowed, consumer demand
for the affected products would be substantially reduced. In addition, proposals
to lower the federal income tax rates through a form of flat tax or otherwise
could have, if enacted, a negative impact on the demand for such products.
   An investment in Units should also be made with an understanding of the
problems and risks of companies engaged in investment banking/brokerage and
investment management. Such companies include brokerage firms, broker/dealers,
investment banks, finance companies and mutual fund companies. Earnings and
share prices of companies in this industry are quite volatile, and often exceed
the volatility levels of the market as a whole. Recently, ongoing consolidation
in the industry and the strong stock market has benefited stocks which investors
believe will benefit from greater investor and issuer activity. Major
determinants of future earnings of these companies are the direction of the
stock market, investor confidence, equity transaction volume, the level and
direction of long-term and short-term interest rates, and the outlook for
emerging markets. Negative trends in any of these earnings determinants could
have a serious adverse effect on the financial stability, as well as the stock
prices, of these companies. Furthermore, there can be no assurance that the
issuers of the Equity Securities will be able to respond in a timely manner to
compete in the rapidly developing marketplace. In addition to the foregoing,
profit margins of these companies continue to shrink due to the commoditization
of traditional businesses, new competitors, capital expenditures on new
technology and the pressures to compete globally.
   Technology Issuers. The Trust invests significantly in issuers within the
technology industry. A portfolio concentrated in a single industry may present
more risk than a portfolio broadly diversified over several industries. The
Trust, and therefore Unitholders, may be particularly susceptible to a negative
impact resulting from adverse market conditions or other factors affecting
technology issuers because any negative impact on the technology industry will
not be diversified among issuers within other unrelated industries. Accordingly,
an investment in Units should be made with an understanding of the
characteristics of the technology industry and the risks which such an
investment may entail.
   Technology companies generally include companies involved in the development,
design, manufacture and sale of computers, computer related equipment, computer
networks, communications systems, telecommunications products, electronic
products, and other related products, systems and services. The market for
technology products and services, especially those specifically related to the
Internet, is characterized by rapidly changing technology, rapid product
obsolescence, cyclical market patterns, evolving industry standards and frequent
new product introductions. The success of the issuers of the Securities depends
in substantial part on the timely and successful introduction of new products.
An unexpected change in one or more of the technologies affecting an issuer's
products or in the market for products based on a particular technology could
have a material adverse affect on an issuer's operating results. Furthermore,
there can be no assurance that the issuers of the Securities will be able to
respond timely to compete in the rapidly developing marketplace.
   The market for certain technology products and services may have only
recently begun to develop, is rapidly evolving and is characterized by an
increasing number of market entrants. Additionally, certain technology companies
may have only recently commenced operations or offered equity securities to the
public. Such companies are in the early stage of development and have a limited
operating history on which to analyze future operating results. It is important
to note that following its initial public offering a security is likely to
experience substantial stock price volatility and speculative trading.
Accordingly, there can be no assurance that upon redemption of Units or
termination of a Trust a Unitholder will receive an amount greater than or equal
to the Unitholder's initial investment.
   Based on trading history, factors such as announcements of new products or
development of new technologies and general conditions of the industry have
caused and are likely to cause the market price of technology common stocks to
fluctuate substantially. In addition, technology company stocks have experienced
extreme price and volume fluctuations that often have been unrelated to the
operating performance of such companies. This market volatility may adversely
affect the market price of the Securities and therefore the ability of a
Unitholder to redeem units, or roll over Units into a new trust, at a price
equal to or greater than the original price paid for such Units.
   Some key components of certain products of technology issuers are currently
available only from single sources. There can be no assurance that in the future
suppliers will be able to meet the demand for components in a timely and cost
effective manner. Accordingly, an issuer's operating results and customer
relationships could be adversely affected by either an increase in price for, or
and interruption or reduction in supply of, any key components. Additionally,
many technology issuers are characterized by a highly concentrated customer base
consisting of a limited number of large customers who may require product
vendors to comply with rigorous and constantly developing industry standards.
Any failure to comply with such standards may result in a significant loss or
reduction of sales. Because many products and technologies are incorporated into
other related products, certain companies are often highly dependent on the
performance of other computer, electronics and communications companies. There
can be no assurance that these customers will place additional orders, or that
an issuer of Securities will obtain orders of similar magnitude as past orders
form other customers. Similarly, the success of certain companies is tied to a
relatively small concentration of products or technologies with intense
competition between companies. Accordingly, a decline in demand of such
products, technologies or from such customers could have a material adverse
impact on issuers of the Securities.
    Health Care Issuers. An investment in Units of the Trust should be made with
an understanding of the problems and risks inherent in the healthcare industry
in general. Healthcare companies involved in advanced medical devices and
instruments, drugs and biotech, managed care, hospital management/health
services and medical supplies have potential risks unique to their sector of the
healthcare field. These companies are subject to governmental regulation of
their products and services, a factor which could have a significant and
possibly unfavorable effect on the price and availability of such products or
services. Furthermore, such companies face the risk of increasing competition
from new products or services, generic drug sales, termination of patent
protection for drug or medical supply products and the risk that technological
advances will render their products obsolete. The research and development costs
of bringing a drug to market are substantial, and include lengthy governmental
review processes with no guarantee that the product will ever come to market.
Many of these companies may have losses and not offer certain products for
several years. Such companies may also have persistent losses during a new
product's transition from development to production, and revenue patterns may be
erratic. In addition, healthcare facility operators may be affected by events
and conditions including, among other things, demand for services, the ability
of the facility to provide the services required, physicians' confidence in the
facility, management capabilities, competition with other hospitals, efforts by
insurers and governmental agencies to limit rates, legislation establishing
state rate-setting agencies, expenses, government regulation, the cost and
possible unavailability of malpractice insurance and the termination or
restriction of governmental financial assistance, including that associated with
Medicare, Medicaid and other similar third-party payor programs.
    Legislative proposals concerning healthcare are proposed in Congress from
time to time. These proposals span a wide range of topics, including cost and
price controls (which might include a freeze on the prices of prescription
drugs), national health insurance, incentives for competition in the provision
of healthcare services, tax incentives and penalties related to healthcare
insurance premiums and promotion of pre-paid healthcare plans. The Sponsor is
unable to predict the effect of any of these proposals, if enacted, on the
issuers of Securities in the Trust.
     Liquidity. Whether or not the stocks in the Trust are listed on a stock
exchange, the stocks may delist from the exchange or principally trade in an
over-the-counter market. As a result, the existence of a liquid trading market
could depend on whether dealers will make a market in the stocks. We cannot
guarantee that dealers will maintain a market or that any market will be liquid.
The value of the stocks could fall if trading markets are limited or absent.
     Additional Units. The Sponsor may create additional Units of the Trust by
depositing into the Trust additional stocks or cash with instructions to
purchase additional stocks. A cash deposit could result in a dilution of your
investment and anticipated income because of fluctuations in the price of the
stocks between the time of the deposit and the purchase of the stocks and
because the Trust will pay brokerage fees.
     Voting. Only the Trustee may sell or vote the stocks in the Trust. While
you may sell or redeem your Units, you may not sell or vote the stocks in your
Trust. The Sponsor will instruct the Trustee how to vote the stocks. The Trustee
will vote the stocks in the same general proportion as shares held by other
shareholders if the Sponsor fails to provide instructions.
     Year 2000. The Trust could be negatively impacted if computer systems used
by the Sponsor, Evaluator, Supervisor or Trustee or other service providers to
the Trusts do not properly process date-related information after January 1,
2000. This is commonly known as the "Year 2000 Problem". The Sponsor, Evaluator,
Supervisor and Trustee are taking steps to address this problem and to obtain
reasonable assurances that other service providers to the Trust are taking
comparable steps. We cannot guarantee that these steps will be sufficient to
avoid any adverse impact on the Trust. This problem is expected to impact
corporations to varying degrees based on factors such as industry sector and
degree of technological sophistication. We cannot predict what impact, if any,
this problem will have on the issuers of stocks in the Trust.


THE TRUSTS
   Harry S. Dent, Jr. believes that the economy may be on the edge of economic
change that may change how people communicate and fundamentally alter how and
where people live and work. At the same time, Mr. Dent believes the Baby Boom
generation will reach its peak earning, spending and productivity years. Mr.
Dent believes that the convergence of these two events could spark the trends of
the years ahead.
   The Roaring 2000sSM Trusts were designed to benefit from the insights,
philosophies and strategies found in the book, "The Roaring 2000s," by Harry S.
Dent, Jr.
   Family spending cycles of each new generation of consumers and workers drive
the economy. Birth rates, because they show how many people are in a generation,
may be a leading indicator of the economy. As a generation develops and moves
into its peak family spending cycle, the economy may rise.
   To account for the number of people at their peak spending age at a given
time, Mr. Dent lags the birth index forward 46.5 years (the average person
historically hits their peak spending at approximately 46.5 years of age). After
consideration of this lag, the birth index and the Dow Jones Industrial Average,
adjusted for inflation, have exhibited a close correlation in the past. Mr. Dent
believes that this "Spending Wave" may enable a connection to be made, helping
to forecast the economy in the future. Of course, past performance is no
guarantee of future results.
   Based on the cycles discussed previously, Mr. Dent has identified various
sectors of our economy that may be primed for growth potential. The Roaring
2000s Trusts seek to capitalize on trends impacting four main sectors,
including:

   o  Technology - New Technologies may be shaping new standards in the way
      people work and live. Businesses may be beginning to prepare for
      downshifts in the labor force by investing in labor saving technology that
      could improve productivity and lower costs.

   o  Financial Services - The Baby Boomers may be forced to become investors
      and, therefore, may need to seek financial advice. Additionally, choices
      for investing are numerous and complicated. As our economy grows, so may
      additional opportunities for investment vehicles.

   o  Health Care - As the Baby Boomers age, health care may become increasingly
      important as needs statistically begin to rise. As people age they tend to
      spend more of their income on health care costs. As technologies increase,
      Americans may find more options and choices in this sector than ever
      before.

   o  U.S. Multinational Companies - A global marketplace is emerging and many
      U.S.-based companies appear to be experiencing new sales growth through
      the elimination of geographical barriers that once inhibited sales. Now,
      through technology increases, multinational companies may be emerging as
      market leaders internationally as well as domestically.

   The Sponsor selected each portfolio based on concepts presented in The
Roaring 2000s and research compiled by Mr. Dent. Mr. Dent did not select the
stocks for the portfolios, does not endorse the Trusts and will not supervise
the portfolios. The opinions and forecasts of Mr. Dent expressed in his books
and elsewhere are not necessarily those of Van Kampen Funds Inc. and may not
actually come to pass. Mr. Dent is being compensated by the Sponsor for his
research. The Roaring 2000sSM is the exclusive property of The H.S. Dent
Foundation. The Roaring 2000sSM is a service mark of the H.S. Dent Foundation.
Each Trust has licensed the use of this service mark from the H.S. Dent
Foundation.


   The Roaring 2000sSM is the exclusive property of The H.S. Dent Foundation.
The Roaring 2000sSM is a service mark of the H.S. Dent Foundation and has been
licensed for use by Van Kampen Funds Inc.
   This fund is not sponsored, endorsed, sold or promoted by the H.S. Dent
Foundation. The H.S. Dent Foundation makes no representation or warranty,
express or implied, to the owners of this fund or any member of the public
regarding the advisability of investing in funds generally or in this fund
particularly. The H.S. Dent Foundation is the licensor of certain trademarks,
service marks and trade names of the H.S. Dent Foundation. The H.S. Dent
Foundation is not responsible for and has not participated in the determination
of the timing of, prices at, or quantities of this fund to be issued. The H.S.
Dent Foundation has no obligation or liability to owners of this fund in
connection with the administration, marketing or trading of this fund.
   NEITHER THE H.S. DENT FOUNDATION NOR ANY OTHER RELATED PARTY GUARANTEES THE
ACCURACY AND/OR THE COMPLETENESS OF ANY DATA INCLUDED THEREIN. NEITHER THE H.S.
DENT FOUNDATION NOR ANY OTHER RELATED PARTY MAKES ANY WARRANTY, EXPRESS OR
IMPLIED, AS TO RESULTS TO BE OBTAINED BY LICENSEE, LICENSEE'S CUSTOMERS AND
COUNTERPARTIES, OWNERS OF THE FUND, OR ANY OTHER PERSON OR ENTITY FROM THE USE
OF ANY DATA INCLUDED HEREIN IN CONNECTION WITH THE RIGHTS LICENSED HEREUNDER OR
FOR ANY OTHER USE. NEITHER THE H.S. DENT FOUNDATION NOR ANY OTHER RELATED PARTY
MAKES ANY EXPRESS OR IMPLIED WARRANTIES, AND THE H.S. DENT FOUNDATION HEREBY
EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE WITH RESPECT TO ITS SERVICE MARKS. WITHOUT LIMITING ANY OF
THE FORE-GOING, IN NO EVENT SHALL THE H.S. DENT FOUNDATION OR ANY OTHER RELATED
PARTY HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE,
CONSEQUENTIAL OR ANY OTHER DAMAGES (INCLUDING LOST PROFITS) EVEN IF NOTIFIED OF
THE POSSIBILITY OF SUCH DAMAGES.

SPONSOR INFORMATION
   Van Kampen Funds Inc., a Delaware corporation, is the Sponsor of the Trust.
The Sponsor is an indirect subsidiary of Van Kampen Investments Inc. Van Kampen
Investments Inc. is a wholly owned subsidiary of MSAM Holdings II, Inc., which
in turn is a wholly owned subsidiary of Morgan Stanley Dean Witter & Co.
("MSDW").
     MSDW, together with various of its directly and indirectly owned
subsidiaries, is engaged in a wide range of financial services through three
primary businesses: securities, asset management and credit services. These
principal businesses include securities underwriting, distribution and trading;
merger, acquisition, restructuring and other corporate finance advisory
activities; merchant banking; stock brokerage and research services; asset
management; trading of futures, options, foreign exchange commodities and swaps
(involving foreign exchange, commodities, indices and interest rates); real
estate advice, financing and investing; global custody, securities clearance
services and securities lending; and credit card services.
     Van Kampen Funds Inc. specializes in the underwriting and distribution of
unit investment trusts and mutual funds with roots in money management dating
back to 1926. The Sponsor is a member of the National Association of Securities
Dealers, Inc. and has offices at One Parkview Plaza, Oakbrook Terrace, Illinois
60181, (630) 684-6000 and 2800 Post Oak Boulevard, Houston, Texas 77056, (713)
993-0500. As of November 30, 1998, the total stockholders' equity of Van Kampen
Funds Inc. was $135,236,000 (audited). (This paragraph relates only to the
Sponsor and not to the Trust or to any other Series thereof. The information is
included herein only for the purpose of informing investors as to the financial
responsibility of the Sponsor and its ability to carry out its contractual
obligations. More detailed financial information will be made available by the
Sponsor upon request.)
     As of March 31, 1999, the Sponsor and its Van Kampen affiliates managed or
supervised approximately $75 billion of investment products. The Sponsor and its
Van Kampen affiliates managed $64 billion of assets, consisting of $36.6 billion
for 50 open-end mutual funds, $19.5 billion for 39 closed-end funds and $8.2
billion for 106 institutional accounts. The Sponsor has also deposited more than
3,200 unit trusts amounting to approximately $35.4 billion of assets. All of Van
Kampen's open-end funds, closed-ended funds and unit investment trusts are
professionally distributed by leading financial firms nationwide. Based on
cumulative assets deposited, the Sponsor believes that it is the largest sponsor
of insured municipal unit investment trusts, primarily through the success of
its Insured Municipals Income Trust(R) or the IM-IT(R) trust. The Sponsor also
provides surveillance or evaluation services at cost for approximately $13.4
billion of unit investment trust assets outstanding. Since 1976, the Sponsor has
serviced over two million investor accounts, opened through retail distribution
firms.
   If the Sponsor shall fail to perform any of its duties under the Trust
Agreement or become incapable of acting or shall become bankrupt or its affairs
are taken over by public authorities, then the Trustee may (i) appoint a
successor Sponsor at rates of compensation deemed by the Trustee to be
reasonable and not exceeding amounts prescribed by the Securities and Exchange
Commission, (ii) terminate the Trust Agreement and liquidate the Trust as
provided therein or (iii) continue to act as Trustee without terminating the
Trust Agreement.

TRUSTEE INFORMATION
     The Trustee is The Bank of New York, a trust company organized under the
laws of New York. The Bank of New York has its unit investment trust division
offices at 101 Barclay Street, New York, New York 10286 (800) 221-7668. The Bank
of New York is subject to supervision and examination by the Superintendent of
Banks of the State of New York and the Board of Governors of the Federal Reserve
System, and its deposits are insured by the Federal Deposit Insurance
Corporation to the extent permitted by law.
   The duties of the Trustee are primarily ministerial in nature. It did not
participate in the selection of Securities for the Trust portfolio.
   In accordance with the Trust Agreement, the Trustee shall keep proper books
of record and account of all transactions at its office for the Trust. Such
records shall include the name and address of, and the number of Units of the
Trust held by, every Unitholder. Such books and records shall be open to
inspection by any Unitholder at all reasonable times during the usual business
hours. The Trustee shall make such annual or other reports as may from time to
time be required under any applicable state or federal statute, rule or
regulation. The Trustee is required to keep a certified copy or duplicate
original of the Trust Agreement on file in its office available for inspection
at all reasonable times during the usual business hours by any Unitholder,
together with a current list of the Securities held in the Trust.
     Under the Trust Agreement, the Trustee or any successor trustee may resign
and be discharged of its responsibilities created by the Trust Agreement by
executing an instrument in writing and filing the same with the Sponsor. The
Trustee or successor trustee must mail a copy of the notice of resignation to
all Unitholders then of record, not less than 60 days before the date specified
in such notice when such resignation is to take effect. The Sponsor upon
receiving notice of such resignation is obligated to appoint a successor trustee
promptly. If, upon such resignation, no successor trustee has been appointed and
has accepted the appointment within 30 days after notification, the retiring
Trustee may apply to a court of competent jurisdiction for the appointment of a
successor. The Sponsor may remove the Trustee and appoint a successor trustee as
provided in the Trust Agreement at any time with or without cause. Notice of
such removal and appointment shall be mailed to each Unitholder by the Sponsor.
Upon execution of a written acceptance of such appointment by such successor
trustee, all the rights, powers, duties and obligations of the original trustee
shall vest in the successor. The resignation or removal of a Trustee becomes
effective only when the successor trustee accepts its appointment as such or
when a court of competent jurisdiction appoints a successor trustee.
     Any corporation into which a Trustee may be merged or with which it may be
consolidated, or any corporation resulting from any merger or consolidation to
which a Trustee shall be a party, shall be the successor trustee. The Trustee
must be a banking corporation organized under the laws of the United States or
any state and having at all times an aggregate capital, surplus and undivided
profits of not less than $5,000,000.

TRUST TERMINATION
     The Trust may be liquidated at any time by consent of Unitholders
representing 66 2/3% of the Units of the Trust then outstanding or by the
Trustee when the value of the Securities owned by the Trust, as shown by any
evaluation, is less than $500,000 ($3,000,000 if the value of the Trust has
exceeded $15,000,000). The Trust will be liquidated by the Trustee in the event
that a sufficient number of Units of the Trust not yet sold are tendered for
redemption by the Sponsor, so that the net worth of the Trust would be reduced
to less than 40% of the value of the Securities at the time they were deposited
in the Trust. If the Trust is liquidated because of the redemption of unsold
Units by the Sponsor, the Sponsor will refund to each purchaser of Units the
entire sales charge paid by such purchaser. The Trust Agreement will terminate
upon the sale or other disposition of the last Security held thereunder, but in
no event will it continue beyond the Mandatory Termination Date.
     Commencing during the period beginning nine business days prior to, and no
later than, the Mandatory Termination Date, Securities will begin to be sold in
connection with the termination of the Trust. The Sponsor will determine the
manner, timing and execution of the sales of the Securities. The Sponsor shall
direct the liquidation of the Securities in such manner as to effectuate orderly
sales and a minimal market impact. In the event the Sponsor does not so direct,
the Securities shall be sold within a reasonable period and in such manner as
the Trustee, in its sole discretion, shall determine. At least 30 days before
the Mandatory Termination Date the Trustee will provide written notice of any
termination to all Unitholders of the Trust and in the case of the Trust will
include with such notice a form to enable Unitholders owning 1,000 or more Units
to request an in kind distribution of the U.S.-traded Securities. To be
effective, this request must be returned to the Trustee at least five business
days prior to the Mandatory Termination Date. On the Mandatory Termination Date
(or on the previous business day if a holiday) the Trustee will deliver each
requesting Unitholder's pro rata number of whole shares of the U.S.-traded
Securities in the Trust to the account of the broker-dealer or bank designated
by the Unitholder at Depository Trust Company. A Unitholder electing an in kind
distribution will not receive a distribution of shares of the foreign
exchange-traded Securities but will instead receive cash representing his pro
rata portion of such Securities. The value of the Unitholder's fractional shares
of the Securities will be paid in cash. Unitholders with less than 1,000 Units
and Unitholders in the Trust with 1,000 or more Units not requesting an in kind
distribution will receive a cash distribution from the sale of the remaining
Securities within a reasonable time following the Mandatory Termination Date.
Regardless of the distribution involved, the Trustee will deduct from the funds
of the Trust any accrued costs, expenses, advances or indemnities provided by
the Trust Agreement, including estimated compensation of the Trustee, costs of
liquidation and any amounts required as a reserve to provide for payment of any
applicable taxes or other governmental charges. Any sale of Securities in a
Trust upon termination may result in a lower amount than might otherwise be
realized if such sale were not required at such time. The Trustee will then
distribute to the Unitholder of the Trust his pro rata share of the balance of
the Income and Capital Accounts of the Trust.
     The Sponsor currently intends to, but is not obligated to, offer for sale
units of a subsequent series of the Trust. There is, however, no assurance that
units of any new series of the Trust will be offered for sale at that time, or
if offered, that there will be sufficient units available for sale to meet the
requests of any or all Unitholders.
     Within 60 days of the final distribution Unitholders will be furnished a
final distribution statement of the amount distributable. At such time as the
Trustee in its sole discretion will determine that any amounts held in reserve
are no longer necessary, it will make distribution thereof to Unitholders in the
same manner.



                       CONTENTS OF REGISTRATION STATEMENTS

This Amendment to the Registration Statement comprises the following papers and
documents:


         The facing sheet
         The Prospectus
         The signatures
         The consents of independent public accountants and legal counsel

The following exhibits:

          1.1  Copy of Trust Agreement.

          3.1  Opinion and consent of counsel as to legality of securities being
               registered.

          3.2  Opinion of counsel as to the Federal Income tax status of
               securities being registered.

          3.3  Opinion and consent of counsel as to New York tax status of
               securities being registered.

          4.1  Consent of Interactive Data Corporation.

          4.2  Consent of Independent Certified Public Accountants.


                                   SIGNATURES

         The Registrant, Van Kampen Focus Portfolios, Series 189, hereby
identifies Van Kampen Merritt Equity Opportunity Trust, Series 1, Series 2,
Series 4 and Series 7 and Van Kampen American Capital Equity Opportunity Trust,
Series 13, Series 14, Series 57 and Series 89 for purposes of the
representations required by Rule 487 and represents the following: (1) that the
portfolio securities deposited in the series as to the securities of which this
Registration Statement is being filed do not differ materially in type or
quality from those deposited in such previous series; (2) that, except to the
extent necessary to identify the specific portfolio securities deposited in, and
to provide essential financial information for, the series with respect to the
securities of which this Registration Statement is being filed, this
Registration Statement does not contain disclosures that differ in any material
respect from those contained in the registration statements for such previous
series as to which the effective date was determined by the Commission or the
staff; and (3) that it has complied with Rule 460 under the Securities Act of
1933.

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Van Kampen Focus Portfolios, Series 189 has duly caused this
Amendment to the Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Chicago and State of
Illinois on the 23rd day of November, 1999.

                                         Van Kampen Focus Portfolios, Series 189
                                                        By Van Kampen Funds Inc.

                                                          By Christine K. Putong
                                                        Assistant Vice President

         Pursuant to the requirements of the Securities Act of 1933, this
Amendment to the Registration Statement has been signed below on November 23,
1999 by the following persons who constitute a majority of the Board of
Directors of Van Kampen Funds Inc.

          SIGNATURE                             TITLE

Richard F. Powers III               Chairman and Chief Executive              )

                                       Officer                                )

John H. Zimmerman III               President and Chief Operating             )

                                       Officer                                )

William R. Rybak                    Executive Vice President and              )
                                       Chief Financial Officer                )

A. Thomas Smith III                 Executive Vice President,                 )
                                       General Counsel and Secretary          )

Michael H. Santo                    Executive Vice President                  )


                                                             Christine K. Putong
                                                             (Attorney-in-fact*)

- --------------------------------------------------------------------------------
         *An executed copy of each of the related powers of attorney is filed
herewith or was filed with the Securities and Exchange Commission in connection
with the Registration Statement on Form S-6 of Van Kampen Focus Portfolios,
Series 136 (File No. 333-70897) and the same are hereby incorporated herein by
this reference.






                                                                     EXHIBIT 1.1
                           VAN KAMPEN FOCUS PORTFOLIOS
                                   SERIES 189
                                 TRUST AGREEMENT

Dated: November 23, 1999

         This Trust Agreement among Van Kampen Funds Inc., as Depositor,
American Portfolio Evaluation Services, a division of Van Kampen Investment
Advisory Corp., as Evaluator, Van Kampen Investment Advisory Corp., as
Supervisory Servicer, and The Bank of New York, as Trustee, sets forth certain
provisions in full and incorporates other provisions by reference to the
document entitled "Van Kampen American Capital Equity Opportunity Trust, Series
87 and Subsequent Series, Standard Terms and Conditions of Trust, Effective
January 27, 1998" (herein called the "Standard Terms and Conditions of Trust")
and such provisions as are set forth in full and such provisions as are
incorporated by reference constitute a single instrument. All references herein
to Articles and Sections are to Articles and Sections of the Standard Terms and
Conditions of Trust.


                                WITNESSETH THAT:

         In consideration of the premises and of the mutual agreements herein
contained, the Depositor, Evaluator, Supervisory Servicer and Trustee agree as
follows:


                                     PART I
                     STANDARD TERMS AND CONDITIONS OF TRUST

         Subject to the provisions of Part II hereof, all the provisions
contained in the Standard Terms and Conditions of Trust are herein incorporated
by reference in their entirety and shall be deemed to be a part of this
instrument as fully and to the same extent as though said provisions had been
set forth in full in this instrument.


                                     PART II
                      SPECIAL TERMS AND CONDITIONS OF TRUST

         The following special terms and conditions are hereby agreed to:

         1. The Securities defined in Section 1.01(24), listed in the Schedule
hereto, have been deposited in trust under this Trust Agreement.

         2. The fractional undivided interest in and ownership of each Trust
represented by each Unit is an amount the numerator of which is one and the
denominator of which is the amount set forth under "Summary of Essential
Financial Information - Initial Number of Units" in the Prospectus. Such
fractional undivided interest may be (a) increased by the number of any
additional Units issued pursuant to Section 2.03, (b) increased or decreased in
connection with an adjustment to the number of Units pursuant to Section 2.03,
or (c) decreased by the number of Units redeemed pursuant to Section 5.02.

         3. The terms "Capital Account Record Date" and "Income Account Record
Date" shall mean the "Record Dates" set forth under "Summary of Essential
Financial Information" in the Prospectus.

         4. The terms "Capital Account Distribution Date" and "Income Account
Distribution Date" shall mean the "Distribution Dates" set forth under "Summary
of Essential Financial Information" in the Prospectus.

         5. The term "Mandatory Termination Date" shall mean the "Mandatory
Termination Date" set forth under "Summary of Essential Financial Information"
in the Prospectus.

         6. Notwithstanding anything to the contrary in the Standard Terms and
Conditions of Trust and subject to the requirements set forth in this paragraph,
unless the Prospectus otherwise requires, the Sponsor may, on any Business Day
(the "Trade Date"), subscribe for additional Units as follows:

               (a) Prior to the Evaluation Time on such Business Day, the
          Sponsor shall provide notice (the "Subscription Notice") to the
          Trustee, by telephone or by written communication, of the Sponsor's
          intention to subscribe for additional Units. The Subscription Notice
          shall identify the additional Securities to be acquired (unless such
          additional Securities are a precise replication of the then existing
          portfolio) and shall either (i) specify the quantity of additional
          Securities to be deposited by the Sponsor on the settlement date for
          such subscription or (ii) instruct the Trustee to purchase additional
          Securities with an aggregate value as specified in the Subscription
          Notice.

               (b) Promptly following the Evaluation Time on such Business Day,
          the Sponsor shall verify with the Trustee the number of additional
          Units to be created.

               (c) Not later than the time on the settlement date for such
          subscription when the Trustee is to deliver or assign the additional
          Units created hereby, the Sponsor shall deposit with the Trustee (i)
          any additional Securities specified in the Subscription Notice (or
          contracts to purchase such additional Securities together with cash or
          a letter of credit in the amount necessary to settle such contracts)
          or (ii) cash or a letter of credit in an amount equal to the aggregate
          value of the additional Securities specified in the Subscription
          Notice, and adding and subtracting the amounts specified in the first
          and second sentences of Section 5.01, computed as of the Evaluation
          Time on the Business Day preceding the Trade Date divided by the
          number of Units outstanding as of the Evaluation Time on the Business
          Day preceding the Trade Date, times the number of additional Units to
          be created.

               (d) On the settlement date for such subscription, the Trustee
          shall, in exchange for the Securities and cash or letter of credit
          described above, deliver to, or assign in the name of or on the order
          of, the Sponsor the number of Units verified by the Sponsor with the
          Trustee.

         7. Section 6.01(e) is hereby replaced with the following:

               (e) (1) Subject to the provisions of subparagraph (2) of this
          paragraph, the Trustee may employ agents, sub-custodians, attorneys,
          accountants and auditors and shall not be answerable for the default
          or misconduct of any such agents, sub-custodians, attorneys,
          accountants or auditors if such agents, sub-custodians, attorneys,
          accountants or auditors shall have been selected with reasonable care.
          The Trustee shall be fully protected in respect of any action under
          this Indenture taken or suffered in good faith by the Trustee in
          accordance with the opinion of counsel, which may be counsel to the
          Depositor acceptable to the Trustee, provided, however that this
          disclaimer of liability shall not excuse the Trustee from the
          responsibilities specified in subparagraph (2) below. The fees and
          expenses charged by such agents, sub-custodians, attorneys,
          accountants or auditors shall constitute an expense of the Trust
          reimbursable from the Income and Capital Accounts of the affected
          Trust as set forth in section 6.04 hereof.

               (2) The Trustee may place and maintain in the care of an Eligible
          Foreign Custodian (which is employed by the Trustee as a sub-custodian
          as contemplated by subparagraph (1) of this paragraph (e) and which
          may be an affiliate or subsidiary of the Trustee or any other entity
          in which the Trustee may have an ownership interest) any investments
          (including foreign currencies) for which the primary market is outside
          the United States, and such cash and cash equivalents in amounts
          reasonably necessary to effect the Trust's transactions in such
          investments, provided that:

                    (a) The Trustee shall perform all duties assigned to the
               Foreign Custody Manager by Rule 17f-5 under the Investment
               Company Act of 1940 (17 CFR ss. 270.17f-5) ("Rule 17f-5"), as now
               in effect or as such rule may be amended in the future. The
               Trustee shall not delegate such duties.

                    (b) The Trustee shall exercise reasonable care, prudence and
               diligence such as a person having responsibility for the
               safekeeping of Trust assets would exercise, and shall be liable
               to the Trust for any loss occurring as a result of its failure to
               do so.

                    (c) The Trustee shall indemnify the Trust and hold the Trust
               harmless from and against any risk of loss of Trust assets held
               in accordance with the foreign custody contract.

                    (d) The Trustee shall maintain and keep current written
               records regarding the basis for the choice or continued use of a
               particular Eligible Foreign Custodian pursuant to this
               subparagraph for a period of not less than six years from the end
               of the fiscal year in which the Trust was terminated, the first
               two years in an easily accessible place. Such records shall be
               available for inspection by Unitholders and the Securities and
               Exchange Commission at the Trustee's offices at all reasonable
               times during its usual business hours.

               (3) "Eligible Foreign Custodian" shall have the meaning assigned
          to it in Rule 17f-5.

               (4) "Foreign Custody Manager" shall have the meaning assigned to
          it in Rule 17f-5.

         8. Section 1.01 (1), (3) and (4) shall be replaced in their entirety by
the following:

               (1) "Depositor" shall mean Van Kampen Funds Inc. and its
          succesors in interest, or any successor depositor appointed as
          hereinafter provided.

               (3) "Evaluator" shall mean American Portfolio Evaluation Services
          (a division of a Van Kampen Investment Advisory Corp.) and its
          successors in interest, or any successor evaluator appointed as
          hereinafter provided.

               (4) "Supervisory Servicer" shall mean Van Kampen Investment
          Advisory Corp. and its successors in interest, or any successor
          portfolio supervisor appointed as hereinafter provided.

         9. Section 3.15 of the Standard Terms and Conditions of Trust is hereby
replaced in its entirety by the following:

               Section 3.15. Deferred Sales Charge. If the Prospectus related to
          the Trust specifies a deferred sale charge, the Trustee shall, on each
          Deferred Sales Charge Payment Date and as permitted by such
          Prospectus, withdraw from the Capital Account an amount per Unit equal
          to the Deferred Sales Charge Payment and credit such amount to a
          special non-Trust account maintained at the Trustee out of which the
          deferred sales charge will be distributed to the Depositor. If the
          balance in the Capital Account is insufficient to make any such
          withdrawal, the Trustee shall, as directed by the Depositor, either
          advance funds in an amount equal to the proposed withdrawal and be
          entitled to reimbursement of such advance upon the deposit of
          additional moneys in the Capital Account, sell Securities and credit
          the proceeds thereof to such special Depositor's account or credit (if
          permitted by law) Securities in kind to such special Depositor's
          Account. If a Unitholder redeems Units prior to full payment of the
          deferred sales charge, the Trustee shall, if so provided in the
          related Prospectus, on the Redemption Date, withhold from the
          Redemption Price payable to such Unitholder an amount equal to the
          unpaid portion of the deferred sales charge and distribute such amount
          to such special Depositor's Account. The Depositor may at any time
          instruct the Trustee in writing to distribute to the Depositor cash or
          Securities previously credited to the special Depositor's account.
          Amounts to be credited to the special Depositor's account with respect
          to each Deferred Sales Charge Payment are due and payable to the
          Depositor on the related Deferred Sales Charge Payment Date.

               The term "Deferred Sales Charge Payment Dates" shall mean the
          10th day of each month beginning April 10, 2000 and continuing through
          November 10, 2000. If any Deferred Sales Charge Payment Date is not a
          Business Day, that Deferred Sales Charge Payment Date shall be deemed
          to be the next business day. The term "Deferred Sales Charge Payment"
          shall mean a fraction of the total maximum deferred sales charge
          specified in the Prospectus, the numerator of which is one and the
          denominator of which is equal to the total number of Deferred Sales
          Charge Payment Dates.

         IN WITNESS WHEREOF, the undersigned have caused this Trust Agreement to
be executed and their corporate seals to be hereto affixed and attested; all as
of the day, month and year first above written.


Van Kampen Funds Inc.

By James J. Boyne
Senior Vice President
Attest:


By Weston B. Wetherell
Vice President
American Portfolio Evaluation Services,
   a division of Van Kampen Investment Advisory Corp.

By James J. Boyne
Senior Vice President
Attest

By Weston B. Wetherell
Vice President
Van Kampen Investment Advisory Corp.

By James J. Boyne
Senior Vice President
Attest

By Weston B. Wetherell
Vice President

The Bank of New York

By Jeffrey Cohen
Vice President
Attest

By Robert Weir
Assistant Treasurer


                          SCHEDULE A TO TRUST AGREEMENT
                        SECURITIES INITIALLY DEPOSITED IN
                     VAN KAMPEN FOCUS PORTFOLIOS, SERIES 189

(Note: Incorporated herein and made a part hereof is each "Portfolio" as set
forth in the Prospectus.)







                                                                     EXHIBIT 3.1

                               CHAPMAN AND CUTLER
                             111 WEST MONROE STREET
                             CHICAGO, ILLINOIS 60603

November 23, 1999


Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181


Re:  Van Kampen Focus Portfolios, Series 189
     ---------------------------------------

Gentlemen:

         We have served as counsel for Van Kampen Funds Inc. as Sponsor and
Depositor of Van Kampen Focus Portfolios, Series 189 (hereinafter referred to as
the "Trust"), in connection with the preparation, execution and delivery of a
Trust Agreement dated November 23, 1999, among Van Kampen Funds Inc., as
Depositor, American Portfolio Evaluation Services, a division of Van Kampen
Investment Advisory Corp., as Evaluator, Van Kampen Investment Advisory Corp.,
as Supervisory Servicer, and The Bank of New York, as Trustee, pursuant to which
the Depositor has delivered to and deposited the Securities listed in the
Schedule to the Trust Agreement with the Trustee and pursuant to which the
Trustee has provided to or on the order of the Depositor documentation
evidencing ownership of Units of fractional undivided interest in and ownership
of the Trust (hereinafter referred to as the "Units"), created under said Trust
Agreement.

         In connection therewith we have examined such pertinent records and
documents and matters of law as we have deemed necessary in order to enable us
to express the opinions hereinafter set forth.

         Based upon the foregoing, we are of the opinion that:

               1. The execution and delivery of the Trust Agreement and the
          execution and issuance of certificates evidencing the Units in the
          Trust have been duly authorized; and

               2. The certificates evidencing the Units in the Trust, when duly
          executed and delivered by the Depositor and the Trustee in accordance
          with the aforementioned Trust Agreement, will constitute valid and
          binding obligations of such Trust and the Depositor in accordance with
          the terms thereof.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 333-89027) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

                                                         Respectfully submitted,

                                                              CHAPMAN AND CUTLER







                                                                     EXHIBIT 3.2

                               CHAPMAN AND CUTLER
                             111 WEST MONROE STREET
                             CHICAGO, ILLINOIS 60603

November 23, 1999


Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181

The Bank of New York
101 Barclay Street
New York, New York  10286


Re:  Van Kampen Focus Portfolios, Series 189
     ---------------------------------------

Gentlemen:

         We have acted as counsel for Van Kampen Funds Inc., Depositor of Van
Kampen Focus Portfolios, Series 189 (the "Fund"), in connection with the
issuance of Units of fractional undivided interest in the Fund, under a Trust
Agreement dated November 23, 1999 (the "Indenture") among Van Kampen Funds Inc.,
as Depositor, American Portfolio Evaluation Services, a division of Van Kampen
Investment Advisory Corp., as Evaluator, Van Kampen Investment Advisory Corp.,
as Supervisory Servicer, and The Bank of New York, as Trustee. The Fund is
comprised of the following separate unit investment trusts, The Roaring 2000ssm
Trust, Series 4A and The Roaring 2000ssm Trust, Series 4B (each a "Trust").

         In this connection, we have examined the Registration Statement, the
Prospectus, the Indenture, and such other instruments and documents as we have
deemed pertinent.

         The assets of the Trust will consist of a portfolio of equity
securities (the "Equity Securities") as set forth in the Prospectus. For
purposes of this opinion, it is assumed that each Equity Security is equity for
federal income tax purposes.

         Based upon the foregoing and upon an investigation of such matters of
law as we consider to be applicable, we are of the opinion that, under existing
United States Federal income tax law:

                   (i) The Trust is not an association taxable as a corporation
         for Federal income tax purposes but will be governed by the provisions
         of subchapter J (relating to Trusts) of chapter 1, Internal Revenue
         Code of 1986 (the "Code").

                  (ii) A Unitholder will be considered as owning a pro rata
         share of each asset of the Trust in the proportion that the number of
         Units held by him bears to the total number of Units outstanding. Under
         subpart E, subchapter J of chapter 1 of the Code, income of the Trust
         will be treated as income of each Unitholder in the proportion
         described, and an item of Trust income will have the same character in
         the hands of a Unitholder as it would have in the hands of the Trustee.
         Each Unitholder will be considered to have received his pro rata share
         of income derived from each Trust asset when such income is considered
         to be received by the Trust. A Unitholder's pro rata portion of
         distributions of cash or property by a corporation with respect to an
         Equity Security ("dividends" as defined by Section 316 of the Code )
         are taxable as ordinary income to the extent of such corporation's
         current and accumulated "earnings and profits." A Unitholder's pro rata
         portion of dividends which exceed such current and accumulated earnings
         and profits will first reduce the Unitholder's tax basis in such Equity
         Security, and to the extent that such dividends exceed a Unitholder's
         tax basis in such Equity Security, shall be treated as gain from the
         sale or exchange of property.

                 (iii) The price a Unitholder pays for his Units, generally
         including sales charges, is allocated among his pro rata portion of
         each Equity Security held by Trust (in proportion to the fair market
         values thereof on the valuation date closest to the date the Unitholder
         purchases his Units), in order to determine his tax basis for his pro
         rata portion of each Equity Security held by the Trust.

                  (iv) Gain or loss will be recognized to a Unitholder (subject
         to various nonrecognition provisions under the Code) upon redemption or
         sale of his Units, except to the extent an in kind distribution of
         stock is received by such Unitholder from the Trust as discussed below.
         Such gain or loss is measured by comparing the proceeds of such
         redemption or sale with the adjusted basis of his Units. Before
         adjustment, such basis would normally be cost if the Unitholder had
         acquired his Units by purchase. Such basis will be reduced, but not
         below zero, by the Unitholder's pro rata portion of dividends with
         respect to each Equity Security which are not taxable as ordinary
         income.

                   (v) If the Trustee disposes of a Trust asset (whether by
         sale, exchange, liquidation, redemption, payment on maturity or
         otherwise) gain or loss will be recognized to the Unitholder (subject
         to various nonrecognition provisions under the Code) and the amount
         thereof will be measured by comparing the Unitholder's aliquot share of
         the total proceeds from the transaction with his basis for his
         fractional interest in the asset disposed of. Such basis is ascertained
         by apportioning the tax basis for his Units (as of the date on which
         his Units were acquired) among each of the Trust assets (as of the date
         on which his Units were acquired) ratably according to their values as
         of the valuation date nearest the date on which he purchased such
         Units. A Unitholder's basis in his Units and of his fractional interest
         in each Trust asset must be reduced, but not below zero, by the
         Unitholder's pro rata portion of dividends with respect to the Equity
         Security which is not taxable as ordinary income.

                  (vi) Under the Indenture, under certain circumstances, a
         Unitholder tendering Units for redemption may request an in kind
         distribution of Equity Securities upon the redemption of Units or upon
         the termination of the Trust. As previously discussed, prior to the
         redemption of Units or the termination of the Trust, a Unitholder is
         considered as owning a pro rata portion of each of the Trust's assets.
         The receipt of an in kind distribution will result in a Unitholder
         receiving an undivided interest in whole shares of stock and possibly
         cash. The potential federal income tax consequences which may occur
         under an in kind distribution with respect to each Equity Security
         owned by the Trust will depend upon whether or not a Unitholder
         receives cash in addition to Equity Securities. An "Equity Security"
         for this purpose is a particular class of stock issued by a particular
         corporation. A Unitholder will not recognize gain or loss if a
         Unitholder only receives Equity Securities in exchange for his or her
         pro rata portion in the Equity Securities held by the Trust. However,
         if a Unitholder also receives cash in exchange for a fractional share
         of an Equity Security held by the Trust, such Unitholder will generally
         recognize gain or loss based upon the difference between the amount of
         cash received by the Unitholder and his tax basis in such fractional
         share of an Equity Security held by the Trust. The total amount of
         taxable gains (or losses) recognized upon such redemption will
         generally equal the sum of the gain (or loss) recognized under the
         rules described above by the redeeming Unitholder with respect to each
         Equity Security owned by the Trust.

         A domestic corporation owning Units in the Trust may be eligible for
the 70% dividends received deduction pursuant to Section 243(a) of the Code with
respect to such Unitholder's pro rata portion of dividends received by the Trust
(to the extent such dividends are taxable as ordinary income and are
attributable to domestic corporations), subject to the limitations imposed by
Sections 246 and 246A of the Code.

         To the extent dividends received by the Trust are attributable to
foreign corporations, a corporation that owns Units will not be entitled to the
dividends received deduction with respect to its pro rata portion of such
dividends since the dividends received deduction is generally available only
with respect to dividends paid by domestic corporations.

         Section 67 of the Code provides that certain itemized deductions, such
as investment expenses, tax return preparation fees and employee business
expenses will be deductible by individuals only to the extent they exceed 2% of
such individual's adjusted gross income. Unitholders may be required to treat
some or all of the expenses of the Trust as miscellaneous itemized deductions
subject to this limitation.

         A Unitholder will recognize taxable gain (or loss) when all or part of
his pro rata interest in an Equity Security is either sold by the Trust or
redeemed or when a Unitholder disposes of his Units in a taxable transaction, in
each case for an amount greater (or less) than his tax basis therefor, subject
to various non-recognition provisions of the Code.

         It should be noted that payments to the Trust of dividends on Equity
Securities that are attributable to foreign corporations may be subject to
foreign withholding taxes and Unitholders should consult their tax advisers
regarding the potential tax consequences relating to the payment of any such
withholding taxes by the Trust. Any dividends withheld as a result thereof will
nevertheless be treated as income to the Unitholders. Because under the grantor
trust rules, an investor is deemed to have paid directly his share of foreign
taxes that have been paid or accrued, if any, an investor may be entitled to a
foreign tax credit or deduction for United States tax purposes with respect to
such taxes. A required holding period is imposed for such credits.

         Any gain or loss recognized on a sale or exchange will, under current
law, generally be capital gain or loss.

         The scope of this opinion is expressly limited to the matters set forth
herein, and, except as expressly set forth above, we express no opinion with
respect to any other taxes, including foreign, state or local taxes or
collateral tax consequences with respect to the purchase, ownership and
disposition of Units.

                                                                Very truly yours

                                                              CHAPMAN AND CUTLER







                                                                     EXHIBIT 3.3

                                WINSTON & STRAWN
                                 200 Park Avenue
                          New York, New York 10166-4193

November 23, 1999


Van Kampen Focus Portfolios, Series 189
c/o The Bank of New York, As Trustee
101 Barclay Street, 17 West
New York, New York  10286

Dear Sirs:

         We have acted as special counsel for the Van Kampen Focus Portfolios,
Series 189 (the "Fund") consisting of The Roaring 2000s Trust, Series 4A and The
Roaring 2000s Trust, Series 4B (individually a "Trust" and, in the aggregate,
the "Trusts") for purposes of determining the applicability of certain New York
taxes under the circumstances hereinafter described.

         The Fund is created pursuant to a Trust Agreement (the "Indenture"),
dated as of today (the "Date of Deposit") among Van Kampen Funds Inc. (the
"Depositor"), American Portfolio Evaluation Services, a division of an affiliate
of the Depositor, as Evaluator, Van Kampen Investment Advisory Corp., an
affiliate of the Depositor, as Supervisory Servicer (the "Supervisory
Servicer"), and The Bank of New York, as trustee (the "Trustee"). As described
in the prospectus relating to the Fund dated today to be filed as an amendment
to a registration statement heretofore filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended (respectively the
"Prospectus" and the "Regulation Statement") (File Number 333-89027), the
objectives of the Fund are to provide the potential for dividend income and
capital appreciation through investment in a fixed portfolio of actively traded
equity securities of companies engaged in, providing services to companies in,
the industry identified in Trust's name, or are the type of securities
identified in the name of the Trusts. It is noted that no opinion is expressed
herein with regard to the Federal tax aspects of the securities, the Trusts,
units of the Trusts (the "Units"), or any income, gains or losses in respect
thereof.

         As more fully set forth in the Indenture and in the Prospectus, the
activities of the Trustee will include the following:

         On the Date of Deposit, the Depositor will deposit with the Trustee
with respect to the Trust the securities and/or contracts and cash for the
purchase thereof together with an irrevocable letter of credit in the amount
required for the purchase price of the securities comprising the corpus of the
Trust as more fully set forth in the Prospectus.

         The Trustee did not participate in the selection of the securities to
be deposited in the Trust, and, upon the receipt thereof, will deliver to the
Depositor a registered certificate for the number of Units representing the
entire capital of the Trusts as more fully set forth in the Prospectus. The
Units, which are represented by certificates ("Certificates"), will be offered
to the public upon the effectiveness of the registration statement.

         The duties of the Trustee, which are ministerial in nature, will
consist primarily of crediting the appropriate accounts with cash dividends
received by the Fund and with the proceeds from the disposition of securities
held in the Fund and the proceeds of the treasury obligation on maturity and the
distribution of such cash dividends and proceeds to the Unit holders. The
Trustee will also maintain records of the registered holders of Certificates
representing an interest in the Fund and administer the redemption of Units by
such Certificate holders and may perform certain administrative functions with
respect to an automatic reinvestment option.

         Generally, equity securities held in the Trust may be removed therefrom
by the Trustee at the direction of the Depositor upon the occurrence of certain
specified events which adversely affect the sound investment character of the
Fund, such as default by the issuer in payment of declared dividends or of
interest or principal on one or more of its debt obligations.

         Prior to the termination of the Fund, the Trustee is empowered to sell
equity securities designated by the Supervisory Servicer only for the purpose of
redeeming Units tendered to it and of paying expenses for which funds are not
available. The Trustee does not have the power to vary the investment of any
Unit holder in the Fund, and under no circumstances may the proceeds of sale of
any equity securities held by the Fund be used to purchase new equity securities
to be held therein.

         Article 9-A of the New York Tax Law imposes a franchise tax on business
corporations, and, for purposes of that Article, Section 208(l) defines the term
"corporation" to include, among other things, "any business conducted by a
trustee or trustees wherein interest or ownership is evidenced by certificate or
other written instrument."

         The Regulations promulgated under Section 208 provide as follows:

                  A business conducted by a trustee or trustees in which
                  interest or ownership is evidenced by certificate or other
                  written instrument includes, but is not limited to, an
                  association commonly referred to as a "business trust" or
                  "Massachusetts trust". In determining whether a trustee or
                  trustees are conducting a business, the form of the agreement
                  is of significance but is not controlling. The actual
                  activities of the trustee or trustees, not their purposes and
                  powers, will be regarded as decisive factors in determining
                  whether a trust is subject to tax under Article 9-A. The mere
                  investment of funds and the collection of income therefrom,
                  with incidental replacement of securities and reinvestment of
                  funds, does not constitute the conduct of a business in the
                  case of a business conducted by a trustee or trustees. 20
                  NYCRR 1-2.5(b)(2) (July 11, 1990).

         New York cases dealing with the question of whether a trust will be
subject to the franchise tax have also delineated the general rule that where a
trustee merely invests funds and collects and distributes the income therefrom,
the trust is not engaged in business and is not subject to the franchise tax.
Burrell v. Lynch, 274 A.D. 347, 84 N.Y.S.2d 171 (3rd Dept. 1948), order
resettled, 274 A.D. 1083, 85 N.Y.S.2d 705 (3rd Dept. 1949).

         In an Opinion of the Attorney General of the State of New York, 47 N.Y.
Att'y. Gen. Rep. 213 (Nov. 24, 1942), it was held that where the trustee of an
unincorporated investment trust was without authority to reinvest amounts
received upon the sales of securities and could dispose of securities making up
the trust only upon the happening of certain specified events or the existence
of certain specified conditions, the trust was not subject to the franchise tax.

         In the instant situation, the Trustee is not empowered to, and we
assume will not, sell equity securities contained in the corpus of the Fund and
reinvest the proceeds therefrom. Further, the power to sell such equity
securities is limited to circumstances in which the credit-worthiness or
soundness of the issuer of such equity security is in question or in which cash
is needed to pay redeeming Unit holders or to pay expenses, or where the Fund is
liquidated subsequent to the termination of the Indenture. In substance, the
Trustee will merely collect and distribute income and will not reinvest any
income or proceeds, and the Trustee has no power to vary the investment of any
Unit holder in the Fund.

         Under Subpart E of Part I, Subchapter J of Chapter 1 of the Internal
Revenue Code of 1986, as amended (the "Code"), the grantor of a trust will be
deemed to be the owner of the trust under certain circumstances, and therefore
taxable on his proportionate interest in the income thereof. Where this Federal
tax rule applies, the income attributed to the grantor will also be income to
him for New York income tax purposes. See TSB-M-78(9)(c), New York Department of
Taxation and Finance, June 23, 1978.

         By letter dated today, Messrs. Chapman and Cutler, counsel for the
Depositor, rendered their opinion that each Unit holder will be considered as
owning a share of each asset of the Trust in the proportion that the number of
Units held by such holder bears to the total number of Units outstanding and the
income of a Trust will be treated as the income of each Unit holder in said
proportion pursuant to Subpart E of Part I, Subchapter J of Chapter 1 of the
Code.

         Based on the foregoing and on the opinion of Messrs. Chapman and
Cutler, counsel for the Depositor, dated today, upon which we specifically rely,
we are of the opinion that under existing laws, rulings, and court decisions
interpreting the laws of the State and City of New York:

               1. Each of the Trusts will not constitute an association taxable
          as a corporation under New York law, and, accordingly, will not be
          subject to tax on its income under the New York State franchise tax or
          the New York City general corporation tax.

               2. The income of the Trusts will be treated as the income of the
          Unit holders under the income tax laws of the State and City of New
          York.

               3. Unit holders who are not residents of the State of New York
          are not subject to the income tax laws thereof with respect to any
          interest or gain derived from the Fund or any gain from the sale or
          other disposition of the Units, except to the extent that such
          interest or gain is from property employed in a business, trade,
          profession or occupation carried on in the State of New York.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement relating to the Units and to the use of our name and the
reference to our firm in the Registration Statement and in the Prospectus.

                                                               Very truly yours,

                                                                WINSTON & STRAWN







                                                                     EXHIBIT 4.1

                                Interactive Data
                           FINANCIAL TIMES Information
             100 William Street, 15th Floor, New York, NY 10038 USA
                    Tel: (212) 269-6300 Fax: (212) 771-6445


November 22, 1999


Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, IL 60181


Re:  Van Kampen Focus Portfolios The Roaring 2000sSM Trust, Series 4A The
     Roaring 2000sSM Trust, Series 4B (A Unit Investment Trust) Registered Under
     the Securities Act of 1933, File No. 333-89027


  Gentlemen:

         We have examined the Registration Statement for the above captioned
Fund, a copy of which is attached hereto.

         We hereby consent to the reference in the Prospectus and Registration
Statement for the above captioned Fund to Interactive Data Corporation, as the
Evaluator, and to the use of the Obligations prepared by us which are referred
to in such Prospectus and Statement.

         You are authorized to file copies of this letter with the Securities
and Exchange Commission.

Very truly yours,


Steve Miano
Director Fixed Income Data Operations








                                                                     EXHIBIT 4.2


                INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS' CONSENT

         We have issued our report dated November 23, 1999 on the statements of
condition and related securities portfolios of Van Kampen Focus Portfolios,
Series 189 as of November 23, 1999 contained in the Registration Statement on
Form S-6 and Prospectus. We consent to the use of our report in the Registration
Statement and Prospectus and to the use of our name as it appears under the
caption "Other Matters-Independent Certified Public Accountants."



                                                              Grant Thornton LLP

Chicago, Illinois
November 23, 1999







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