GLENBROOK LIFE & ANNUITY CO
424B3, 2000-06-22
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                AIM LIFETIME ENHANCED CHOICE(SM) VARIABLE ANNUITY

Glenbrook Life and Annuity Company                 Prospectus dated June 9, 2000
Post Office Box 94039
Palatine, IL 60094-4039
Telephone Number: 1-800-776-6978

Glenbrook Life and Annuity  Company  ("Glenbrook")  is offering the AIM Lifetime
Enhanced  Choice(SM)  Variable Annuity, an individual and group flexible premium
deferred  variable  annuity  contract  ("Contract").  This  prospectus  contains
information  about the Contract  that you should know before  investing.  Please
keep it for future reference.

The  Contract   currently   offers  19  investment   alternatives   ("investment
alternatives").  The  investment  alternatives  include 2 fixed account  options
("Fixed  Account  Options")  and  17  variable   sub-accounts   ("Variable  Sub-
Accounts")  of the  Glenbrook  Life  and  Annuity  Company  Separate  Account  A
("Variable Account"). Each Variable Sub-Account invests exclusively in shares of
one of the following funds ("Funds") of AIM Variable Insurance Funds.
<TABLE>
<CAPTION>

  <S>                                        <C>
  . AIM V.I. Aggressive Growth Fund          . AIM V.I. Global Utilities Fund
  . AIM V.I. Balanced Fund                   . AIM V.I. Government Securities Fund
  . AIM V.I. Blue Chip Fund                  . AIM V.I. Growth Fund
  . AIM V.I. Capital Appreciation Fund       . AIM V.I. Growth and Income Fund
  . AIM V.I. Capital Development Fund        . AIM V.I. High Yield Fund
  . AIM V.I. Dent Demographic Trends Fund    . AIM V.I. International Equity Fund
  . AIM V.I. Diversified Income Fund         . AIM V.I. Money Market Fund
  . AIM V.I. Global Growth and Income Fund   . AIM V.I. Telecommunications and Technology Fund*
                              . AIM V.I. Value Fund
</TABLE>

*Effective   May  1,   2000,   the  Fund   changed   its  name   from  AIM  V.I.
Telecommunications  Fund to AIM V.I.  Telecommunications  and Technology Fund to
reflect changes in its investment policies.  We have made a corresponding change
in the name of the Variable Sub-Account that invests in that Fund.

Each  time you make a  purchase  payment,  we will  add to your  Contract  value
("Contract Value") a credit enhancement  ("Credit  Enhancement").  There are two
Credit   Enhancement   options  available  under  the  Contract.   Under  Credit
Enhancement  option 1, we will add to your Contract  Value a Credit  Enhancement
equal to 4% of your purchase  payments  ("Credit  Enhancement  Option 1"). Under
Credit  Enhancement  option  2, we  will  add to your  Contract  Value a  Credit
Enhancement equal to 2% of your purchase payments  ("Credit  Enhancement  Option
2"). In  addition,  under  Credit  Enhancement  Option 2, on every 5th  Contract
anniversary ("Contract  Anniversary") during the Accumulation Phase, we will add
to your Contract Value a Credit  Enhancement  equal to 2% of your Contract Value
as of such Contract Anniversary. Expenses for this Contract may be higher than a
contract  without the Credit  Enhancement.  Over time,  the amount of the Credit
Enhancement  may be more than  offset  by the fees  associated  with the  Credit
Enhancement.

We ("Glenbrook") have filed a Statement of Additional Information, dated June 9,
2000,  with the Securities  and Exchange  Commission  ("SEC").  It contains more
information  about the Contract and is incorporated  herein by reference,  which
means it is legally a part of this prospectus.  Its table of contents appears on
page 48 of this  prospectus.  For a free  copy,  please  write or call us at the
address   or   telephone   number   above,   or  go  to  the   SEC's   Web  site
(http://www.sec.gov).  You can find other  information  and documents  about us,
including  documents that are legally part of this prospectus,  at the SEC's Web
site.

                                        1
<PAGE>

                  The  Securities  and Exchange  Commission  has not approved or
                  disapproved the securities  described in this prospectus,  nor
                  has  it  passed  on  the  accuracy  or the  adequacy  of  this
                  prospectus.  Anyone who tells you  otherwise  is  committing a
                  federal crime.

  IMPORTANT
   NOTICES

                  The Contracts may be distributed  through  broker-dealers that
                  have relationships with banks or other financial  institutions
                  or by employees of such banks.  However, the Contracts are not
                  deposits,   or   obligations   of,  or   guaranteed   by  such
                  institutions or any federal regulatory  agency.  Investment in
                  the Contracts  involves  investment risks,  including possible
                  loss of principal.

                  The Contracts are not FDIC insured.

                                        2
<PAGE>

TABLE OF CONTENTS
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
             <S>                                                            <C>
             Important Terms...............................................   4
             The Contract at a Glance......................................   5
             How the Contract Works........................................   7
             Expense Table.................................................   8
             Financial Information.........................................  11

   Overview

             The Contract..................................................  12
             Purchases.....................................................  14
             Contract Value................................................  16
             Investment Alternatives:
               The Variable Sub-Accounts...................................  17
               The Fixed Account Options...................................  18
               Transfers...................................................  21
             Expenses......................................................  24
             Access To Your Money..........................................  27
             Income Payments...............................................  29
             Death Benefits................................................  32

   Contract
   Features

             More Information:
               Glenbrook...................................................  35
               The Variable Account........................................  35
               The Funds...................................................  36
               The Contract................................................  36
               Qualified Plans.............................................  37
               Legal Matters...............................................  37
               Year 2000...................................................  37
             Taxes.........................................................  39
             Annual Reports and Other Documents............................  43
             Performance Information.......................................  44
             Experts.......................................................  45
             Appendix A--Market Value Adjustment Examples..................  46
             Statement of Additional Information Table of Contents.........  48

    Other
 Information
</TABLE>

                                        3
<PAGE>

IMPORTANT TERMS
--------------------------------------------------------------------------------

This  prospectus  uses a number of important  terms that you may not be familiar
with.  The index below  identifies  the page that describes each term. The first
use of each term in this prospectus appears in highlights.

<TABLE>
<CAPTION>
                                                                            Page
                                                                           -----
   <S>                                                                     <C>
   Accumulation Phase.....................................................     7
   Accumulation Unit...................................................... 11,16
   Accumulation Unit Value................................................ 11,16
   Annuitant..............................................................    12
   Automatic Additions Program............................................    14
   Automatic Fund Rebalancing Program.....................................    22
   Beneficiary............................................................    12
   Cancellation Period....................................................     5
   *Contract..............................................................    12
   Contract Anniversary...................................................     6
   Contract Owner ("You").................................................    12
   Contract Value.........................................................    16
   Contract Year..........................................................     6
   Credit Enhancement..................................................... 14-15
   Death Benefit Anniversary..............................................    32
   Dollar Cost Averaging Program..........................................    22
   Due Proof of Death.....................................................    32
   Enhanced Death Benefit Rider........................................... 32-33
   Fixed Account Options..................................................    18
   Free Withdrawal Amount.................................................    25
   Funds..................................................................  1,17
   Glenbrook ("We").......................................................     1
   Guarantee Periods......................................................    18
   Income Plan............................................................    29
   Investment Alternatives................................................  1,17
   Issue Date.............................................................     7
   Market Value Adjustment................................................    20
   Payout Phase...........................................................     7
   Payout Start Date......................................................    29
   Qualified Contract.....................................................    37
   Right to Cancel........................................................    15
   SEC....................................................................     1
   Settlement Value.......................................................    32
   Systematic Withdrawal Program..........................................    27
   Treasury Rate..........................................................    20
   Valuation Date.........................................................    14
   Variable Account....................................................... 35-36
   Variable Sub-Account...................................................    17
</TABLE>
----------------

*If you  purchase  a  group  Contract,  we will  issue  you a  certificate  that
represents  your  ownership  and that  summarizes  the  provisions  of the group
Contract.  References  to "Contract" in this  prospectus  include  certificates,
unless the  context  requires  otherwise.  In certain  states,  the  Contract is
available only as a group Contract.

                                        4
<PAGE>

THE CONTRACT AT A GLANCE
--------------------------------------------------------------------------------

The following is a snapshot of the  Contract.  Please read the remainder of this
prospectus for more information.

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

 Flexible Payments          You can purchase a Contract with as little as
                            $10,000. You can add to your Contract as often
                            and as much as you like, but each payment must
                            be at least $500 ($100 for automatic purchase
                            payments to the variable investment options).
                            You must maintain a minimum account size of
                            $1,000.

                            Each time you make a purchase payment, if you choose
                            Credit  Enhancement  Option  1, we will  add to your
                            Contract   Value   ("Contract   Value")   a   Credit
                            Enhancement equal to 4% of such purchase payment (2%
                            if you choose Credit Enhancement Option 2).

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

 Right to Cancel            You may cancel your Contract within 20 days of
                            receipt or any longer period as your state may
                            require ("Cancellation Period"). Upon
                            cancellation we will return your purchase
                            payments adjusted, to the extent applicable law
                            permits, to reflect the investment experience
                            of any amounts allocated to the Variable
                            Account. If you exercise your Right to Cancel
                            the Contract, the amount we refund to you will
                            not include any Credit Enhancement. See "Right
                            to Cancel" for details.

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

 Expenses                   You will bear the following expenses:

                            . Total Variable  Account annual fees equal to 1.50%
                              of average  daily net assets  (1.70% if you select
                              the Enhanced Death Benefit Rider)
                            . Annual contract maintenance charge of $35
                              (with certain exceptions)
                            . Withdrawal  charges  ranging  from  0%  to  8%  of
                              purchase   payments    withdrawn   (with   certain
                              exceptions)
                            . Transfer fee of $10 after 12th transfer in
                              any Contract Year (fee currently waived)
                            . State premium tax (if your state imposes one)

                            In addition,  each Fund pays  expenses that you will
                            bear  indirectly  if you invest in a  Variable  Sub-
                            Account.

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

 Investment Alternatives    The  Contract  offers  19  investment
                            alternatives including:

                            . 2 Fixed Account Options (which credit
                              interest at rates we guarantee)
                            . 17  Variable   Sub-Accounts   investing  in  Funds
                              offering  professional  money  management by A I M
                              Advisors, Inc.

                            To find out  current  rates  being paid on the Fixed
                            Account  Options,  or to find  out how the  Variable
                            Sub-Accounts  have  performed,  please call us at 1-
                            800-776-6978.

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

                                        5
<PAGE>

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

 Special Services           For  your  convenience,   we  offer  these
                            special services:

                            .Automatic Fund Rebalancing Program
                            .Automatic Additions Program
                            .Dollar Cost Averaging Program
                            .Systematic Withdrawal Program

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

 Income Payments            You  can  choose  fixed  income  payments,
                            variable  income  payments,  or a combination of the
                            two. You can receive your income  payments in one of
                            the following ways:

                            . life income with guaranteed payments
                            . a joint and survivor life income with
                               guaranteed payments
                            . guaranteed payments for a specified period (5
                              to 30 years)

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

 Death Benefits             If you die before the Payout Start Date, we
                            will  pay  the  death   benefit   described  in  the
                            Contract.  We also offer an Enhanced  Death  Benefit
                            Rider.

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

 Transfers                  Before the Payout Start Date,  you may transfer your
                            Contract   value   ("Contract   Value")   among  the
                            investment alternatives,  with certain restrictions.
                            No minimum applies to the amount you transfer.

                            We do not  currently  impose a fee  upon  transfers.
                            However,  we  reserve  the right to  charge  $10 per
                            transfer  after the 12th transfer in each  "Contract
                            Year,"  which we measure from the date we issue your
                            contract or a Contract Anniversary.

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

 Withdrawals                You may withdraw some or all of your Contract
                            Value at any time prior to the date income
                            payments begin, and, under limited circumstances,
                            during the Payout Phase. In general, you must
                            withdraw at least $50 at a time. A 10% federal tax
                            penalty may apply if you withdraw before you are
                            59 1/2 years old. A withdrawal charge and Market
                            Value Adjustment also may apply.

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

                                        6
<PAGE>

HOW THE CONTRACT WORKS
--------------------------------------------------------------------------------

The Contract basically works in two ways.

First, the Contract can help you (we assume you are the Contract owner) save for
retirement because you can invest in up to 19 investment alternatives and pay no
federal income taxes on any earnings until you withdraw them. You do this during
what we call the "Accumulation  Phase" of the Contract.  The Accumulation  Phase
begins on the date we issue your  Contract (we call that date the "Issue  Date")
and continues until the Payout Start Date, which is the date we apply your money
to provide income payments. During the Accumulation Phase, you may allocate your
purchase  payments to any combination of the Variable Sub- Accounts and/or Fixed
Account  Options.  If you invest in the Fixed Account  Options,  you will earn a
fixed rate of interest that we declare periodically. If you invest in any of the
Variable Sub-Accounts,  your investment return will vary up or down depending on
the performance of the corresponding Funds.

Second,  the Contract can help you plan for retirement because you can use it to
receive  retirement  income for life  and/or for a pre-set  number of years,  by
selecting  one of the income  payment  options  (we call these  "Income  Plans")
described  on page 29.  You  receive  income  payments  during  what we call the
"Payout  Phase" of the  Contract,  which  begins on the  Payout  Start  Date and
continues until we make the last payment required by the Income Plan you select.
During the  Payout  Phase,  if you  select a fixed  income  payment  option,  we
guarantee the amount of your payments,  which will remain fixed. If you select a
variable  income  payment  option,   based  on  one  or  more  of  the  Variable
Sub-Accounts,  the amount of your payments will vary up or down depending on the
performance of the corresponding Funds. The amount of money you accumulate under
your  Contract  during the  Accumulation  Phase and apply to an Income Plan will
determine the amount of your income payments during the Payout Phase.

The timeline below illustrates how you might use your Contract.


<TABLE>
<CAPTION>
<S>                <C>                               <C>                <C>                 <C>             <C>
Issue                                                Payout Start
Date               Accumulation Phase                    Date          Payout Phase
-------------------------------------------------------------------------------------------------------------------- >
|                                                         |                                |
                   You save for retirement

You buy                                          You elect to receive                  You can receive      Or you can
a Contract                                       income payments or receive            income payments      receive income
                                                 a lump sum payment                    for a set period     payments for life
</TABLE>


As the Contract owner, you exercise all of the rights and privileges provided by
the Contract. If you die, any surviving Contract owner, or if there is none, the
Beneficiary  will exercise the rights and  privileges  provided by the Contract.
See "The  Contract."  In addition,  if you die before the Payout Start Date,  we
will pay a death benefit to any surviving  Contract  owner, or if there is none,
to your Beneficiary. See "Death Benefits."

Please call us at 1-800-776-6978 if you have any question about how the Contract
works.

                                        7
<PAGE>

EXPENSE TABLE
--------------------------------------------------------------------------------

The table below lists the  expenses  that you will bear  directly or  indirectly
when you buy a Contract.  The table and the examples  that follow do not reflect
premium taxes imposed by the state where you reside.  For more information about
Variable Account expenses, see "Expenses" below. For more information about Fund
expenses, please refer to the accompanying fund prospectus.

CONTRACT OWNER TRANSACTION EXPENSES

Withdrawal Charge (as a percentage of purchase payments)*

Number of Complete Years Since We Received the Purchase


   Payment Being Withdrawn:                  0   1   2   3   4   5   6   7   8
   Applicable Charge:.....................  8%  8%  7%  7%  6%  5%  4%  3%  0%



   Annual Contract Maintenance Charge..........  $35.00**
   Transfer Fee................................  $10.00***

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

  * Each Contract  Year,  you may withdraw up to 15% of the Contract Value as of
    the  beginning of the  Contract  Year (15% of the initial  purchase  payment
    during the first  Contract  Year) without  incurring a withdrawal  charge or
    Market Value Adjustment. See "Free Withdrawal Amount" for details.

 ** We will waive this charge in certain cases. See "Expenses."

*** Applies solely to the thirteenth and subsequent  transfers within a Contract
    Year,  excluding  transfers due to dollar cost  averaging and automatic fund
    rebalancing. We are currently waiving the transfer fee.

                        VARIABLE ACCOUNT ANNUAL EXPENSES
 (as a percentage of average daily net asset value deducted from each Variable
                                  Sub-Account)


   Mortality and Expense Risk Charge..................................... 1.40%*
   Administrative Expense Charge......................................... 0.10%
   Total Variable Account Annual Expenses................................ 1.50%

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

*  If you select the Enhanced  Death  Benefit  Rider,  the mortality and expense
   risk  charge  will be equal to 1.60% of your  Contract's  average  daily  net
   assets in the Variable Account.

                                        8
<PAGE>

                              FUND ANNUAL EXPENSES
                (After Voluntary Reductions and Reimbursements)
             (as a percentage of Fund average daily net assets)(1)


                                              Management  Other   Total Annual
Fund                                             Fee     Expenses Fund Expenses
----                                          ---------- -------- -------------
AIM V.I. Aggressive Growth Fund (2)..........   0.00%     1.19%       1.19%
AIM V.I. Balanced Fund (2)...................   0.65%     0.56%       1.21%
AIM V.I. Blue Chip Fund......................   0.75%     0.55%       1.30%
AIM V.I. Capital Appreciation Fund...........   0.62%     0.11%       0.73%
AIM V.I. Capital Development Fund (2)........   0.00%     1.23%       1.23%
AIM V.I. Dent Demographic Trends Fund........   0.85%     0.55%       1.40%
AIM V.I. Diversified Income Fund.............   0.60%     0.23%       0.83%
AIM V.I. Global Growth and Income Fund (2)...   0.97%     0.37%       1.34%
AIM V.I. Global Utilities Fund...............   0.65%     0.49%       1.14%
AIM V.I. Government Securities Fund..........   0.50%     0.40%       0.90%
AIM V.I. Growth Fund.........................   0.63%     0.10%       0.73%
AIM V.I. Growth and Income Fund..............   0.61%     0.16%       0.77%
AIM V.I. High Yield Fund (2).................   0.35%     0.79%       1.14%
AIM V.I. International Equity Fund...........   0.75%     0.22%       0.97%
AIM V.I. Money Market Fund...................   0.40%     0.20%       0.60%
AIM V.I. Telecommunications and Technology
 Fund........................................   1.00%     0.27%       1.27%
AIM V.I. Value Fund..........................   0.61%     0.15%       0.76%

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

(1) Figures shown in the table are for the year ended December 31, 1999,  except
    for the AIM V.I.  Blue Chip,  Dent  Demographic  Trends,  Global  Growth and
    Income,  and   Telecommunications   and  Technology  Funds  which  commenced
    operations  on December  29, 1999,  December 29, 1999,  October 15, 1999 and
    October 15, 1999  respectively.  For these Funds,  the management fee, other
    expenses and total annual fund operating expenses are based on estimates for
    the Funds' first full fiscal year.

(2) Absent voluntary reductions and reimbursements for certain Funds, management
    fees,  other  expenses,  and  total  annual  fund  expenses  expressed  as a
    percentage of average net assets of the Funds would have been as follows:


                                              Management  Other   Total Annual
Fund                                             Fee     Expenses Fund Expenses
----                                          ---------- -------- -------------
AIM V.I. Aggressive Growth Fund............   0.80%     1.62%       2.42%
AIM V.I. Balanced Fund.....................   0.75%     0.56%       1.31%
AIM V.I. Capital Development Fund..........   0.75%     2.67%       3.42%
AIM V.I. Global Growth and Income Fund.....   1.00%     0.37%       1.37%
AIM V.I. High Yield Fund...................   0.63%     0.79%       1.42%


                                    EXAMPLE 1

The  example  below  shows the  dollar  amount of  expenses  that you would bear
directly or indirectly if you:

  . invested $1,000 in a Variable Sub-Account,

  . earned a 5% annual return on your investment, and

  . surrendered  your Contract,  or you began  receiving  income  payments for a
    specified period of less than 120 months, at the end of each time period.

  . elected the Enhanced Death Benefit Option

The example does not include any taxes or tax  penalties  you may be required to
pay if you surrender your Contract.

                                        9
<PAGE>


SUB-ACCOUNT                                      1 YEAR 3 YEARS 5 YEARS 10 YEARS
-----------                                      ------ ------- ------- --------
AIM V.I. Aggressive Growth......................  $111   $190    $270     $442
AIM V.I. Balanced...............................  $101   $159    $219     $341
AIM V.I. Blue Chip..............................  $101   $159    $218     $340
AIM V.I. Capital Appreciation...................  $ 95   $142    $191     $284
AIM V.I. Capital Development....................  $121   $218    $314     $523
AIM V.I. Dent Demographic Trends................  $102   $162    $224     $352
AIM V.I. Diversified Income.....................  $ 96   $145    $196     $294
AIM V.I. Global Growth and Income...............  $101   $161    $222     $347
AIM V.I. Global Utilities.......................  $ 99   $154    $211     $325
AIM V.I. Government Securities..................  $ 97   $147    $199     $301
AIM V.I. Growth.................................  $ 95   $142    $191     $284
AIM V.I. Growth and Income......................  $ 96   $143    $193     $288
AIM V.I. High Yield.............................  $102   $162    $224     $352
AIM V.I. International Equity...................  $ 97   $149    $203     $308
AIM V.I. Money Market...........................  $ 94   $138    $185     $271
AIM V.I. Telecommunications and Technology......  $100   $158    $217     $337
AIM V.I. Value..................................  $ 95   $143    $193     $287


                                    EXAMPLE 2

Same  assumptions  as Example 1 above,  except that you decided not to surrender
your Contract,  or you began receiving  income payments (for at least 120 months
if under an Income Plan for a specified period), at the end of each period.


SUB-ACCOUNT                                      1 YEAR 3 YEARS 5 YEARS 10 YEARS
-----------                                      ------ ------- ------- --------
AIM V.I. Aggressive Growth......................  $43    $129    $217     $442
AIM V.I. Balanced...............................  $31    $ 96    $163     $341
AIM V.I. Blue Chip..............................  $31    $ 96    $162     $340
AIM V.I. Capital Appreciation...................  $25    $ 78    $134     $284
AIM V.I. Capital Development....................  $53    $159    $264     $523
AIM V.I. Dent Demographic Trends................  $32    $ 99    $168     $352
AIM V.I. Diversified Income.....................  $26    $ 81    $139     $294
AIM V.I. Global Growth and Income...............  $32    $ 98    $166     $347
AIM V.I. Global Utilities.......................  $30    $ 91    $154     $325
AIM V.I. Government Securities..................  $27    $ 83    $142     $301
AIM V.I. Growth.................................  $25    $ 78    $134     $284
AIM V.I. Growth and Income......................  $26    $ 79    $136     $288
AIM V.I. High Yield.............................  $33    $ 99    $168     $352
AIM V.I. International Equity...................  $28    $ 86    $146     $308
AIM V.I. Money Market...........................  $24    $ 74    $127     $271
AIM V.I. Telecommunications and Technology......  $31    $ 95    $161     $337
AIM V.I. Value..................................  $26    $ 79    $135     $287


Please  remember  that you are looking at examples and not a  representation  of
past or future expenses. Your actual expenses may be lower or greater than those
shown  above.  Similarly,  your rate of return may be lower or greater  than 5%,
which is not guaranteed.  The above examples assume the election of the Enhanced
Death Benefit  Rider with a mortality and expense risk charge of 1.60%.  If that
option  were not  elected,  the  example  figures  shown above would be slightly
lower. To reflect the contract maintenance charge in the examples,  we estimated
an equivalent  percentage  charge,  based on an assumed average Contract size of
$50,000.

                                       10
<PAGE>

FINANCIAL INFORMATION
--------------------------------------------------------------------------------

To measure the value of your investment in the Variable  Sub-Accounts during the
Accumulation  Phase, we use a unit of measure we call the  "Accumulation  Unit."
Each Variable  Sub-Account  has a separate value for its  Accumulation  Units we
call "Accumulation Unit Value." Accumulation Unit Value is analogous to, but not
the same as, the share price of a mutual fund.

There are no Accumulation Unit Values to report because the Contracts were first
offered as of the date of this prospectus.

The  financial  statements of the Variable  Account and Glenbrook  appear in the
Statement of Additional Information.

                                       11
<PAGE>

THE CONTRACT
--------------------------------------------------------------------------------

CONTRACT OWNER

The AIM Lifetime Enhanced Choice(SM) Variable Annuity is a contract between you,
the Contract owner,  and Glenbrook,  a life insurance  company.  As the Contract
owner, you may exercise all of the rights and privileges  provided to you by the
Contract.  That  means  it is up to you to  select  or  change  (to  the  extent
permitted):

  . the investment alternatives during the Accumulation and Payout Phases,

  . the amount and timing of your purchase payments and withdrawals,

  . the programs you want to use to invest or withdraw money,

  . the income payment plan you want to use to receive retirement income,

  . the Annuitant (either yourself or someone else) on whose life the income
    payments will be based,

  . the  Beneficiary  or  Beneficiaries  who will receive the benefits  that the
    Contract provides when the last surviving Contract owner dies, and

  . any other rights that the Contract provides.

If you die,  any  surviving  Contract  owner or, if none,  the  Beneficiary  may
exercise the rights and privileges provided to them by the Contract.

The Contract cannot be jointly owned by both a non-natural  person and a natural
person.  The maximum age of either  owner,  or  annuitant if the owner is a non-
natural person, cannot exceed age 80 at the time the contract is purchased.

You can use the Contract with or without a qualified plan. A qualified plan is a
personal retirement savings plan, such as an IRA or tax-sheltered  annuity, that
meets the requirements of the Internal  Revenue Code.  Qualified plans may limit
or  modify  your  rights  and  privileges  under the  Contract.  We use the term
"Qualified  Contract" to refer to a Contract  issued with a qualified  plan. See
"Qualified Plans" on page 37.

ANNUITANT

The Annuitant is the  individual  whose age  determines  the latest Payout Start
Date and whose life determines the amount and duration of income payments (other
than under Income Plans with guaranteed  payments for a specified  period).  You
initially designate an Annuitant in your application. If the Contract owner is a
natural  person,  you may change the  Annuitant  prior to the Payout Start Date.
Prior to the Payout Start Date,  you may designate a joint  Annuitant,  who is a
second person on whose life income  payments depend under an Income Plan. In our
discretion, we may permit you to designate a joint Annuitant prior to the Payout
Start Date.

If the Annuitant dies prior to the Payout Start Date, the new Annuitant will be:

  . the youngest Contract owner if living, otherwise

  . the youngest Beneficiary.

BENEFICIARY

The  Beneficiary  is the person who may elect to  receive  the death  benefit or
become the new Contract owner if the sole  surviving  Contract owner dies before
the Payout  Start  Date.  If the sole  surviving  Contract  owner dies after the
Payout Start Date, the Beneficiary  will receive any guaranteed  income payments
scheduled to continue.

                                       12
<PAGE>

You may name one or more  Beneficiaries  when you apply for a Contract.  You may
change  or add  Beneficiaries  at any  time by  writing  to us  unless  you have
designated an irrevocable  Beneficiary.  We will provide a change of Beneficiary
form to be signed and filed with us. Any change  will be  effective  at the time
you sign the  written  notice,  whether or not the  Annuitant  is living when we
receive  the  notice.   Until  we  receive  your  written  notice  to  change  a
Beneficiary,  we are entitled to rely on the most recent Beneficiary information
in our files.  We will not be liable as to any payment or settlement  made prior
to  receiving  the  written  notice.  Accordingly,  if you wish to  change  your
Beneficiary, you should deliver your written notice to us promptly.

If you did not name a  Beneficiary  or if the  named  Beneficiary  is no  longer
living and there are no other surviving Beneficiaries,  the new Beneficiary will
be:

  . your spouse or, if he or she is no longer alive,

  . your surviving children equally, or if you have no surviving children,

  . your estate.

If more than one  Beneficiary  survives  you (or the  Annuitant  if the Contract
owner is not a natural  person),  we will  divide the death  benefit  among your
Beneficiaries  according to your most recent written  instructions.  If you have
not  given us  written  instructions,  we will pay the  death  benefit  in equal
amounts to the surviving Beneficiaries.

MODIFICATION OF THE CONTRACT

Only a Glenbrook  officer may approve a change in or waive any  provision of the
Contract.  Any change or waiver must be in  writing.  None of our agents has the
authority to change or waive the  provisions of the Contract.  We may not change
the terms of the Contract  without your consent,  except to conform the Contract
to  applicable  law or changes in the law.  If a  provision  of the  Contract is
inconsistent with state law, we will follow state law.

ASSIGNMENT

We will not honor an  assignment  of an interest in a Contract as  collateral or
security for a loan. However,  you may assign periodic income payments under the
Contract  prior to the Payout Start Date.  No  Beneficiary  may assign  benefits
under the  Contract  until they are due. We will not be bound by any  assignment
until the assignor signs it and files it with us. We are not responsible for the
validity of any assignment. Federal law prohibits or restricts the assignment of
benefits  under many types of  retirement  plans and the terms of such plans may
themselves contain restrictions on assignments. An assignment may also result in
taxes or tax  penalties.  You should  consult with an attorney  before trying to
assign your Contract.

                                       13
<PAGE>

PURCHASES
--------------------------------------------------------------------------------

MINIMUM PURCHASE PAYMENTS

Your initial purchase payment must be at least $10,000.  All subsequent purchase
payments must be $500 or more. You may make purchase  payments at any time prior
to the Payout Start Date. We may limit the amount of each purchase  payment that
we will accept to a minimum of $500 and a maximum of $1,000,000. We also reserve
the right to reject any application.

AUTOMATIC ADDITIONS PROGRAM

You  may  make  subsequent  purchase  payments  of $100 or  more  per  month  by
automatically  transferring  money from your bank account.  Please  consult with
your sales representative for detailed information.

ALLOCATION OF PURCHASE PAYMENTS

At the time you apply for a  Contract,  you must  decide  how to  allocate  your
purchase payments among the investment alternatives.  The allocation you specify
on your  application will be effective  immediately.  All allocations must be in
whole  percents  that  total  100% or in  whole  dollars.  You can  change  your
allocations  by  notifying  us in  writing.  We  reserve  the right to limit the
availability of the investment alternatives.

We will allocate your purchase payments to the investment alternatives according
to your most  recent  instructions  on file  with us.  Unless  you  notify us in
writing otherwise,  we will allocate  subsequent  purchase payments according to
the allocation for the previous purchase  payment.  We will effect any change in
allocation  instructions  at the time we receive written notice of the change in
good order.

We will credit the initial  purchase  payment that  accompanies  your  completed
application to your Contract within 2 business days after we receive the payment
at our  headquarters.  If your  application  is  incomplete,  we will ask you to
complete your  application  within 5 business days. If you do so, we will credit
your  initial  purchase  payment to your  Contract  within  that 5 business  day
period.  If you do not, we will return your purchase payment at the end of the 5
business day period unless you expressly  allow us to hold it until you complete
the application.  We will credit subsequent purchase payments to the Contract at
the close of the business  day on which we receive the  purchase  payment at our
headquarters.

We use the term  "business  day" to refer to each day Monday through Friday that
the New York Stock Exchange is open for business. We also refer to these days as
"Valuation  Dates." Our  business  day closes  when the New York Stock  Exchange
closes,  usually 4 p.m.  Eastern Time (3 p.m.  Central Time). If we receive your
purchase payment after 3 p.m. Central Time on any Valuation Date, we will credit
your purchase  payment using the  Accumulation  Unit Values computed on the next
Valuation Date.

CREDIT ENHANCEMENT

There are two Credit  Enhancement  options  available  under the  Contract.  You
select one of these options in your application.

Option 1

Each time you make a  purchase  payment,  we will add to your  Contract  Value a
Credit Enhancement equal to 4% of the purchase payment.

Option 2

Each time you make a  purchase  payment,  we will add to your  Contract  Value a
Credit  Enhancement  equal to 2% of the  purchase  payment.  And,  on every  5th
Contract Anniversary during the Accumulation Phase, we will add to your Contract
Value a  Credit  Enhancement  equal  to 2% of  your  Contract  Value  as of such
Contract Anniversary.

                                       14
<PAGE>

We  will  allocate  any  Credit  Enhancements  to  the  investment  alternatives
according to the allocation instructions you have on file with us at the time we
receive your purchase  payment.  We will allocate each Credit  Enhancement among
the  investment  alternatives  in the  same  proportions  as  the  corresponding
purchase   payment   (except   that  any  portion  of  the  Credit   Enhancement
corresponding to the value in any Fixed Account Option will instead be allocated
to the Money Market  Variable  Sub-account).  Thereafter  you may instruct us to
allocate  these  funds  to any  investment  alternative  you  choose.  We do not
consider  Credit  Enhancements  to be investments in the Contract for income tax
purposes.

We use a portion of the withdrawal  charge and mortality and expense risk charge
to help recover the cost of providing the Credit Enhancement under the Contract.
See  "Expenses."  Under certain  circumstances  (such as a period of poor market
performance) the cost associated with the Credit  Enhancement may exceed the sum
of the Credit  Enhancement  and any related  earnings.  You should consider this
possibility before purchasing the Contract.

RIGHT TO CANCEL

You may cancel  the  Contract  by  returning  it to us within  the  Cancellation
Period,  which is the 20 day period  after you  receive  the  Contract,  or such
longer period that your state may require. You may return it by delivering it or
mailing  it to us.  If  you  exercise  this  "Right  to  Cancel,"  the  Contract
terminates  and we will  pay you  the  full  amount  of your  purchase  payments
allocated  to the Fixed  Account.  We also will  return your  purchase  payments
allocated to the Variable Account adjusted,  to the extent state law permits, to
reflect  investment  gain or loss  that  occurred  from the  date of  allocation
through the date of cancellation. Some states may require us to return a greater
amount to you.

We are applying for regulatory  relief to enable us to recover the amount of any
Credit   Enhancement   applied  to  Contracts  that  are  cancelled  during  the
Cancellation  Period.  Until  we  receive  such  relief,  we will  return,  upon
cancellation,  the  amount  you would  have  received  had there  been no Credit
Enhancement. If we receive the requested regulatory relief, the amount we return
to you upon  exercise  of this  Right to  Cancel  will not  include  any  Credit
Enhancement  or the amount of charges  deducted prior to  cancellation  but will
reflect,  except in states  where we are  required  to return the amount of your
purchase  payments,  any investment  gain or loss  associated with your Variable
Account purchase payments and with the Credit Enhancement.

                                       15
<PAGE>

CONTRACT VALUE
--------------------------------------------------------------------------------

On the Issue Date, the Contract Value is equal to the initial  purchase  payment
plus the Credit Enhancement.  Thereafter, your Contract Value at any time during
the  Accumulation  Phase is equal to the sum of the  value of your  Accumulation
Units in the Variable  Sub-Accounts  you have  selected,  plus the value of your
interest in the Fixed Account Options.

ACCUMULATION UNITS

To determine the number of  Accumulation  Units of each Variable  Sub-Account to
allocate to your Contract,  we divide (i) the amount of the purchase  payment or
transfer you have allocated to a Variable  Sub-Account by (ii) the  Accumulation
Unit Value of that  Variable  Sub-Account  next  computed  after we receive your
payment or  transfer.  For  example,  if we receive a $10,000  purchase  payment
allocated to a Variable  Sub-Account  when the  Accumulation  Unit Value for the
Sub-Account  is $10, we would credit 1,000  Accumulation  Units of that Variable
Sub-Account to your Contract. If you select Credit Enhancement Option 1, we also
would credit an additional 40 Accumulation Units of that Variable Sub-Account to
your Contract to reflect the 4% Credit  Enhancement on your purchase payment (20
additional  Units  under  Option 2, and  additional  Units  every  5th  Contract
Anniversary if applicable).  See "Credit Enhancement." Withdrawals and transfers
from a Variable Sub-Account would, of course,  reduce the number of Accumulation
Units of that Sub-Account allocated to your Contract.

ACCUMULATION UNIT VALUE

As a general matter,  the Accumulation Unit Value for each Variable  Sub-Account
will rise or fall to reflect:

  . changes in the share price of the Fund in which the Variable Sub-Account
    invests, and

  . the deduction of amounts  reflecting  the mortality and expense risk charge,
    administrative expense charge, and any provision for taxes that have accrued
    since we last calculated the Accumulation Unit Value.


We determine contract maintenance charges, withdrawal charges, and transfer fees
(currently  waived)  separately  for  each  Contract.  They  do not  affect  the
Accumulation Unit Value. Instead, we obtain payment of those charges and fees by
redeeming  Accumulation  Units. For details on how we compute  Accumulation Unit
Value, please refer to the Statement of Additional Information.

We determine a separate Accumulation Unit Value for each Variable Sub-Account on
each  Valuation  Date.  We also  determine a separate set of  Accumulation  Unit
Values  reflecting  the cost of the Enhanced  Death Benefit  Rider  described on
pages 32, 33 and 34 below.

You  should  refer  to the  prospectus  for  the  Funds  that  accompanies  this
prospectus  for a description  of how the assets of each Fund are valued,  since
that  determination  directly  bears  on  the  Accumulation  Unit  Value  of the
corresponding Variable Sub-Account and, therefore, your Contract Value.

                                       16
<PAGE>

INVESTMENT ALTERNATIVES: The Variable Sub-Accounts
--------------------------------------------------------------------------------

You may allocate your purchase payments to up to 17 Variable Sub-Accounts.  Each
Variable  Sub-Account  invests in the shares of a corresponding  Fund. Each Fund
has its own investment  objective(s) and policies. We briefly describe the Funds
below.

For more  complete  information  about each Fund,  including  expenses and risks
associated with the Fund,  please refer to the  accompanying  prospectus for the
Fund. You should carefully review the Fund prospectus before allocating  amounts
to the Variable  Sub-Accounts.  A I M Advisors,  Inc.  serves as the  investment
advisor to each Fund.

<TABLE>
<CAPTION>
            Fund:            Each Fund Seeks:*
            -----            -----------------
   <S>                       <C>
   AIM V.I. Aggressive
    Growth Fund**..........  Long-term growth of capital.
   AIM V.I. Balanced Fund..  As high a total return as possible, consistent
                             with preservation of capital.
   AIM V.I. Blue Chip Fund.  Long-term growth of capital with a
                             secondary objective of current income.
   AIM V.I. Capital
    Appreciation Fund......  Growth of capital.
   AIM V.I. Capital
    Development Fund.......  Long-term growth of capital.
   AIM V.I. Dent
    Demographic Trends
    Fund...................  Long-term growth of capital.
   AIM V.I. Diversified
    Income Fund............  High level of current income.
   AIM V.I. Global Growth    Long-term growth of capital together with
    and Income Fund........  current income.
   AIM V.I. Global
    Utilities Fund.........  High total return.
   AIM V.I. Government       High level of current income consistent with
    Securities Fund........  reasonable concern for safety of principal.
   AIM V.I. Growth Fund....  Growth of capital.
   AIM V.I. Growth and       Growth of capital with a secondary objective
    Income Fund............  of current income.
   AIM V.I. High Yield
    Fund...................  High level of current income.
   AIM V.I. International
    Equity Fund............  Long-term growth of capital.
   AIM V.I. Money Market     As high a level of current income as is
    Fund...................  consistent with the preservation of capital and liquidity.
   AIM V.I.
    Telecommunications and
    Technology Fund........  Long-term growth of capital.
   AIM V.I. Value Fund.....  Long-term growth of capital. Income is a
                             secondary objective.
</TABLE>
----------------

   * A  Fund's  investment  objective  may be  changed  by the  Fund's  Board of
     Trustees without shareholders approval.

  ** Due to the  sometime  limited  availability  of common  stocks of small-cap
     companies that meet the investment  criteria for AIM V.I. Aggressive Growth
     Fund,  the Fund may  periodically  suspend  or limit  the  offering  of its
     shares.  The Fund will be closed to new participants when Fund assets reach
     $200  million.  If the  Fund is  closed,  Contract  owners  maintaining  an
     allocation of Contract Value in that Fund will nevertheless be permitted to
     allocate additional purchase payments to the Fund.

Amounts  you  allocate to Variable  Sub-Accounts  may grow in value,  decline in
value, or grow less than you expect,  depending on the investment performance of
the Funds in which those Variable  Sub-Accounts  invest. You bear the investment
risk that the Funds might not meet their  investment  objectives.  Shares of the
Funds are not deposits, or obligations of, or guaranteed or endorsed by any bank
and are not insured by the Federal Deposit  Insurance  Corporation,  the Federal
Reserve Board or any other agency.

                                       17
<PAGE>

INVESTMENT ALTERNATIVES: The Fixed Account Options
--------------------------------------------------------------------------------

You may  allocate  all or a  portion  of your  purchase  payments  to the  Fixed
Account.  You may choose from among 2 Fixed Account  Options  including a dollar
cost averaging option and the option to invest in one or more Guarantee Periods.
The Fixed  Account  Options may not be available in all states.  Please  consult
with your  sales  representative  for  current  information.  The Fixed  Account
supports our insurance and annuity  obligations.  Amounts allocated to the Fixed
Account become part of the general assets of Glenbrook.  Allstate Life Insurance
Company  invests the assets of the general account in accordance with applicable
laws governing the investment of insurance  company  general  accounts.  We have
sole discretion to invest the assets of the Fixed Account, subject to applicable
law.  Any money you allocate to a Fixed  Account  Option does not entitle you to
share in the investment experience of the Fixed Account.

DOLLAR COST AVERAGING OPTION

You may establish a Dollar Cost Averaging  Program,  as described on page 22, by
allocating  purchase payments to the Fixed Account for 9 months ("9 Month Dollar
Cost Averaging  Option").  Your purchase payments and related Credit Enhancement
will earn interest at the current rates in effect for this Option at the time of
allocation.  Rates may differ from those  available  for the  Guarantee  Periods
described below.

You must  transfer  all of your money out of the 9 Month  Dollar Cost  Averaging
Option to other investment  alternatives in equal monthly installments beginning
within 30 days of allocation. At the end of the 9 month period, we will transfer
any remaining  amounts in the 9 Month Dollar Cost Averaging Account to the other
investment alternatives you designated. Transfers out of the 9 Month Dollar Cost
Averaging  Option do not count  towards the 12  transfers  you can make  without
paying a transfer fee.

You may not transfer  funds from other  investment  alternatives  to the 9 Month
Dollar Cost Averaging Option.

The 9 Month Dollar Cost Averaging Option may not be available in your state.

GUARANTEE PERIODS

Each purchase payment and related Credit  Enhancement or transfer allocated to a
Guarantee  Period earns  interest at a specified  rate that we  guarantee  for a
period  of  years.  Guarantee  Periods  may  range  from 1 to 10  years.  We are
currently  offering  Guarantee Periods of 1, 3, 5, 7, and 10 years in length. In
the future we may offer Guarantee  Periods of different lengths or stop offering
some Guarantee Periods.

You select a  Guarantee  Period for each  purchase  or  transfer.  If you do not
select a Guarantee  Period,  we will assign the same  period(s) you selected for
your most recent purchase payment.

We reserve the right to limit the number of  additional  purchase  payments that
you may allocate to this Option.

INTEREST RATES

We will tell you what interest rates and Guarantee  Periods we are offering at a
particular time. We may declare  different  interest rates for Guarantee Periods
of the same  length  that  begin at  different  times.  We will not  change  the
interest  rate that we credit to a  particular  allocation  until the end of the
relevant Guarantee Period.

We have no specific  formula for  determining  the rate of interest that we will
declare  initially or in the future.  We will set those  interest rates based on
investment returns available at the time of the determination.  In addition,  we
may consider  various  other factors in  determining  interest  rates  including
regulatory  and  tax  requirements,  our  sales  commission  and  administrative
expenses,  general economic trends,  and competitive  factors.  We determine the
interest rates to be declared in our sole discretion. We can neither predict nor
guarantee  what those rates will be in the future.  For  current  interest  rate
information,  please contact your sales  representative  or our Customer Support
Unit at  1-800-776-6978.  The interest  rate will never be less than the minimum
guaranteed rate stated in the Contract.

                                       18
<PAGE>

HOW WE CREDIT INTEREST

We will credit interest daily to each amount  allocated to a Guarantee Period at
a rate that compounds to the effective  annual interest rate that we declared at
the  beginning  of  the  applicable  Guarantee  Period.  The  following  example
illustrates how a purchase payment allocated to this Option would grow, given an
assumed Guarantee Period and annual interest rate:

<TABLE>
   <S>                                                                  <C>
   Purchase Payment plus Credit Enhancement............................ $10,000
   Guarantee Period.................................................... 5 years
   Annual Interest Rate................................................    4.50%
</TABLE>

                              END OF CONTRACT YEAR

<TABLE>
<CAPTION>
                            YEAR 1     YEAR 2     YEAR 3     YEAR 4     YEAR 5
                          ---------- ---------- ---------- ---------- ----------
<S>                       <C>        <C>        <C>        <C>        <C>
Beginning Contract Value  $10,000.00
X (1 + Annual Interest
 Rate)                    X    1.045
                          $10,450.00
Contract Value at end of
 Contract Year                       $10,450.00
X (1 + Annual Interest
 Rate)                                   X1.045
                                     $10,920.25
Contract Value at end of
 Contract Year                                  $10,920.25
X (1 + Annual Interest
 Rate)                                          X    1.045
                                                $11,411.66
Contract Value at end of
 Contract Year                                             $11,411.66
X (1 + Annual Interest
 Rate)                                                     X    1.045
                                                           $11,925.19
Contract Value at end of
 Contract Year                                                        $11,925.19
X (1 + Annual Interest
 Rate)                                                                X    1.045
                                                                      $12,461.82
</TABLE>

Total Interest Credited During Guarantee Period = $2,461.82 ($12,461.82-
$10,000)

This example assumes no withdrawals  during the entire 5 year Guarantee  Period.
If you  were  to  make a  partial  withdrawal,  you  may  be  required  to pay a
withdrawal  charge.  In  addition,  the amount  withdrawn  may be  increased  or
decreased by a Market Value  Adjustment that reflects  changes in interest rates
since the time you invested the amount withdrawn. The hypothetical interest rate
is for illustrative purposes only and is not intended to predict future interest
rates to be declared under the Contract.  Actual interest rates declared for any
given  Guarantee  Period may be more or less than shown  above but will never be
less than the guaranteed minimum rate stated in the Contract.

RENEWALS

Prior to the end of each Guarantee  Period, we will mail you a notice asking you
what to do with your money,  including the accrued  interest.  During the 30-day
period after the end of the Guarantee Period, you may:

  1) take no action. We will  automatically  apply your money to a new Guarantee
  Period of the same length as the expired Guarantee  Period.  The new Guarantee
  Period  will begin on the day the  previous  Guarantee  Period  ends.  The new
  interest rate will be our then current declared rate for a Guarantee Period of
  that length; or

  2)  instruct  us to apply your money to one or more new  Guarantee  Periods of
  your choice.  The new Guarantee  Period(s)  will begin on the day the previous
  Guarantee Period ends. The new interest rate will be our then current declared
  rate for those Guarantee Periods; or

  3)  instruct  us to  transfer  all or a portion  of your  money to one or more
  Variable  Sub-Accounts of the Variable Account. We will effect the transfer on
  the  day  we  receive  your  instructions.  We  will  not  adjust  the  amount
  transferred to include a Market Value Adjustment; or

                                       19
<PAGE>

  4)  withdraw  all or a portion of your  money.  You may be  required  to pay a
  withdrawal  charge,  but we will not adjust the amount  withdrawn to include a
  Market  Value  Adjustment.  You may also be required to pay premium  taxes and
  withholding (if applicable).  The amount withdrawn will be deemed to have been
  withdrawn on the day the previous Guarantee Period ends. Amounts not withdrawn
  will be applied to a new  Guarantee  Period of the same length as the previous
  Guarantee Period.  The new Guarantee Period will begin on the day the previous
  Guarantee Period ends.

MARKET VALUE ADJUSTMENT

All  withdrawals in excess of the Free Withdrawal  Amount,  and transfers from a
Guarantee  Period,  other than  those  taken  during  the 30 day period  after a
Guarantee  Period expires,  are subject to a Market Value  Adjustment.  A Market
Value  Adjustment  also may apply upon  payment of a death  benefit and when you
apply amounts  currently  invested in this option to an Income Plan (unless paid
or applied during the 30-day period after such  Guarantee  Period  expires).  We
will not apply a Market Value Adjustment to a withdrawal you make:

  . within the Free Withdrawal Amount as described on page 25,

  . to satisfy IRS minimum distribution rules for the Contract,

  . as part of the Dollar Cost Averaging Program, or

  . when exercising the confinement, unemployment or terminal illness
    waivers.

We apply the Market Value  Adjustment to reflect  changes in interest rates from
the time  you  first  allocate  money to a  Guarantee  Period  to the time it is
removed from that Guarantee  Period. We calculate the Market Value Adjustment by
comparing the Treasury  Rate for a period equal to the  Guarantee  Period at its
inception to the Treasury Rate for a period equal to the  Guarantee  Period when
you remove your money.  "Treasury  Rate" means the U.S.  Treasury  Note Constant
Maturity Yield as reported in Federal Reserve Bulletin Release H.15.

The Market Value Adjustment may be positive or negative, depending on changes in
interest rates. As such, you bear the investment risk associated with changes in
interest  rates.  If interest  rates  increase  significantly,  the Market Value
Adjustment and any withdrawal charge,  premium taxes, and income tax withholding
(if applicable) could reduce the amount you receive upon full withdrawal of your
Contract Value to an amount that is less than the purchase payment plus interest
at the minimum guaranteed interest rate under the Contract.

Generally,  if the original  Treasury  Rate at the time you allocate  money to a
Guarantee  Period is higher than the applicable  current Treasury Rate, then the
Market  Value  Adjustment  will  result  in a  higher  amount  payable  to  you,
transferred,  or applied to an Income Plan. Conversely,  if the Treasury Rate at
the time we  established  the  Guarantee  Period  is lower  than the  applicable
current  Treasury Rate, then the Market Value  Adjustment will result in a lower
amount payable to you, transferred, or applied to an Income Plan.

  For  example,  assume that you  purchase a Contract  and you select an initial
  Guarantee  Period of 5 years and the 5 year Treasury Rate for that duration is
  4.50%. Assume that at the end of 3 years, you make a partial  withdrawal.  If,
  at that later time, the current 5 year Treasury Rate is 4.20%, then the Market
  Value  Adjustment  will be  positive,  which will result in an increase in the
  amount  payable to you.  Conversely,  if the current 5 year  Treasury  Rate is
  4.80%, then the Market Value Adjustment will be negative, which will result in
  a decrease in the amount payable to you.

The formula for calculating  Market Value Adjustments is set forth in Appendix A
to this prospectus,  which also contains  additional examples of the application
of the Market Value Adjustment.

                                       20
<PAGE>

INVESTMENT ALTERNATIVES: Transfers
--------------------------------------------------------------------------------

TRANSFERS DURING THE ACCUMULATION PHASE

During  the  Accumulation  Phase,  you may  transfer  Contract  Value  among the
investment  alternatives.  Transfers are not  permitted  into the 9 Month Dollar
Cost Averaging  Option.  You may request  transfers in writing on a form that we
provide or by telephone  according to the procedure described below. There is no
minimum  transfer amount.  We currently do not assess,  but reserve the right to
assess,  a $10 charge on each  transfer in excess of 12 per  Contract  Year.  We
treat transfers to or from more than one Fund on the same day as one transfer.

We will process transfer  requests that we receive before 3:00 p.m. Central Time
on any Valuation Date using the Accumulation  Unit Values for that Date. We will
process  requests  completed  after 3:00 p.m.  on any  Valuation  Date using the
Accumulation Unit Values for the next Valuation Date. The Contract permits us to
defer  transfers from the Fixed Account Options for up to 6 months from the date
we receive  your  request.  If we decide to  postpone  transfers  from any Fixed
Account  Option  for 30 days or  more,  we will  pay  interest  as  required  by
applicable  law.  Any  interest  would be payable  from the date we receive  the
transfer request to the date we make the transfer.

If you  transfer an amount from a Guarantee  Period other than during the 30 day
period after a Guarantee Period expires, we will increase or decrease the amount
by a Market Value Adjustment.

We reserve the right to waive any transfer restrictions.

TRANSFERS DURING THE PAYOUT PHASE

During the Payout Phase, you may make transfers among the Variable  Sub-Accounts
to change the  relative  weighting of the  Variable  Sub-Accounts  on which your
variable  income  payments will be based.  In addition,  you will have a limited
ability  to make  transfers  from the  Variable  Sub-Accounts  to  increase  the
proportion of your income payments consisting of fixed income payments.  You may
not,  however,  convert any of your fixed income  payments into variable  income
payments. You may not make any transfers for the first 6 months after the Payout
Start Date. Thereafter,  you may make transfers among the Variable Sub- Accounts
or make transfers from the Variable  Sub-Accounts  to increase the proportion of
your income payments consisting of fixed income payments. Your transfers must be
at least 6 months apart.

TELEPHONE TRANSFERS

You may make transfers by telephone by calling 1-800-776-6978.  The cut off time
for telephone transfer requests is 3:00 p.m. Central Time. In the event that the
New York Stock Exchange closes early, i.e., before 3:00 p.m. Central Time, or in
the event that the  Exchange  closes early for a period of time but then reopens
for trading on the same day, we will process  telephone  transfer requests as of
the close of the Exchange on that particular  day. We will not accept  telephone
requests  received at any telephone number other than the number that appears in
this paragraph or received after the close of trading on the Exchange.

We may suspend, modify or terminate the telephone transfer privilege at any time
without notice.

We use  procedures  that  we  believe  provide  reasonable  assurance  that  the
telephone transfers are genuine.  For example,  we tape telephone  conversations
with  persons  purporting  to  authorize   transfers  and  request   identifying
information.  Accordingly,  we disclaim any liability for losses  resulting from
allegedly  unauthorized  telephone  transfers.   However,  if  we  do  not  take
reasonable steps to help ensure that a telephone  authorization is valid, we may
be liable for such losses.

                                       21
<PAGE>

EXCESSIVE TRADING LIMITS

We reserve the right to limit  transfers in any Contract  Year, or to refuse any
transfer request for a Contract owner or certain Contract owners, if:

  . we believe, in our sole discretion,  that excessive trading by such Contract
    owner or  owners,  or a  specific  transfer  request  or  group of  transfer
    requests,  may have a detrimental  effect on the Accumulation Unit Values of
    any Variable  Sub-Account or the share prices of the corresponding  Funds or
    would be to the disadvantage of other Contract owners; or

  . we are informed by one or more of the  corresponding  Funds that they intend
    to restrict the purchase or redemption  of Fund shares  because of excessive
    trading or  because  they  believe  that a  specific  transfer  or groups of
    transfers would have a detrimental effect on the prices of Fund shares.

We may apply the  restrictions  in any  manner  reasonably  designed  to prevent
transfers that we consider disadvantageous to other Contract owners.

DOLLAR COST AVERAGING PROGRAM

You may make transfers  automatically through dollar cost averaging prior to the
Payout  Start  Date.  There  are three  different  ways to use the  Dollar  Cost
Averaging Program:

  1) You may allocate  purchase  payments to the Fixed  Account  Options for the
  specific purpose of dollar cost averaging.

  2) You may dollar cost average out of any Variable  Sub-account into any other
  Variable Sub-account(s).

  3) You may  transfer  interest  credited  from a  Guarantee  Period(s)  to any
  Variable Sub-account without application of a Market Value Adjustment.

We will not charge a transfer fee for  transfers  made under this  Program,  nor
will such  transfers  count  against the 12 transfers you can make each Contract
Year without paying a transfer fee.

The theory of dollar cost averaging is that if purchases of equal dollar amounts
are made at fluctuating prices, the aggregate average cost per unit will be less
than  the  average  of the unit  prices  on the same  purchase  dates.  However,
participation  in this Program does not assure you of a greater profit from your
purchases under the Program nor will it prevent or necessarily  reduce losses in
a declining market.

AUTOMATIC FUND REBALANCING PROGRAM

Once  you have  allocated  your  money  among  the  Variable  Sub-Accounts,  the
performance  of  each  Sub-Account  may  cause  a shift  in the  percentage  you
allocated to each  Sub-Account.  If you select our  Automatic  Fund  Rebalancing
Program,  we will  automatically  rebalance the Contract  Value in each Variable
Sub-Account  and  return it to the  desired  percentage  allocations.  Money you
allocate to the Fixed Account will not be included in the rebalancing.

We will rebalance your account each quarter according to your  instructions.  We
will transfer amounts among the Variable  Sub-Accounts to achieve the percentage
allocations  you  specify.  You  can  change  your  allocations  at any  time by
contacting us in writing or by telephone.  The new allocation  will be effective
with the  first  rebalancing  that  occurs  after we  receive  your  written  or
telephone  request.  We are not responsible for rebalancing that occurs prior to
receipt of proper notice of your request.

  Example:

     Assume that you want your initial  purchase  payment split among 2 Variable
     Sub-Accounts.  You  want  40%  to be in the  AIM  V.I.  Diversified  Income
     Variable  Sub-Account  and 60% to be in the AIM V.I.  Growth  Variable Sub-
     Account.  Over the next 2 months the bond  market  does very well while the
     stock market performs poorly. At the end of the first quarter, the AIM V.I.
     Diversified Income Variable Sub-Account now represents 50% of your holdings
     because  of its  increase  in value.  If you  choose to have your  holdings


                                       22
<PAGE>

     rebalanced  quarterly,  on the first day of the next  quarter we would sell
     some of your units in the AIM V.I.  Diversified Income Variable Sub-Account
     and use the money to buy more units in the AIM V.I.  Growth  Variable  Sub-
     Account  so that  the  percentage  allocations  would  again be 40% and 60%
     respectively.

The Automatic Fund Rebalancing Program is available only during the Accumulation
Phase.  The  transfers  made  under  the  Program  do not count  towards  the 12
transfers  you can make without  paying a transfer fee, and are not subject to a
transfer fee.

Fund  rebalancing is consistent with  maintaining your allocation of investments
among market  segments,  although it is  accomplished  by reducing your Contract
Value allocated to the better performing segments.

                                       23
<PAGE>

EXPENSES
--------------------------------------------------------------------------------

As a Contract  owner,  you will bear,  directly or  indirectly,  the charges and
expenses described below.

CONTRACT MAINTENANCE CHARGE

During the Accumulation  Phase, on each Contract  Anniversary,  we will deduct a
$35  contract  maintenance  charge  from your  Contract  Value  invested in each
Variable  Sub-Account  in proportion to the amount  invested.  During the Payout
Phase, we will deduct the charge proportionately from each income payment.

The charge is to compensate us for the cost of  administering  the Contracts and
the Variable Account. Maintenance costs include expenses we incur in billing and
collecting  purchase payments;  keeping records;  processing death claims,  cash
withdrawals, and policy changes; proxy statements; calculating Accumulation Unit
Values  and  income  payments;  and  issuing  reports  to  Contract  owners  and
regulatory  agencies.  We cannot increase the charge.  We will waive this charge
if:

  . total purchase payments equal $50,000 or more, or

  . all money is allocated to the Fixed Account Options, as of the Contract
    Anniversary.

After the Payout  Start  Date,  we will  waive this  charge if, as of the Payout
Start Date:

  . the Contract Value is $50,000 or more, or

  . all income payments are fixed amount income payments.

If you  surrender  your  Contract,  we will deduct a full  contract  maintenance
charge, unless your Contract qualifies for a waiver.

MORTALITY AND EXPENSE RISK CHARGE

We deduct a mortality  and expense  risk charge daily at an annual rate of 1.40%
of the average daily net assets you have  invested in the Variable  Sub-Accounts
(1.60% if you select the  Enhanced  Death  Benefit  Rider).  The  mortality  and
expense  risk  charge  is for all the  insurance  benefits  available  with your
Contract (including our guarantee of annuity rates and the death benefits),  for
certain expenses of the Contract,  and for assuming the risk (expense risk) that
the  current  charges  will be  sufficient  in the  future  to cover the cost of
administering the Contract and the cost of the Credit Enhancement.  We expect to
make a profit from this fee. However,  if the charges under the Contract are not
sufficient,  then Glenbrook will bear the loss. We charge additional amounts for
the Enhanced Death Benefit Rider to compensate us for the  additional  risk that
we accept by providing the rider.

We guarantee the mortality and expense risk charge and we cannot increase it. We
assess the mortality and expense risk charge during both the Accumulation  Phase
and the Payout Phase.

ADMINISTRATIVE EXPENSE CHARGE

We deduct an  administrative  expense charge daily at an annual rate of 0.10% of
the average daily net assets you have invested in the Variable Sub-Accounts.  We
intend  this  charge to cover  actual  administrative  expenses  that exceed the
revenues  from  the  contract   maintenance   charge.   There  is  no  necessary
relationship  between  the amount of  administrative  charge  imposed on a given
Contract and the amount of expenses that may be  attributable  to that Contract.
We assess  this  charge  each day during the  Accumulation  Phase and the Payout
Phase. We guarantee that we will not raise this charge.

TRANSFER FEE

We reserve the right to charge $10 per transfer  after the 12th transfer in each
Contract Year. We will not charge a transfer fee on transfers that are part of a
Dollar Cost Averaging Program or Automatic Fund Rebalancing Program.

                                       24
<PAGE>

WITHDRAWAL CHARGE

We may assess a  withdrawal  charge of up to 8% of the purchase  payment(s)  you
withdraw.  The charge  declines  to 0% after 8  complete  years from the date we
received the purchase payment being withdrawn. A schedule showing how the charge
declines  appears on page 8, above.  During each Contract Year, you can withdraw
up to 15% of the Contract  Value as of the  beginning of that Contract Year (15%
of the initial  purchase  payment during the first Contract Year) without paying
the charge. Unused portions of this 15% "Free Withdrawal Amount" are not carried
forward  to  future  Contract  Years.  Credit  Enhancements  are not  considered
purchase  payments when determining the Free Withdrawal Amount in the first year
of the Contract. See "Contract" for details.

We will deduct  withdrawal  charges,  if  applicable,  from the amount paid. For
purposes of the withdrawal  charge, we will treat withdrawals as coming from the
oldest  purchase  payments  first.  However,  for federal  income tax  purposes,
earnings  are  considered  to come out first,  which  means you pay taxes on the
earnings portion of your withdrawal.

We do not apply a withdrawal charge in the following situations:

  . on the  Payout  Start  Date (a  withdrawal  charge may apply if you elect to
    receive income payments for a specified period of less than 120 months);

  . the death of the Contract owner or Annuitant (unless the Settlement Value
    is used);

  . withdrawals taken to satisfy IRS minimum distribution rules for the
    Contract; or

  . withdrawals that qualify for one of the waivers described below.

We use the amounts obtained from the withdrawal  charge to pay sales commissions
and other  promotional or  distribution  expenses  associated with marketing the
Contracts and to help defray the cost of the Credit  Enhancement.  To the extent
that the  withdrawal  charge  does not  cover all  sales  commissions  and other
promotional or distribution expenses, or the cost of the Credit Enhancement,  we
may use any of our corporate assets,  including potential profit which may arise
from the mortality and expense risk charge or any other charges or fee described
above, to make up any difference.

Withdrawals  also may be  subject  to tax  penalties  or income tax and a Market
Value Adjustment.  You should consult your own tax counsel or other tax advisers
regarding any withdrawals.

CONFINEMENT WAIVER

We will  waive the  withdrawal  charge and any Market  Value  Adjustment  on all
withdrawals  taken  prior to the Payout  Start Date under your  Contract  if the
following conditions are satisfied:

  1) you, or the Annuitant if the Contract is owned by a non-natural person, are
  first  confined to a long term care  facility or a hospital (as defined in the
  Contract) for at least 90  consecutive  days.  You or the Annuitant must enter
  the long term care facility or hospital at least 30 days after Issue Date;

  2) we receive your request for the withdrawal and due proof (as defined in the
  Contract) of the stay no later than 90 days  following  the end of your or the
  Annuitant's stay at the long term care facility or hospital; and

  3) a physician  must have  prescribed  the stay and the stay must be medically
  necessary (as defined in the Contract).

You may not claim this benefit if you, or the Annuitant,  or a member of your or
the Annuitant's immediate family (as defined in the Contract),  is the physician
prescribing your or the Annuitant's stay in a long term care facility.

                                       25
<PAGE>

TERMINAL ILLNESS WAIVER

We will  waive the  withdrawal  charge and any Market  Value  Adjustment  on all
withdrawals taken prior to the Payout Start Date under your Contract if:

  1) you (or the  Annuitant if the Contract  owner is not a natural  person) are
  first diagnosed by a physician (we may require a second or third opinion) with
  a terminal  illness  (as defined in the  Contract)  at least 30 days after the
  Issue Date; and

  2) you claim this benefit and deliver adequate proof of diagnosis to us.

UNEMPLOYMENT WAIVER

We will  waive the  withdrawal  charge and any Market  Value  Adjustment  on one
partial or a full  withdrawal  taken  prior to the Payout  Start Date under your
Contract, if you meet the following requirements:

  1) you or the Annuitant become unemployed at least one year after the Issue
  Date;

  2) you or the  Annuitant  have  been  granted  unemployment  compensation  (as
  defined in the Contract) for at least 30 consecutive  days as a result of that
  unemployment  and we receive due proof  thereof  (as defined in the  Contract)
  prior to or at the time of the withdrawal request; and

  3) you or the Annuitant  exercise this benefit  within 180 days of your or the
  Annuitant's initial receipt of unemployment compensation.

You may exercise this benefit once during the life of your Contract. This waiver
applies upon the unemployment of the Annuitant only if the Contract owner is not
a natural person.

Please refer to your Contract for more detailed  information about the terms and
conditions of these waivers.

The laws of your state may limit the  availability of these waivers and may also
change certain terms and/or  benefits  available  under the waivers.  You should
consult your Contract for further details on these variations. Also, even if you
do not need to pay our withdrawal charge because of these waivers, you still may
be required to pay taxes or tax  penalties on the amount  withdrawn.  You should
consult your tax adviser to determine the effect of a withdrawal on your taxes.

PREMIUM TAXES

Some  states  and other  governmental  entities  (e.g.,  municipalities)  charge
premium taxes or similar taxes.  We are  responsible  for paying these taxes and
will deduct them from your Contract Value.  Some of these taxes are due when the
Contract is issued, others are due when income payments begin or upon surrender.
Our  current  practice  is not to charge  anyone for these  taxes  until  income
payments begin or when a total withdrawal occurs,  including payment upon death.
We may discontinue this practice sometime in the future and deduct premium taxes
from  the  purchase  payments.  Premium  taxes  generally  range  from 0% to 4%,
depending on the state.

At the Payout Start Date, if applicable,  we deduct the charge for premium taxes
from each  investment  alternative in the proportion  that the Contract  owner's
value in the investment alternative bears to the total Contract Value.

DEDUCTION FOR SEPARATE ACCOUNT INCOME TAXES

We are not currently maintaining a provision for taxes. In the future,  however,
we may establish a provision for taxes if we determine,  in our sole discretion,
that we will incur a tax as a result of the  operation of the Variable  Account.
We will  deduct  for any  taxes we incur as a  result  of the  operation  of the
Variable  Account,  whether or not we previously  made a provision for taxes and
whether or not it was sufficient.  Our status under the Internal Revenue Code is
briefly described in the Statement of Additional Information.

OTHER EXPENSES

Each  Fund  deducts  advisory  fees and  other  expenses  from its  assets.  You
indirectly  bear the charges and  expenses of the Fund whose  shares are held by
the  Variable  Sub-Accounts.  These  fees  and  expenses  are  described  in the
accompanying  prospectus  for the Funds.  For a summary of current  estimates of
those charges and expenses, see pages 8 and 9 above. We may receive compensation
from A I M Advisors, Inc., for administrative services we provide to the Funds.

                                       26
<PAGE>

ACCESS TO YOUR MONEY
--------------------------------------------------------------------------------

You can  withdraw  some or all of your  Contract  Value at any time prior to the
Payout Start Date. Withdrawals also are available under limited circumstances on
or after the Payout Start Date. See "Income Plans" on page 29.

The amount payable upon  withdrawal is the Contract Value next computed after we
receive the request for a withdrawal at our headquarters, adjusted by any Market
Value Adjustment,  less any withdrawal charges,  contract  maintenance  charges,
income  tax  withholding,  penalty  tax,  and any  premium  taxes.  We will  pay
withdrawals  from the Variable  Account within 7 days of receipt of the request,
subject to postponement in certain circumstances.

You can withdraw money from the Variable  Account or the Fixed Account  Options.
To  complete a partial  withdrawal  from the  Variable  Account,  we will cancel
Accumulation  Units in an  amount  equal to the  withdrawal  and any  applicable
withdrawal charge and premium taxes.

You  must  name  the  investment  alternative  from  which  you are  taking  the
withdrawal.  If none is named,  then the  withdrawal  request is incomplete  and
cannot be honored.

In general,  you must  withdraw at least $50 at a time.  You also may withdraw a
lesser  amount if you are  withdrawing  your entire  interest in a Variable Sub-
Account.

If you request a total withdrawal,  you must return your Contract to us. We also
will  deduct a contract  maintenance  charge of $35,  unless we have  waived the
contract maintenance charge on your Contract.

POSTPONEMENT OF PAYMENTS

We may postpone the payment of any amounts due from the Variable  Account  under
the Contract if:

  1) The New York Stock  Exchange  is closed for other  than usual  weekends  or
  holidays, or trading on the Exchange is otherwise restricted;

  2) An emergency exists as defined by the SEC; or

  3) The SEC permits delay for your protection.

In addition,  we may delay payments or transfers from the Fixed Account  Options
for up to 6 months or shorter  period if required by law. If we delay payment or
transfer  for 30 days or more,  we will pay  interest as  required  by law.  Any
interest would be payable from the date we receive the withdrawal request to the
date we make the payment or transfer.

SYSTEMATIC WITHDRAWAL PROGRAM

You  may  choose  to  receive  systematic  withdrawal  payments  on  a  monthly,
quarterly,  semi-annual,  or annual  basis at any time prior to the Payout Start
Date.  The  minimum  amount  of  each  systematic  withdrawal  is  $50.  At  our
discretion,  systematic  withdrawals may not be offered in conjunction  with the
Dollar Cost Averaging or Automatic Fund Rebalancing Programs.

Depending  on  fluctuations  in the value of the Variable  Sub-Accounts  and the
value of the Fixed Account,  systematic  withdrawals  may reduce or even exhaust
the Contract  Value.  Income taxes may apply to systematic  withdrawals.  Please
consult your tax advisor before taking any withdrawal.

We will make systematic  withdrawal payments to you or your designated payee. We
may modify or suspend the Systematic  Withdrawal Program and charge a processing
fee for the service. If we modify or suspend the Systematic  Withdrawal Program,
existing systematic withdrawal payments will not be affected.

                                       27
<PAGE>

MINIMUM CONTRACT VALUE

If your request for a partial withdrawal would reduce the Contract Value to less
than  $1,000,  we may treat it as a request to  withdraw  your  entire  Contract
Value.  Your Contract will terminate if you withdraw all of your Contract Value.
We will, however,  ask you to confirm your withdrawal request before terminating
your  Contract.  If we terminate your  Contract,  we will  distribute to you its
Contract  Value,  adjusted  by any  applicable  Market  Value  Adjustment,  less
withdrawal and other charges and taxes.

                                       28
<PAGE>

INCOME PAYMENTS
--------------------------------------------------------------------------------

PAYOUT START DATE

You select the Payout Start Date in your application,  which must be at least 30
days after the Issue Date.  The Payout  Start Date is the day that we apply your
Contract Value  adjusted by any Market Value  Adjustment and less any applicable
taxes to an  Income  Plan.  The  Payout  Start  Date  must be no later  than the
Annuitant's 90th birthday, or the 10th Contract Anniversary, if later.

You may change the Payout  Start Date at any time by  notifying us in writing of
the change at least 30 days before the  scheduled  Payout  Start Date.  Absent a
change, we will use the Payout Start Date stated in your Contract.

INCOME PLANS

An  "Income  Plan" is a series of  payments  on a  scheduled  basis to you or to
another  person  designated  by you.  You may choose and change  your  choice of
Income Plan until 30 days before the Payout Start Date.  If you do not select an
Income Plan, we will make income  payments in accordance with Income Plan 1 with
guaranteed  payments for 10 years. After the Payout Start Date, you may not make
withdrawals (except as described below) or change your choice of Income Plan.

Three  Income  Plans are  available  under the  Contract.  Each is  available to
provide:

  . fixed income payments;

  . variable income payments; or

  . a combination of the two.

The three Income Plans are:

 .    Income Plan 1--Life Income with  Guaranteed  Payments.  Under this plan, we
     make periodic income payments for at least as long as the Annuitant  lives.
     If the  Annuitant  dies  before we have made all of the  guaranteed  income
     payments,  we will continue to pay the remainder of the  guaranteed  income
     payments as required by the Contract.

 .    Income Plan  2--Joint and Survivor  Life Income with  Guaranteed  Payments.
     Under this plan, we make periodic  income  payments for at least as long as
     either the Annuitant or the joint Annuitant is alive. If both the Annuitant
     and the joint  Annuitant  die  before  we have  made all of the  guaranteed
     income  payments,  we will continue to pay the remainder of the  guaranteed
     income payments as required by the Contract.

 .    Income Plan  3--Guaranteed  Payments for a Specified  Period (5 Years to 30
     Years).

     Under this plan, we make periodic  income  payments for the period you have
     chosen.  These  payments  do not  depend on the  Annuitant's  life.  Income
     payments for less than 120 months may be subject to a withdrawal charge. We
     will  deduct the  mortality  and  expense  risk  charge  from the  Variable
     Sub-Account  assets which support the variable income  payments  supporting
     this plan even though we do not bear any mortality risk.

The length of any  guaranteed  payment  period under your  selected  Income Plan
generally  will affect the dollar amounts of each income  payment.  As a general
rule, longer guarantee periods result in lower income payments, all other things
being equal. For example, if you choose an Income Plan with payments that depend
on the life of the Annuitant but with no minimum specified period for guaranteed
payments, the income payments generally will be greater than the income payments
made under the same Income Plan with a minimum  specified  period for guaranteed
payments.

                                       29
<PAGE>

If you choose  Income Plan 1 or 2, or, if  available,  another  Income Plan with
payments that continue for the life of the Annuitant or joint Annuitant,  we may
require proof of age and sex of the Annuitant or joint Annuitant before starting
income payments, and proof that the Annuitant or joint Annuitant is alive before
we make each payment.  Please note that under such Income Plans, if you elect to
take no minimum guaranteed payments, it is possible that the payee could receive
only 1 income  payment if the Annuitant and any joint  Annuitant both die before
the second  income  payment,  or only 2 income  payments  if they die before the
third income payment, and so on.

Generally,  you may not make  withdrawals  after  the  Payout  Start  Date.  One
exception to this rule applies if you are  receiving  variable  income  payments
that do not depend on the life of the  Annuitant  (such as under Income Plan 3).
In that case you may  terminate all or part of the Variable  Account  portion of
the  income  payments  at any time and  receive a lump sum equal to the  present
value of the remaining  variable payments  associated with the amount withdrawn.
To determine the present value of any remaining  variable  income payments being
withdrawn,  we use a discount rate equal to the assumed annual  investment  rate
that we use to complete such variable  income  payments.  The minimum amount you
may withdraw  under this feature is $1,000.  A withdrawal  charge may apply.  We
also assess applicable  premium taxes at the Payout Start Date from the Contract
Value.

We may make other Income Plans available.  You may obtain information about them
by writing or calling us.

You may apply all or part of your  Contract  Value to an Income  Plan.  You must
apply at least the  Contract  Value in the Fixed  Account  Options on the Payout
Start Date to fixed  income  payments.  If you wish to apply any portion of your
Fixed Account Option balance to provide  variable  income  payments,  you should
plan ahead and transfer  that amount to the Variable  Sub-Accounts  prior to the
Payout Start Date.  If you do not tell us how to allocate  your  Contract  Value
among fixed and variable income  payments,  we will apply your Contract Value in
the Variable  Account to variable income payments and your Contract Value in the
Fixed Account Options to fixed income payments.

We will apply your Contract Value,  adjusted by a Market Value Adjustment,  less
applicable  taxes to your Income Plan on the Payout Start Date.  If the Contract
Value is less than  $2,000 or not enough to  provide  an  initial  payment of at
least $20, and state law permits, we may:

  . pay you the Contract Value, adjusted by any Market Value Adjustment and less
    any  applicable  taxes,  in a lump sum instead of the periodic  payments you
    have chosen, or

  . reduce the  frequency of your payments so that each payment will be at least
    $20.

VARIABLE INCOME PAYMENTS

The amount of your variable income payments depends upon the investment  results
of the Variable  Sub-Accounts you select, the premium taxes you pay, the age and
sex of the  Annuitant,  and the Income Plan you choose.  We  guarantee  that the
payments  will not be affected by (a) actual  mortality  experience  and (b) the
amount of our administration expenses.

We cannot  predict  the total  amount of your  variable  income  payments.  Your
variable income  payments may be more or less than your total purchase  payments
because (a) variable  income  payments vary with the  investment  results of the
underlying  Funds and (b) the  Annuitant  could live  longer or shorter  than we
expect based on the tables we use.

In calculating the amount of the periodic  payments in the annuity tables in the
Contract,  we  assumed  an  annual  investment  rate of 3%.  If the  actual  net
investment  return of the  Variable  Sub-Accounts  you  choose is less than this
assumed investment rate, then the dollar amount of your variable income payments
will decrease. The dollar amount of your variable income payments will increase,
however,  if the actual net  investment  return  exceeds the assumed  investment
rate. The dollar amount of the variable  income  payments stays level if the net
investment  return  equals the  assumed  investment  rate.  Please  refer to the
Statement of Additional  Information for more detailed  information as to how we
determine  variable income payments.  We reserve the right to make other assumed
investment rates available under this Contract.

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<PAGE>

FIXED INCOME PAYMENTS

We guarantee  income payment  amounts  derived from any Fixed Account Option for
the duration of the Income Plan. We calculate the fixed income payments by:

  1) adjusting the portion of the Contract  Value in any Fixed Account Option on
  the Payout Start Date by any applicable Market Value Adjustment;

  2) deducting any applicable premium tax; and

  3) applying the resulting  amount to the greater of (a) the appropriate  value
  from the income  payment  table in your Contract or (b) such other value as we
  are offering at that time.

We may defer making fixed income payments for a period of up to 6 months or such
shorter  times as state law may  require.  If we defer  payments  for 30 days or
more,  we will pay  interest  as  required  by law from the date we receive  the
withdrawal request to the date we make payment.

CERTAIN EMPLOYEE BENEFIT PLANS

The Contracts  offered by this  prospectus  contain  income  payment tables that
provide  for  different  payments  to men and women of the same  age,  except in
states that require  unisex  tables.  We reserve the right to use income payment
tables that do not  distinguish  on the basis of sex to the extent  permitted by
law. In certain employment-related situations,  employers are required by law to
use the same  income  payment  tables  for men and  women.  Accordingly,  if the
Contract is to be used in connection  with an  employment-related  retirement or
benefit plan and we do not offer unisex annuity tables in your state, you should
consult  with  legal  counsel  as to  whether  the  purchase  of a  Contract  is
appropriate.

                                       31
<PAGE>

DEATH BENEFITS
--------------------------------------------------------------------------------

We will pay a death benefit if, prior to the Payout Start Date:

  1) any Contract owner dies or,

  2) the Annuitant dies, if the Contract is owned by a company or other legal
  entity.

We  will  pay  the  death  benefit  to the  new  Contract  owner  as  determined
immediately  after  the  death.  The new  Contract  owner  would be a  surviving
Contract owner or, if none, the Beneficiary(ies). In the case of the death of an
Annuitant, we will pay the death benefit to the current Contract owner.

DEATH BENEFIT AMOUNT

Prior to the Payout Start Date, the death benefit is equal to the greatest of:

  1) the Contract Value as of the date we determine the death benefit, or

  2) the Settlement  Value (that is, the amount payable on a full  withdrawal of
  Contract Value) on the date we determine the death benefit, or

  3) the sum of all purchase payments, reduced by a withdrawal adjustment, as
  defined below, or

  4) the Contract  Value on the Death Benefit  Anniversary  prior to the date we
  determine the death  benefit,  increased by purchase  payments made since that
  Death Benefit Anniversary and reduced by a withdrawal  adjustment,  as defined
  below.

A "Death Benefit  Anniversary" is every eighth Contract  Anniversary  during the
Accumulation Phase. For example, the 8th, 16th, and 24th Contract  Anniversaries
are the first three Death Benefit Anniversaries.

The  "withdrawal  adjustment"  is equal to (a)  divided by (b),  with the result
multiplied by (c), where:

  (a) is the withdrawal amount;

  (b) is the Contract Value immediately prior to the withdrawal; and

  (c) is the value of the applicable death benefit alternative immediately
  prior to the withdrawal.

We will  determine the value of the death benefit as of the end of the Valuation
Date on which we receive a complete request for payment of the death benefit. If
we receive a request  after 3 p.m.  Central  Time on a Valuation  Date,  we will
process the request as of the end of the following Valuation Date. A request for
payment of the death benefit must include Due Proof of Death. We will accept the
following documentation as "Due Proof of Death":

  . a certified copy of a death certificate,

  . a certified copy of a decree of a court of competent jurisdiction as to
    the finding of death, or

  . other documentation as we may accept in our sole discretion.

ENHANCED DEATH BENEFIT RIDER

If the Contract owner is a living individual, the enhanced death benefit applies
only for the death of the Contract  owner. If the Contract owner is not a living
individual,  the  enhanced  death  benefit  applies  only  for the  death of the
Annuitant.  For  Contracts  with the Enhanced  Death  Benefit  Rider,  the death
benefit will be the greatest of (1) through (4) above, or (5) the enhanced death
benefit.  The enhanced  death benefit is equal to the greater of Enhanced  Death
Benefit A or  Enhanced  Death  Benefit B.  Enhanced  Death  Benefit B may not be
available in all states.

                                       32
<PAGE>

The enhanced  death benefit will never be greater than the maximum death benefit
allowed by any nonforfeiture laws which govern the Contract.

Enhanced  Death  Benefit A. The  Enhanced  Death  Benefit A on the Issue Date is
equal to the initial purchase  payment.  On each Contract  Anniversary,  we will
recalculate  your Enhanced Death Benefit A to equal the greater of your Contract
Value on that date, or the most recently calculated Enhanced Death Benefit A. We
also  will  recalculate  your  Enhanced  Death  Benefit A  whenever  you make an
additional  purchase  payment  or  a  partial  withdrawal.  Additional  purchase
payments  will  increase  the  Enhanced   Death  Benefit  A   dollar-for-dollar.
Withdrawals  will reduce the  Enhanced  Death  Benefit A by an amount equal to a
withdrawal  adjustment  computed  in the manner  described  above  under  "Death
Benefit  Amount." In the absence of any  withdrawals or purchase  payments,  the
Enhanced  Death  Benefit  A will be the  greatest  of all  Contract  Anniversary
Contract Values on or before the date we calculate the death benefit.

We will calculate  Anniversary Values for each Contract Anniversary prior to the
oldest Contract  owner's or, if the Contract owner is not a natural person,  the
oldest Annuitant's 85th birthday. After age 85, we will recalculate the Enhanced
Death Benefit A only for purchase payments and withdrawals.

Enhanced  Death  Benefit  B.  The  Enhanced  Death  Benefit  B is equal to total
purchase payments made reduced by a withdrawal adjustment computed in the manner
described  above under "Death  Benefit  Amount." Each purchase  payment and each
withdrawal  adjustment will accumulate daily at a rate equivalent to 5% per year
until the earlier of the date

  . we determine the death benefit, or

  . the first day of the month following the oldest Contract  owner's or, if the
    Contract  owner  is  not a  natural  person,  the  oldest  Annuitant's  85th
    birthday.

DEATH BENEFIT PAYMENTS

Death of Contract Owner. Within 180 days of the date of your death, the new
Contract Owner may elect to:

  1) receive the death benefit in a lump sum, or

  2) apply an amount equal to the death benefit to one of the  available  Income
  Plans  described  above.  The Payout Start Date must be within one year of the
  date of your death. Income payments must be:

    (a) over the life of the new Contract Owner,

    (b) for a guaranteed number of payments from 5 to 30 years but not to
    exceed the life expectancy of the new Contract Owner, or

    (c) over the life of new Contract Owner with a guaranteed number of payments
    from 5 to 30 years but not to exceed the life expectancy of the new Contract
    Owner.

Otherwise,  the new  Contract  Owner will  receive  the  Settlement  Value.  The
"Settlement Value" is the Contract Value, less any applicable withdrawal charge,
market value adjustment,  taxes, and contract  maintenance charge. The new Owner
may make a single  withdrawal of any amount within the year of the date of death
without incurring a withdrawal charge. We will calculate the Settlement Value as
of the end of the Valuation Date coinciding with the requested distribution date
for payment or on the mandatory  distribution  date of 5 years after the date of
your death,  whichever is earlier.  If we receive a request after 3 p.m. Central
Time on a  Valuation  Date,  we will  process  the  request as of the end of the
following  Valuation  Date. We are currently  waiving the 180 day limit,  but we
reserve the right to enforce the limitation in the future.

In any event,  the entire value of the  Contract  must be  distributed  within 5
years  after the date of death  unless an Income  Plan is elected or a surviving
spouse continues the Contract in accordance with the provisions described below.

If the  surviving  spouse of the  deceased  Contract  owner is the new  Contract
owner, then the spouse may elect one of the options listed above or may continue
the Contract in the Accumulation Phase as if the death had not

                                       33
<PAGE>

occurred.  The Contract may only be continued once. If the Contract is continued
in the Accumulation  Phase, the surviving spouse may make a single withdrawal of
any amount within one year of the date of death  without  incurring a withdrawal
charge or a Market Value Adjustment.  On the day the Contract is continued,  the
Contract  Value will be the death benefit on the Valuation Date after we receive
due proof of death (the next  Valuation  Date if we  receive  due proof of death
after 3 p.m. Central Time). Prior to the Payout Start Date, the death benefit of
the continued Contract will be the greater of:

  (a) the sum of all purchase payments less any withdrawals, as defined in
  the death benefit provision,

  (b) the Contract Value on the date we determine the death benefit, or

  (c) the Contract Value on the Death Benefit  anniversary  prior to the date we
  determine  the Death  Benefit,  increased by any purchase  payments made since
  that Death  Benefit  Anniversary  and reduced by a withdrawal  adjustment,  as
  defined under Death Benefit Amount.

If the new Contract Owner is a corporation,  trust, or other non-natural person,
then the new Contract Owner may elect, within 180 days of your death, to receive
the death benefit in a lump sum or may elect to receive the Settlement  Value in
a lump sum within 5 years of death. We are currently  waiving the 180 day limit,
but we reserve the right to enforce  the  limitation  in the future.  If any new
Contract owner is a non-natural person, we will consider all new Contract owners
to be non-natural persons for purposes of the above.

Death of Annuitant.  If the  Annuitant  who is not also the Contract  Owner dies
prior to the  Payout  Start  Date,  the  Contract  Owner  must  elect one of the
applicable options described below.

If the  Contract  Owner is a natural  person,  the  Contract  Owner may elect to
continue  the Contract as if the death had not  occurred,  or, if we receive Due
Proof  of  Death  within  180 days of the  date of the  Annuitant's  death,  the
Contract Owner may choose to:

  1) receive the death benefit in a lump sum; or

  2) apply the death  benefit to an Income Plan that must begin within 1 year of
  the date of death.

If the  Contract  Owner  elects to continue  the  Contract or to apply the death
benefit to an Income  Plan,  the new  Annuitant  will be the  youngest  Contract
Owner, unless the Contract Owner names a different Annuitant.

If the Contract Owner is a non-natural  person,  the non-natural  Contract Owner
may elect,  within 180 days of the  Annuitant's  date of death,  to receive  the
death benefit in a lump sum or may elect to receive the Settlement Value payable
in a lump  sum  within  5  years  of  the  Annuitant's  date  of  death.  If the
non-natural  Contract Owner does not make one of the above described  elections,
the Settlement  Value must be withdrawn by the non-natural  Contract Owner on or
before the mandatory  distribution date 5 years after the Annuitant's  death. We
are currently waiving the 180 day limit, but we reserve the right to enforce the
limitation in the future.

                                       34
<PAGE>

MORE INFORMATION
--------------------------------------------------------------------------------

GLENBROOK

Glenbrook is the issuer of the  Contract.  Glenbrook  is a stock life  insurance
company  organized  under the laws of the State of Arizona in 1998.  Previously,
Glenbrook  was  organized  under  the  laws of the  State of  Illinois  in 1992.
Glenbrook  was  originally  organized  under the laws of the State of Indiana in
1965.  From 1965 to 1983 Glenbrook was known as "United  Standard Life Assurance
Company"  and from 1983 to 1992 as  "William  Penn  Life  Assurance  Company  of
America."

Glenbrook is  currently  licensed to operate in the District of Columbia and all
states except New York.  We intend to offer the Contract in those  jurisdictions
in which we are  licensed.  Our  headquarters  is located at 3100 Sanders  Road,
Northbrook, Illinois, 60062.

Glenbrook  is a wholly  owned  subsidiary  of Allstate  Life  Insurance  Company
("Allstate Life"), a stock life insurance company incorporated under the laws of
the State of Illinois.  Allstate  Life is a wholly owned  subsidiary of Allstate
Insurance Company,  a stock  property-liability  insurance company  incorporated
under the laws of the State of Illinois. All of the outstanding capital stock of
Allstate Insurance Company is owned by The Allstate Corporation.

Glenbrook and Allstate Life entered into a reinsurance  agreement effective June
5, 1992. Under the reinsurance agreement,  Allstate Life reinsures substantially
all of  Glenbrook's  liabilities  under its  various  insurance  contracts.  The
reinsurance  agreement  provides us with  financial  backing from Allstate Life.
However, it does not create a direct contractual  relationship  between Allstate
Life and you.  In other  words,  the  obligations  of  Allstate  Life  under the
reinsurance agreement are to Glenbrook; Glenbrook remains the sole obligor under
the Contract to you.

Several  independent  rating agencies  regularly evaluate life insurers' claims-
paying ability, quality of investments, and overall stability. A.M. Best Company
assigns A+  (Superior) to Allstate  Life which  automatically  reinsures all net
business of Glenbrook.  A.M.  Best Company also assigns  Glenbrook the rating of
A+(r) because Glenbrook  automatically  reinsures all net business with Allstate
Life.  Standard & Poor's  Insurance Rating Services assigns an AA+ (Very Strong)
financial  strength  rating and  Moody's  assigns an Aa2  (Excellent)  financial
strength rating to Glenbrook.  Glenbrook  shares the same ratings of its parent,
Allstate Life.  These ratings do not reflect the  investment  performance of the
Variable Account.  We may from time to time advertise these ratings in our sales
literature.

THE VARIABLE ACCOUNT

Glenbrook  established the Glenbrook Life and Annuity Company Separate Account A
on September 6, 1995. We have registered the Variable  Account with the SEC as a
unit investment trust. The SEC does not supervise the management of the Variable
Account or Glenbrook.

We own the assets of the Variable Account.  The Variable Account is a segregated
asset  account  under  Arizona  law.  That  means we  account  for the  Variable
Account's  income,  gains and losses  separately  from the  results of our other
operations.  It also means that only the assets of the Variable Account that are
in excess of the reserves  and other  Contract  liabilities  with respect to the
Variable  Account are subject to liabilities  relating to our other  operations.
Our obligations arising under the Contracts are general corporate obligations of
Glenbrook.

The Variable Account consists of 17 Variable Sub-Accounts, each of which invests
in a corresponding  Fund. We may add new Variable  Sub-Accounts or eliminate one
or more of them,  if we believe  marketing,  tax, or  investment  conditions  so
warrant. We may also add other variable sub-accounts that may be available under

                                       35
<PAGE>

other variable annuity contracts. We do not guarantee the investment performance
of the Variable Account,  its Sub-Accounts or the Funds. We may use the Variable
Account to fund our other annuity contracts. We will account separately for each
type of annuity contract funded by the Variable Account.

THE FUNDS

Dividends  and  Capital  Gain  Distributions.   We  automatically  reinvest  all
dividends  and  capital  gains  distributions  from the  Funds in  shares of the
distributing Funds at their net asset value.

Voting  Privileges.  As a general matter, you do not have a direct right to vote
the  shares of the Funds  held by the  Variable  Sub-Accounts  to which you have
allocated your Contract Value.  Under current law, however,  you are entitled to
give us  instructions on how to vote those shares on certain  matters.  Based on
our  present  view of the law, we will vote the shares of the Funds that we hold
directly  or  indirectly   through  the  Variable  Account  in  accordance  with
instructions  that we  receive  from  Contract  owners  entitled  to  give  such
instructions.

As a general rule,  before the Payout Start Date,  the Contract  owner or anyone
with a voting interest is the person entitled to give voting  instructions.  The
number of shares that a person has a right to  instruct  will be  determined  by
dividing the Contract Value allocated to the applicable Variable  Sub-Account by
the net asset value per share of the corresponding Fund as of the record date of
the meeting.  After the Payout Start Date, the person  receiving income payments
has the voting  interest.  The  payee's  number of votes will be  determined  by
dividing the reserve for such Contract  allocated to the applicable  Sub-account
by the net asset value per share of the  corresponding  eligible Fund. The votes
decrease  as  income  payments  are made and as the  reserves  for the  Contract
decrease.

We will vote shares  attributable  to  Contracts  for which we have not received
instructions, as well as shares attributable to us, in the same proportion as we
vote shares for which we have received instructions, unless we determine that we
may vote such shares in our own discretion. We will apply voting instructions to
abstain  on any item to be voted  upon on a  pro-rata  basis to reduce the votes
eligible  to be cast.  We  reserve  the right to vote Fund  shares as we see fit
without  regard to voting  instructions  to the extent  permitted  by law. If we
disregard voting instructions,  we will include a summary of that action and our
reasons for that action in the next semi-annual financial report we send to you.

Changes in Funds. If the shares of any of the Funds are no longer  available for
investment by the Variable Account or if, in our judgment, further investment in
such shares is no longer  desirable in view of the purposes of the Contract,  we
may eliminate that Fund and  substitute  shares of another  eligible  investment
fund. Any  substitution of securities  will comply with the  requirements of the
1940 Act. We also may add new Variable  Sub-Accounts  that invest in  additional
mutual funds. We will notify you in advance of any change.

Conflicts  of  Interest.  The  Funds  sell  their  shares to  separate  accounts
underlying both variable life insurance and variable  annuity  contracts.  It is
conceivable that in the future it may be unfavorable for variable life insurance
separate  accounts and variable annuity separate  accounts to invest in the same
Fund. The board of directors of the Funds monitors for possible  conflicts among
separate  accounts  buying  shares of the Funds.  Conflicts  could develop for a
variety of reasons.  For example,  differences in treatment  under tax and other
laws or the failure by a separate account to comply with such laws could cause a
conflict.  To eliminate a conflict,  the Funds' board of directors may require a
separate  account to withdraw  its  participation  in a Fund. A Fund's net asset
value could decrease if it had to sell  investment  securities to pay redemption
proceeds to a separate account withdrawing because of a conflict.

THE CONTRACT

Distribution.  ALFS, Inc.* ("ALFS"),  located at 3100 Sanders Road,  Northbrook,
Illinois 60062-7154, serves as principal underwriter of the Contracts. ALFS is a
wholly owned  subsidiary of Allstate  Life.  ALFS is a registered  broker dealer
under the Securities and Exchange Act of 1934, as amended  ("Exchange Act"), and
is a member of the National Association of Securities Dealers, Inc.

----------------
*  Effective May 1, 2000, Allstate Life Financials Services, Inc. was renamed
   ALFS, Inc.

                                       36
<PAGE>

We will pay commissions to  broker-dealers  who sell the Contracts.  Commissions
paid may vary, but we estimate that the total  commissions  paid on all Contract
sales will not exceed 8% of all purchase  payments (on a present  value  basis).
These commissions are intended to cover  distribution  expenses.  Sometimes,  we
also pay the  broker-dealer  a  persistency  bonus in addition  to the  standard
commissions.  A persistency  bonus is not expected to exceed 1.20%, on an annual
basis, of the Contract Values  considered in connection with the bonus.  Sale of
the Contracts may also count toward incentive  program awards for the registered
representative.  In some states,  Contracts  may be sold by  representatives  or
employees  of banks  which  may be  acting as  broker-dealers  without  separate
registration   under  the  Exchange  Act,   pursuant  to  legal  and  regulatory
exceptions.

Glenbrook does not pay ALFS a commission for distribution of the Contracts.  The
underwriting  agreement  with ALFS provides that we will  reimburse ALFS for any
liability  to Contract  owners  arising out of  services  rendered or  Contracts
issued.

Administration. We have primary responsibility for all administration of the
Contracts and the Variable Account. We provide the following administrative
services, among others:

  . issuance of the Contracts;

  . maintenance of Contract owner records;

  . Contract owner services;

  . calculation of unit values;

  . maintenance of the Variable Account; and

  . preparation of Contract owner reports.

We will send you Contract  statements  at least  annually.  You should notify us
promptly in writing of any address  change.  You should read your statements and
confirmations  carefully  and  verify  their  accuracy.  You  should  contact us
promptly if you have a question about a periodic statement.  We will investigate
all complaints and make any necessary  adjustments  retroactively,  but you must
notify us of a potential  error within a  reasonable  time after the date of the
questioned  statement.  If you wait too long,  we reserve  the right to make the
adjustment as of the date that we receive notice of the potential error.

We also will provide you with additional periodic and other reports, information
and prospectuses as may be required by federal securities laws.

QUALIFIED PLANS

If you use the Contract with a qualified plan, the plan may impose  different or
additional  conditions  or  limitations  on  withdrawals,  waivers of withdrawal
charges, death benefits, Payout Start Dates, income payments, and other Contract
features.  In addition,  adverse tax  consequences  may result if qualified plan
limits on  distributions  and other  conditions are not met. Please consult your
qualified plan administrator for more information.

LEGAL MATTERS

Freedman,  Levy,  Kroll & Simonds,  Washington,  D.C., has advised  Glenbrook on
certain federal  securities law matters.  All matters of state law pertaining to
the Contracts,  including the validity of the Contracts and Glenbrook's right to
issue such Contracts under state insurance law, have been passed upon by Michael
J. Velotta, General Counsel of Glenbrook.

YEAR 2000

Glenbrook is heavily  dependent upon complex  computer systems for all phases of
its   operations,   including   customer   service,   and  policy  and  contract
administration.  Since many of  Glenbrook's  older  computer  software  programs
recognize  only the last two digits of the year in any date,  some  software may
have failed to operate

                                       37
<PAGE>

properly in or after the year 1999,  if the  software  was not  reprogrammed  or
replaced ("Year 2000 Issue"). Glenbrook believes that many of its counterparties
and suppliers also had potential Year 2000 Issues which could affect  Glenbrook.
In 1995,  Allstate  Insurance  Company  commenced a four phase plan  intended to
mitigate  and/or  prevent  the  adverse  effects  of  Year  2000  Issues.  These
strategies  included  normal  development  and  enhancement  of new and existing
systems,   upgrades  to  operating   systems   already  covered  by  maintenance
agreements,  and  modifications  to  existing  systems  to make  them  Year 2000
compliant.  The plan also  included  Glenbrook  actively  working with its major
external  counterparties  and suppliers to assess their  compliance  efforts and
Glenbrook's  exposure to them.  Because of the  accuracy  of this plan,  and its
timely completion,  Glenbrook has experienced no material impacts on its results
of operations,  liquidity or financial position due to the Year 2000 issue. Year
2000 costs are expensed as incurred.

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<PAGE>

TAXES
--------------------------------------------------------------------------------

The following discussion is general and is not intended as tax advice. Glenbrook
makes no guarantee  regarding the tax  treatment of any Contract or  transaction
involving a Contract.

Federal,  state,  local and other tax  consequences  of  ownership or receipt of
distributions under an annuity contract depend on your individual circumstances.
If you are concerned about any tax  consequences  with regard to your individual
circumstances, you should consult a competent tax adviser.

TAXATION OF ANNUITIES IN GENERAL

Tax Deferral. Generally, you are not taxed on increases in the Contract Value
until a distribution occurs. This rule applies only where:

  1) the Contract owner is a natural person,

  2) the investments of the Variable Account are "adequately diversified"
  according to Treasury Department regulations, and

  3)  Glenbrook  is  considered  the owner of the  Variable  Account  assets for
  federal income tax purposes.

Non-natural  Owners.  As a general rule,  annuity contracts owned by non-natural
persons  such as  corporations,  trusts,  or other  entities  are not treated as
annuity contracts for federal income tax purposes.  The income on such contracts
is taxed as ordinary  income received or accrued by the owner during the taxable
year.  Please see the  Statement of Additional  Information  for a discussion of
several  exceptions  to the  general  rule for  Contracts  owned by  non-natural
persons.

Diversification  Requirements.  For a Contract  to be treated as an annuity  for
federal income tax purposes,  the  investments  in the Variable  Account must be
"adequately  diversified"  consistent with standards  under Treasury  Department
regulations.  If the  investments  in the  Variable  Account are not  adequately
diversified, the Contract will not be treated as an annuity contract for federal
income tax  purposes.  As a result,  the income on the Contract will be taxed as
ordinary  income  received or accrued by the  Contract  owner during the taxable
year. Although Glenbrook does not have control over the Funds their investments,
we expect the Funds to meet the diversification requirements.

Ownership Treatment. The IRS has stated that you will be considered the owner of
Variable  Account assets if you possess  incidents of ownership in those assets,
such as the ability to exercise  investment control over the assets. At the time
the diversification  regulations were issued, the Treasury Department  announced
that the regulations do not provide guidance  concerning  circumstances in which
investor  control of separate  account  investments  may cause an investor to be
treated as the owner of the  separate  account.  The  Treasury  Department  also
stated that future  guidance  would be issued  regarding  the extent that owners
could direct  sub-account  investments  without  being  treated as owners of the
underlying assets of the separate account.

Your rights under the Contract are different than those  described by the IRS in
rulings  in which it found that  contract  owners  were not  owners of  separate
account  assets.  For  example,  you have the choice to  allocate  premiums  and
Contract  Values among more  investment  alternatives.  Also, you may be able to
transfer among  investment  alternatives  more  frequently than in such rulings.
These differences could result in you being treated as the owner of the Variable
Account. If this occurs,  income and gain from the Variable Account assets would
be includible in your gross income.  Glenbrook does not know what standards will
be set forth in any  regulations  or rulings which the Treasury  Department  may
issue. It is possible that future standards announced by the Treasury Department
could adversely affect the tax treatment of your Contract.  We reserve the right
to modify the  Contract  as  necessary  to  attempt  to  prevent  you from being
considered the federal tax owner of the assets of the Variable Account. However,
we make no guarantee that such modification to the Contract will be successful.

                                       39
<PAGE>

Taxation of Partial and Full Withdrawals. If you make a partial withdrawal under
a  non-Qualified  Contract,  amounts  received  are  taxable  to the  extent the
Contract Value,  without regard to surrender charges,  exceeds the investment in
the Contract.  The  investment in the Contract is the gross premium paid for the
Contract minus any amounts previously received from the Contract if such amounts
were properly excluded from your gross income. If you make a partial  withdrawal
under a Qualified Contract, the portion of the payment that bears the same ratio
to the total payment that the  investment in the Contract  (i.e.,  nondeductible
IRA  contributions,  after tax  contributions  to qualified  plans) bears to the
Contract  Value,  is excluded  from your income.  If you make a full  withdrawal
under a non-Qualified Contract or a Qualified Contract, the amount received will
be taxable only to the extent it exceeds the investment in the Contract.

"Nonqualified   distributions"   from  Roth  IRAs  are   treated  as  made  from
contributions  first and are  included  in gross  income only to the extent that
distributions exceed contributions. "Qualified distributions" from Roth IRAs are
not included in gross income.  "Qualified  distributions"  are any distributions
made more than 5 taxable years after the taxable year of the first  contribution
to any Roth IRA and which are:

  . made on or after the date the individual attains age 59 1/2,

  . made to a beneficiary after the Contract owner's death,

  . attributable to the Contract owner being disabled, or

  . for a first time home purchase  (first time home  purchases are subject to a
    lifetime limit of $10,000).

If you transfer a non-Qualified Contract without full and adequate consideration
to a person  other  than  your  spouse  (or to a  former  spouse  incident  to a
divorce), you will be taxed on the difference between the Contract Value and the
investment in the Contract at the time of transfer. Except for certain Qualified
Contracts, any amount you receive as a loan under a Contract, and any assignment
or pledge (or agreement to assign or pledge) of the Contract Value is treated as
a withdrawal of such amount or portion.

Taxation of Annuity Payments. Generally, the rule for income taxation of annuity
payments received from a non-Qualified  Contract provides for the return of your
investment in the Contract in equal  tax-free  amounts over the payment  period.
The balance of each payment received is taxable. For fixed annuity payments, the
amount  excluded  from income is determined  by  multiplying  the payment by the
ratio of the  investment  in the Contract  (adjusted  for any refund  feature or
period certain) to the total expected value of annuity  payments for the term of
the Contract.  If you elect variable annuity payments,  the amount excluded from
taxable  income is determined by dividing the  investment in the Contract by the
total number of expected  payments.  The annuity  payments will be fully taxable
after the total amount of the investment in the Contract is excluded using these
ratios.  If you die, and annuity  payments  cease before the total amount of the
investment in the Contract is recovered,  the unrecovered amount will be allowed
as a deduction for your last taxable year.

Taxation of Annuity Death  Benefits.  Death of a Contract owner, or death of the
Annuitant  if the  Contract  is  owned by a  non-natural  person,  will  cause a
distribution  of death  benefits  from a Contract.  Generally,  such amounts are
included in income as follows:

  1) if distributed in a lump sum, the amounts are taxed in the same manner
  as a full withdrawal, or

  2) if distributed  under an annuity option,  the amounts are taxed in the same
  manner  as  an  annuity  payment.  Please  see  the  Statement  of  Additional
  Information for more detail on distribution at death requirements.

Penalty Tax on Premature Distributions. A 10% penalty tax applies to the taxable
amount of any premature distribution from a non-Qualified  Contract. The penalty
tax generally  applies to any distribution made prior to the date you attain age
59 1/2. However, no penalty tax is incurred on distributions:

  1) made on or after the date the Contract owner attains age 59 1/2;

  2) made as a result of the Contract owner's death or disability;

  3) made in substantially equal periodic payments over the Contract owner's
  life or life expectancy,

                                       40
<PAGE>

  4) made under an immediate annuity, or

  5) attributable to investment in the Contract before August 14, 1982.

You should consult a competent tax advisor to determine if any other  exceptions
to the  penalty  apply  to your  situation.  Similar  exceptions  may  apply  to
distributions from Qualified Contracts.

Aggregation of Annuity Contracts.  All non-qualified  deferred annuity contracts
issued by Glenbrook (or its  affiliates)  to the same Contract  owner during any
calendar  year will be  aggregated  and  treated  as one  annuity  contract  for
purposes of determining the taxable amount of a distribution.

TAX QUALIFIED CONTRACTS

Contracts may be used as investments with certain qualified plans such as:

  . Individual Retirement Annuities or Accounts (IRAs) under Section 408 of
    the Code;

  . Roth IRAs under Section 408A of the Code;

  . Simplified Employee Pension Plans under Section 408(k) of the Code;

  . Savings Incentive Match Plans for Employees (SIMPLE) Plans under Section
    408(p) of the Code;

  . Tax Sheltered Annuities under Section 403(b) of the Code;

  . Corporate and Self Employed Pension and Profit Sharing Plans; and

  . State and Local Government and Tax Exempt Organization Deferred
    Compensation Plans.

The income on qualified  plan and IRA  investments  is tax deferred and variable
annuities  held by such plans do not receive any  additional  tax deferral.  You
should review the annuity features,  including all benefits and expenses,  prior
to purchasing a variable annuity in a qualified plan or IRA.  Glenbrook reserves
the  right to limit the  availability  of the  Contract  for use with any of the
Qualified Plans listed above. In the case of certain  qualified plans, the terms
of the plans may govern the right to  benefits,  regardless  of the terms of the
Contract.

Restrictions  Under Section  403(b) Plans.  Section  403(b) of the Code provides
tax-deferred  retirement  savings plans for employees of certain  non-profit and
educational organizations.  Under Section 403(b), any Contract used for a 403(b)
plan  must  provide  that   distributions   attributable  to  salary   reduction
contributions made after December 31, 1988, and all earnings on salary reduction
contributions, may be made only:

  1) on or after the date of employee

    . attains age 59 1/2,

    . separates from service,

    . dies,

    . becomes disabled; or

  2) on account of hardship (earnings on salary reduction  contributions may not
  be distributed on account of hardship).

These  limitations  do not apply to withdrawals  where  Glenbrook is directed to
transfer some or all of the Contract Value to another 403(b) plan.

INCOME TAX WITHHOLDING

Glenbrook  is required to  withhold  federal  income tax at a rate of 20% on all
"eligible rollover  distributions"  unless you elect to make a "direct rollover"
of  such  amounts  to an IRA or  eligible  retirement  plan.  Eligible  rollover
distributions  generally  include all  distributions  from Qualified  Contracts,
excluding IRAs, with the exception of:

  1) required minimum distributions, or

                                       41
<PAGE>

  2) a series of substantially equal periodic payments made over a period of
  at least 10 years, or

  3) over the life (joint lives) of the participant (and beneficiary).

Glenbrook  may be  required to withhold  federal and state  income  taxes on any
distributions from non-Qualified  Contracts or Qualified  Contracts that are not
eligible  rollover  distributions,  unless you notify us of your election to not
have taxes withheld.

                                       42
<PAGE>

ANNUAL REPORTS AND OTHER DOCUMENTS
--------------------------------------------------------------------------------

Glenbrook's  annual report on Form 10-K for the year ended December 31, 1999 and
quarterly  report on 10-Q for the quarter ended March 31, 2000 are  incorporated
herein by reference, which means that it is legally a part of this prospectus.

After the date of this  prospectus  and before we terminate  the offering of the
securities under this prospectus,  all documents or reports we file with the SEC
under the Exchange Act are also  incorporated  herein by reference,  which means
that they also legally become a part of this prospectus.

Statements in this  prospectus,  or in documents that we file later with the SEC
and that  legally  become a part of this  prospectus,  may  change or  supersede
statements  in  other  documents  that  are  legally  part of  this  prospectus.
Accordingly,  only the  statement  that is changed or replaced will legally be a
part of this prospectus.

We file our  Exchange  Act  documents  and  reports,  including  our  annual and
quarterly reports on Form 10-K and Form 10-Q electronically on the SEC's "EDGAR"
system using the identifying number CIK No. 0000947878.  The SEC maintains a Web
site  that  contains  reports,   proxy  and  information  statements  and  other
information  regarding  registrants that file  electronically  with the SEC. The
address of the site is http://www.sec.gov.  You also can view these materials at
the SEC's Public  Reference  Room at 450 Fifth Street,  N.W.,  Washington,  D.C.
20549.  For more  information on the operations of SEC's Public  Reference Room,
call 1-800-SEC-0330.

If you have  received a copy of this  prospectus,  and would like a free copy of
any  document   incorporated  herein  by  reference  (other  than  exhibits  not
specifically incorporated by reference into the text of such documents),  please
write or call us at P.O. Box 94039,  Palatine,  Illinois 60094-4039  (telephone:
1-800-776-6978).

                                       43
<PAGE>

PERFORMANCE INFORMATION
--------------------------------------------------------------------------------

We may advertise the performance of the Variable  Sub-Accounts,  including yield
and total  return  information.  Yield  refers  to the  income  generated  by an
investment  in a Variable  Sub-Account  over a specified  period.  Total  return
represents  the  change,  over a  specified  period of time,  in the value of an
investment in a Variable Sub-Account after reinvesting all income distributions.

All performance  advertisements will include, as applicable,  standardized yield
and total return figures that reflect the Credit  Enhancement  and the deduction
of insurance charges,  the contract  maintenance  charge, and withdrawal charge.
Performance  advertisements  also may include total return  figures that reflect
the  deduction  of  insurance  charges,  but not  the  contract  maintenance  or
withdrawal  charges.  However,  any total return figures that reflect the Credit
Enhancement  will also  reflect  applicable  withdrawal  charges  to the  extent
required.  The deduction of such charges would reduce the performance  shown. In
addition,  performance  advertisements may include aggregate,  average, year-by-
year, or other types of total return figures.

Performance  information for periods prior to the inception date of the Variable
Sub-Accounts  will be based on the historical  performance of the  corresponding
Funds  for the  periods  beginning  with the  inception  dates of the  Funds and
adjusted to reflect current  Contract  expenses.  You should not interpret these
figures to reflect actual historical performance of the Variable Account.

We may include in  advertising  and sales  materials  tax  deferred  compounding
charts and other  hypothetical  illustrations that compare currently taxable and
tax  deferred   investment   programs  based  on  selected  tax  brackets.   Our
advertisements  also may compare the  performance  of our Variable  Sub-Accounts
with: (a) certain unmanaged market indices, including but not limited to the Dow
Jones  Industrial  Average,  the Standard & Poor's 500, and the Shearson  Lehman
Bond Index;  and/or (b) other  management  investment  companies with investment
objectives  similar to the underlying  funds being  compared.  In addition,  our
advertisements   may  include  the  performance   ranking  assigned  by  various
publications,  including  the  Wall  Street  Journal,  Forbes,  Fortune,  Money,
Barron's,  Business Week, USA Today, and statistical services,  including Lipper
Analytical  Services  Mutual Fund Survey,  Lipper Annuity and Closed End Survey,
the Variable Annuity Research Data Survey, and SEI.

                                       44
<PAGE>

EXPERTS
--------------------------------------------------------------------------------

The  financial  statements of Glenbrook as of December 31, 1999 and 1998 and for
each of the three years in the period  ended  December  31, 1999 and the related
financial  statement  schedule  that  appear  in  the  Statement  of  Additional
Information have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their report appearing  herein,  and have been so included in reliance
upon the report of such firm given upon their authority as experts in accounting
and auditing.

The financial  statements of the Variable  Account as of December 31, 1999,  and
for  each of the  periods  in the two  years  then  ended  that  appear  in this
Statement of Additional  Information have been audited by Deloitte & Touche LLP,
independent  auditors, as stated in their report appearing herein, and have been
so included in reliance upon the report of such firm given upon their  authority
as experts in accounting and auditing.

                                       45
<PAGE>

                                   APPENDIX A

                             MARKET VALUE ADJUSTMENT

The Market Value Adjustment is based on the following:

  I = the Treasury Rate for a maturity equal to the applicable  Guarantee Period
  for the week preceding the establishment of the Guarantee Period.

  N = the  number  of whole  and  partial  years  from the date we  receive  the
  withdrawal, transfer, or death benefit request, or from the Payout Start Date,
  to the end of the Guarantee Period; and

  J = the Treasury  Rate for a maturity  equal to the  Guarantee  Period for the
  week preceding the receipt of the  withdrawal,  transfer,  death  benefit,  or
  income payment request. If a note for a maturity of length N is not available,
  a weighted average will be used.

  "Treasury  Rate"  means the U.S.  Treasury  Note  Constant  Maturity  Yield as
  reported in Federal Reserve Bulletin Release H.15.

The Market Value Adjustment factor is determined from the following formula:

                                 .9 X (I-J) X N

To determine  the Market  Value  Adjustment,  we will  multiply the Market Value
Adjustment  factor by the amount  transferred,  withdrawn (in excess of the Free
Withdrawal Amount),  paid as a death benefit, or applied to an Income Plan, from
a Guarantee  Period at any time other than  during the 30 day period  after such
Guarantee Period expires.

                       EXAMPLES OF MARKET VALUE ADJUSTMENT

<TABLE>
<S>                               <C>
Purchase Payment of $10,000 Plus
     Credit Enhancement of $400
     (Option 1: 4% up front):     $10,400 allocated to a Guarantee Period

Guarantee Period:                 5 years

Treasury Rate (at the time the
     Guarantee Period
     was established):            4.50%

Full Surrender:                   End of Contract Year 3
</TABLE>

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

NOTE: These examples assume that premium taxes are not applicable.

                                       46
<PAGE>

                 EXAMPLE 1: (Assumes declining interest rates)


<TABLE>
<S>                         <C>
Step 1. Calculate Contract
        Value at End of
        Contract Year 3:    $10,000.00 X (1.04) X (1.045)/3/ = $11,868.13

Step 2. Calculate the Free
        Withdrawal Amount:  15% X $10,000.00 X (1.04) X (1.045)/2/ = $1,703.56

Step 3. Calculate the
        Withdrawal Charge:  = .07 X ($10,000.00 - $1,703.56) = $580.75

Step 4. Calculate the
        Market Value
        Adjustment:         I = 4.50%

                            J= 4.20%

                            730 days
                            --------
                            N = 365 days = 2

                            Market Value Adjustment Factor: .9 X (I - J) X N

                            = .9 X (.045 - .042) X (2) = 0.0054

                            Market Value Adjustment = Market Value
                            Adjustment Factor X Amount Subject to
                             Market Value Adjustment

                            = .0054 X ($11,868.13 - $1,703.56) = $54.89

Step 5. Calculate the
        amount received by
        Contract owner as
        a result of full
        withdrawal at the
        end of Contract
        Year 3:             $11,868.13 - $580.75 + $54.89 = $11,342.27
</TABLE>

                   EXAMPLE 2: (Assumes rising interest rates)

<TABLE>
<S>                         <C>
Step 1. Calculate Contract
        Value at End of
        Contract Year 3:    $10,000.00 X (1.04) X (1.045)/3/ = $11,868.13

Step 2. Calculate the Free
        Withdrawal Amount:  15% X $10,000.00 X (1.04) X (1.045)/2/ = $1,703.56

Step 3. Calculate the
        Withdrawal Charge:  = .07 X ($10,000.00 - $1,703.56) = $580.75

Step 4. Calculate the
        Market Value
        Adjustment:         I = 4.50%

                            J= 4.80%

                            730 days
                            --------
                            N = 365 days  = 2

                            Market Value Adjustment Factor: .9 X (I - J) X N

                            = .9 X (.045 - .048) X (2) = -0.0054

                            Market Value Adjustment = Market Value
                            Adjustment Factor X Amount Subject to
                             Market Value Adjustment

                            = .0054 X ($11,868.13 - $1,703.56) = $(54.89)

Step 5. Calculate the
        amount received by
        Contract owner as
        a result of full
        withdrawal at the
        end of Contract
        Year 3:             $11,868.13 - $580.75 - $54.89 = $11,232.49
</TABLE>

                                       47
<PAGE>

                       STATEMENT OF ADDITIONAL INFORMATION

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                Description                                 Page
                                -----------                                 ----
<S>                                                                         <C>
Additions, Deletions or Substitutions of Investments.......................   1
The Contract...............................................................   2
  Purchases................................................................   2
  Tax-free Exchanges (1035 Exchanges, Rollovers and Transfers).............   2
Performance Information....................................................   3
Calculation of Accumulation Unit Values....................................  11
Calculation of Variable Income Payments....................................  12
General Matters
  Incontestability.........................................................  13
  Settlements..............................................................  13
  Safekeeping of the Variable Account's Assets.............................  13
  Premium Taxes............................................................  13
  Tax Reserves.............................................................  13
Federal Tax Matters........................................................  14
Qualified Plans............................................................  15
Experts....................................................................  18
Financial Statements.......................................................  19
</TABLE>

This  prospectus  does not constitute an offering in any  jurisdiction  in which
such offering may not lawfully be made.  We do not  authorize  anyone to provide
any  information  or  representations  regarding the offering  described in this
prospectus other than as contained in this prospectus.

                                       48


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