AMERICAN CENTURY QUANTITATIVE EQUITY FUNDS
497K3B, 1999-01-19
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                                  FUND PROFILE

                                 Income & Growth

                                 INVESTOR CLASS

                                January 15, 1999

                        [american century logo (reg.sm)]
                                    American
                                    Century

- --------------------------------------------------------------------------------
This profile  summarizes key information  about the fund that is included in the
fund's Prospectus. The fund's Prospectus has additional information about the
   fund, including a more detailed description of  the risks associated with
investing in the fund, that you may want  to consider before you invest. You may
   obtain the Prospectus and other  information about the fund at no cost by
 calling us at 1-800-345-2021,  accessing our Web site or visiting one of our
Investor Centers.  See the back cover for additional telephone numbers and our
                                   address.

                             AMERICAN CENTURY GROUP


                          AMERICAN CENTURY INVESTMENTS

                                 INCOME & GROWTH

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

        Income & Growth  seeks  dividend  growth,  current  income  and  capital
     appreciation by investing in common stocks.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

        The  fund's  investment   strategy  utilizes   quantitative   management
     techniques in a two-step process that draws heavily on computer technology.
     In the first step,  the fund  managers  rank  stocks,  primarily  the 1,500
     largest  publicly  traded  companies in the United States  (measured by the
     value of their stock),  from most attractive to least  attractive.  This is
     determined by using a computer  model that  combines  measures of a stock's
     value as well as measures of its growth  potential.  To measure value,  the
     fund   managers  use  ratios  of  stock   price-to-book   value  and  stock
     price-to-cash flow, among others. To measure growth, the fund managers use,
     among others, the rate of growth of a company's earnings and changes in the
     earnings estimates for a company.

        In the second step, the fund managers use a technique  called  portfolio
     optimization. With portfolio optimization, the fund managers use a computer
     to build a portfolio  of stocks that they  believe will provide the optimal
     balance  between risk and expected  return of the  portfolio as measured in
     the stock ranking completed in the first step. The goal is to create a fund
     that provides better returns than the S&P 500 without taking on significant
     additional risk. When building the fund's portfolio, the fund managers also
     attempt to create a dividend  yield for the fund that will be greater  than
     that of the S&P 500.

        The fund may invest in securities other than stocks, such as convertible
     securities,  foreign securities,  short-term  instruments and non-leveraged
     stock index futures contracts.  "Non-leveraged" means that the fund may not
     invest in futures  contracts  where it would be  possible to lose more than
     the fund invested.

        Additional  information about Income & Growth's investments is available
     in its annual and  semiannual  reports.  In these  reports  you will find a
     discussion  of  the  market  conditions  and  investment   strategies  that
     significantly affected the fund's performance during the most recent fiscal
     period. You may get these reports at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    *The value of Income &  Growth's  shares  depends on the value of the stocks
     and other  securities it owns. The value of the individual  securities that
     the fund  owns  will go up and down  depending  on the  performance  of the
     companies  that issued them,  general market and economic  conditions,  and
     investor confidence.

    *Market  performance  tends  to be  cyclical,  and  in the  various  cycles,
     certain  investment  styles may fall in and out of favor.  If the market is
     not  favoring the fund's  style,  the fund's gains may not be as big as, or
     its  losses  may  be  bigger  than,  other  equity  funds  using  different
     investment styles.

    *As with all funds,  at any given time, the value of your shares of Income &
     Growth may be worth more or less than the price you paid.  If you sell your
     shares when the value is less than the price you paid, you will lose money.

    *An investment  in the fund is not a bank deposit,  and it is not insured or
     guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other
     government agency.

    *Although  the fund  managers  invest the fund's  assets  primarily  in U.S.
     stocks,  Income & Growth can  invest in  securities  of foreign  companies.
     Foreign securities can have certain unique risks, including fluctuations in
     currency  exchange  rates,  unstable  political  and  economic  structures,
     reduced  availability  of  public  information  and  the  lack  of  uniform
     financial reporting and regulatory practices similar to those that apply to
     U.S. issuers.

        In  summary,  Income  and  Growth is  intended  for  investors  who seek
     dividend growth,  current income and capital appreciation through an equity
     fund and who are  willing  to accept the risks  associated  with the fund's
     investment strategy.

     FUND PERFORMANCE

        The  following  bar  chart  shows  the  actual  performance  of Income &
     Growth's  Investor  Class  shares for each  calendar  year since the fund's
     inception on December 17, 1990.  The bar chart  indicates the volatility of
     the fund's historical  returns from year to year. Neither the bar chart nor
     the performance  information  below it is intended to indicate how the fund
     will perform in the future.


INCOME & GROWTH                                     AMERICAN CENTURY INVESTMENTS

[bar chart]
     -------------------------------------------------------------------------
     CALENDAR YEAR-BY-YEAR RETURNS
     -------------------------------------------------------------------------
     1998      27.67%
     1997      34.45%
     1996      24.15%
     1995      36.87%
     1994      -0.56%
     1993      11.31%
     1992       7.87%
     1991      39.05%

        The highest and lowest returns of the fund's Investor Class shares for a
     calendar quarter during the period reflected by the preceding bar chart are
     provided  in  the  following  chart  to  indicate  the  fund's   historical
     short-term volatility. Shareholders should be aware, however, that Income &
     Growth is intended for investors with a long-term investment horizon and is
     not managed for short-term results.

[bar chart]
     -------------------------------------------------------------------------
     HIGHEST AND LOWEST QUARTERLY RETURNS
     -------------------------------------------------------------------------
     Quarter Ended 12/31/98            22.18%
     Quarter Ended  9/30/98           -11.29%

        The  following  table  shows the  average  annual  return of the  fund's
     Investor  Class  shares for the periods  indicated.  The S&P 500 Index,  an
     unmanaged  index  that  reflects  no  operating  costs,  is  included  as a
     benchmark for performance comparisons.

                                1 YEAR       5 YEARS      LIFE OF FUND
     -------------------------------------------------------------------------
     AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED DECEMBER 31, 1998)
     -------------------------------------------------------------------------
     Income & Growth            27.67%         23.74%         21.88%
     S&P 500 Index              28.68%         24.05%         21.02%

4. WHAT ARE THE FUND'S FEES AND EXPENSES?

        There  are no sales  loads,  fees or other  charges  to buy fund  shares
     directly from American Century, to reinvest dividends in additional shares,
     to exchange into the Investor Class shares of other American  Century funds
     or to redeem  your  shares.  The  following  table  describes  the fees and
     expenses that you will pay if you buy and hold shares of the fund.

     -------------------------------------------------------------------------
      ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
     -------------------------------------------------------------------------
     Management Fee                            0.70%(1)
     Distribution and Service (12b-1) Fees      None
     Other Expenses(2)                         0.01%
     Total Annual Fund Operating Expenses      0.71%

        (1)Based on assets as of December 31,  1998.  The fund has a stepped fee
        schedule.  As a result, the fund's management fee generally decreases as
        fund assets increase.

        (2)Other   expenses   include  the  fees  and  expenses  of  the  fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses.

           EXAMPLE
              Assuming you . . .
              * invest $10,000 in the fund
              * redeem your shares at the end of the periods shown below 
              * earn a 5% return each year 
              * incur the same fund operating expenses shown above
               . . . your cost of investing in the fund would be:

                 1 year           3 years          5 years           10 years
                   $72             $227             $394               $880

               Of course, actual costs may be higher or lower.  Use this example
                 to compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

        American  Century  Investment   Management,   Inc.  provides  investment
     advisory and management  services for the fund. American Century uses teams
     of portfolio  managers,  assistant  portfolio managers and analysts working
     together to manage its mutual funds. The portfolio managers on the Income &
     Growth team are identified as follows:


FUND PROFILE                                                     INCOME & GROWTH


        JOHN SCHNIEDWIND,  Senior Vice President and Group  Leader--Quantitative
     Equity,  has been a member of the team that  manages  Income & Growth since
     its inception.  Mr.  Schniedwind  joined American  Century in 1982 and also
     supervises other portfolio  management  teams. He has a bachelor of science
     from  Purdue  University  and an MBA in  finance  from  the  University  of
     California. He is a Chartered Financial Analyst.

        JEFFREY R. TYLER, Senior Vice President and Portfolio Manager,  has been
     a member of the team that  manages  Income and Growth  since June 1997.  He
     joined American Century as a portfolio manager in 1988. He has a bachelor's
     degree in business  economics  from the University of California and an MBA
     in finance and economics from  Northwestern  University.  He is a Chartered
     Financial Analyst.

6. HOW DO I BUY FUND SHARES?

     * Complete and return the enclosed application

     * Call us and exchange shares from another American Century fund

     * Call us and send your investment by bank wire transfer

        Your initial  investment must be at least $2,500 ($1,000 for traditional
     IRAs, Roth IRAs and UGMA/UTMA accounts),  unless you establish an automatic
     investment  plan of at least $50 per  month.  If the value of your  account
     falls   below  this   account   minimum,   your   shares  may  be  redeemed
     involuntarily.

7. HOW DO I SELL FUND SHARES?

        You may sell all or part of your  fund  shares  on any  business  day by
     writing or calling us. You also may exchange your shares in Income & Growth
     for shares in nearly 70 other  mutual  funds  offered by American  Century.
     Depending  on the  options  you  select  when you open your  account,  some
     restrictions  may apply.  For your  protection,  some  redemption  requests
     require a signature guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

        Income & Growth pays  distributions of  substantially  all of its income
     quarterly. Distributions from realized capital gains are paid twice a year,
     usually in March and  December.  Distributions  may be taxable as  ordinary
     income,  capital gains or a combination of the two. Capital gains are taxed
     at  different  rates  depending  on the  length  of time the fund  held the
     securities that were sold.  Distributions  are reinvested  automatically in
     additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

        American Century offers several ways to make it easier for you to manage
     your account, such as:

     * telephone transactions

     * wire and electronic funds transfers

     * 24-hour Automated Information Line transactions

     * 24-hour online Internet account access and transactions

        You will find more  information  about  these  choices  in our  Investor
     Services Guide, which you may request by calling us, accessing our Web site
     or visiting one of our Investor Centers.

        Information  contained  in  our  Investor  Services  Guide  pertains  to
     shareholders  who invest directly with American Century rather than through
     an employer-sponsored retirement plan or through a financial intermediary.

        If  you  own  or are  considering  purchasing  fund  shares  through  an
     employer-sponsored retirement plan or financial intermediary,  your ability
     to purchase shares of the fund,  exchange them for shares of other American
     Century  funds and  redeem  them  will  depend on the terms of your plan or
     financial  intermediary.  If  you  have  questions  about  investing  in an
     employer-sponsored  retirement  plan or through a  financial  intermediary,
     call an Institutional Service Representative at 1-800-345-3533.


- --------------------------------------------------------------------------------
[american century logo (reg.sm)]
American
Century


AMERICAN CENTURY INVESTMENTS
P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR SERVICES
1-800-345-2021 or 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

CORPORATE; NOT-FOR-PROFIT;  FOUNDATIONS; ENDOWMENTS; KEOGH; SEP- , SARSEP- , AND
SIMPLE-IRA; AND 403(B) SERVICES 1-800-345-3533

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 or 816-444-3485

FAX  816-340-7962

SH-PRF-14825   9901
                                                        Funds Distributor, Inc.
<PAGE>
                                  FUND PROFILE

                                  Equity Growth

                                 INVESTOR CLASS

                                January 15, 1999

                        [american century logo (reg.sm)]
                                    American
                                    Century

- --------------------------------------------------------------------------------
This profile  summarizes key information  about the fund that is included in the
fund's Prospectus. The fund's Prospectus has additional information about the
   fund, including a more detailed description of  the risks associated with
investing in the fund, that you may want  to consider before you invest. You may
   obtain the Prospectus and other  information about the fund at no cost by
 calling us at 1-800-345-2021,  accessing our Web site or visiting one of our
Investor Centers.  See the back cover for additional telephone numbers and our
                                   address.

                             AMERICAN CENTURY GROUP


                          AMERICAN CENTURY INVESTMENTS

                                  EQUITY GROWTH

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

        Equity Growth seeks capital appreciation by investing in common stocks.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

        The  fund's  investment   strategy  utilizes   quantitative   management
     techniques in a two-step process that draws heavily on computer technology.
     In the first step,  the fund  managers  rank  stocks,  primarily  the 1,500
     largest  publicly  traded  companies in the United States  (measured by the
     value of their stock),  from most attractive to least  attractive.  This is
     determined by using a computer  model that  combines  measures of a stock's
     value, as well as measures of its growth  potential.  To measure value, the
     fund   managers  use  ratios  of  stock   price-to-book   value  and  stock
     price-to-cash flow, among others. To measure growth, the fund managers use,
     among others, the rate of growth of a company's earnings and changes in the
     earnings estimates for a company.

        In the second step, the fund managers use a technique  called  portfolio
     optimization.  In portfolio optimization,  the fund managers use a computer
     to build a portfolio  of stocks that they  believe will provide the optimal
     balance between risk and expected  return of the portfolio,  as measured in
     the stock ranking completed in the first step. The goal is to create a fund
     that provides better returns than the S&P 500 without taking on significant
     additional risk.

        The fund may invest in securities other than stocks, such as convertible
     securities,  foreign securities,  short-term  instruments and non-leveraged
     stock index futures contracts.  "Non-leveraged" means that the fund may not
     invest in futures  contracts  where it would be  possible to lose more than
     the fund invested.

        Additional information about Equity Growth's investments is available in
     its  annual  and  semiannual  reports.  In these  reports  you will  find a
     discussion  of  the  market  conditions  and  investment   strategies  that
     significantly affected the fund's performance during the most recent fiscal
     period. You may get these reports at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    *The value of Equity  Growth's shares depends on the value of the stocks and
     other  securities it owns. The value of the individual  securities that the
     fund owns will go up and down depending on the performance of the companies
     that issued  them,  general  market and economic  conditions,  and investor
     confidence.

    *Market  performance  tends  to be  cyclical,  and  in the  various  cycles,
     certain  investment  styles may fall in and out of favor.  If the market is
     not  favoring the fund's  style,  the fund's gains may not be as big as, or
     its  losses  may  be  bigger  than,  other  equity  funds  using  different
     investment styles.

    *As with all funds,  at any given  time,  the value of your shares of Equity
     Growth may be worth more or less than the price you paid.  If you sell your
     shares when the value is less than the price you paid, you will lose money.

    *An investment  in the fund is not a bank deposit,  and it is not insured or
     guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other
     government agency.

    *Although  the fund  managers  invest the fund's  assets  primarily  in U.S.
     stocks,  Equity  Growth can  invest in  securities  of  foreign  companies.
     Foreign securities can have certain unique risks, including fluctuations in
     currency  exchange  rates,  unstable  political  and  economic  structures,
     reduced  availability  of  public  information  and  the  lack  of  uniform
     financial reporting and regulatory practices similar to those that apply to
     U.S. issuers.

        In summary,  Equity  Growth is intended for  investors  who seek capital
     appreciation through an equity fund and who are willing to accept the risks
     associated with the fund's investment strategy.

     FUND PERFORMANCE

        The following bar chart shows the actual  performance of Equity Growth's
     Investor Class shares for each calendar year since the fund's  inception on
     May 9,  1991.  The  bar  chart  indicates  the  volatility  of  the  fund's
     historical  returns  from  year to  year.  Neither  the bar  chart  nor the
     performance  information below it is intended to indicate how the fund will
     perform in the future.


EQUITY GROWTH                                       AMERICAN CENTURY INVESTMENTS


[bar chart]
     -------------------------------------------------------------------------
     CALENDAR YEAR-BY-YEAR RETURNS
     -------------------------------------------------------------------------
     1998      25.45%
     1997      36.06%
     1996      27.34%
     1995      34.56%
     1994      -0.23%
     1993      11.42%
     1992       4.13%

        The highest and lowest returns of the fund's Investor Class shares for a
     calendar quarter during the period reflected by the preceding bar chart are
     provided  in  the  following  chart  to  indicate  the  fund's   historical
     short-term  volatility.  Shareholders should be aware, however, that Equity
     Growth is intended for investors with a long-term investment horizon and is
     not managed for short-term results.

[bar chart]
     -------------------------------------------------------------------------
     HIGHEST AND LOWEST QUARTERLY RETURNS
     -------------------------------------------------------------------------
     Quarter Ended 12/31/98            23.10%
     Quarter Ended  9/30/98           -13.88%

        The  following  table  shows the  average  annual  return of the  fund's
     Investor  Class  shares for the periods  indicated.  The S&P 500 Index,  an
     unmanaged  index  that  reflects  no  operating  costs,  is  included  as a
     benchmark for performance comparisons.

                                1 YEAR       5 YEARS      LIFE OF FUND
     -------------------------------------------------------------------------
     AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED DECEMBER 31, 1998)
     -------------------------------------------------------------------------
     Equity Growth              25.45%         23.88%         19.79%
     S&P 500 Index              28.68%         24.05%         19.39%

4. WHAT ARE THE FUND'S FEES AND EXPENSES?

        There  are no sales  loads,  fees or other  charges  to buy fund  shares
     directly from American Century, to reinvest dividends in additional shares,
     to exchange into the Investor Class shares of other American  Century funds
     or to redeem  your  shares.  The  following  table  describes  the fees and
     expenses that you will pay if you buy and hold shares of the fund.

     -------------------------------------------------------------------------
      ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
     -------------------------------------------------------------------------
     Management Fee                            0.70%(1)
     Distribution and Service (12b-1) Fees      None
     Other Expenses(2)                         0.01%
     Total Annual Fund Operating Expenses      0.71%

        (1)Based  upon assets at December 31,  1998.  The fund has a stepped fee
        schedule.  As a result, the fund's management fee generally decreases as
        fund assets increase.

        (2)Other   expenses   include  the  fees  and  expenses  of  the  fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses.

           EXAMPLE

              Assuming you . . .
              * invest $10,000 in the fund
              * redeem your shares at the end of the periods shown below 
              * earn a 5% return each year 
              * incur the same fund operating expenses shown above

               . . . your cost of investing in the fund would be:

                 1 year           3 years          5 years           10 years
                   $72             $227             $394               $880

               Of course,  actual costs may be higher or lower. Use this example
           to compare the costs of investing in other funds.


5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

        American  Century  Investment   Management,   Inc.  provides  investment
     advisory and management  services for the fund. American Century uses teams
     of portfolio  managers,  assistant  portfolio managers and analysts working
     together to manage its mutual funds.  The portfolio  managers on the Equity
     Growth team are as follows:


FUND PROFILE                                                      EQUITY GROWTH


        JOHN SCHNIEDWIND,  Senior Vice President and Group  Leader--Quantitative
     Equity,  has been a member of the team that manages Equity Growth since its
     inception.  He joined American  Century in 1982 and also  supervises  other
     portfolio  management  teams. He has degrees from Purdue  University and an
     MBA in  finance  from  the  University  of  California.  He is a  Chartered
     Financial Analyst.

        JEFFREY R. TYLER, Senior Vice President and Portfolio Manager,  has been
     a member of the team that manages  Equity Growth since June 1997. He joined
     American  Century as a portfolio  manager in 1988.  He has a bachelor's  in
     business  economics from the University of California and an MBA in finance
     and economics from  Northwestern  University.  He is a Chartered  Financial
     Analyst.

6. HOW DO I BUY FUND SHARES?

     * Complete and return the enclosed application

     * Call us and exchange shares from another American Century fund

     * Call us and send your investment by bank wire transfer

        Your initial  investment must be at least $2,500 ($1,000 for traditional
     IRAs, Roth IRAs and UGMA/UTMA accounts),  unless you establish an automatic
     investment  plan of at least $50 per  month.  If the value of your  account
     falls   below  this   account   minimum,   your   shares  may  be  redeemed
     involuntarily.

7. HOW DO I SELL FUND SHARES?

        You may sell all or part of your  fund  shares  on any  business  day by
     writing or calling us. You also may exchange  your shares in Equity  Growth
     for shares in nearly 70 other  mutual  funds  offered by American  Century.
     Depending  on the  options  you  select  when you open your  account,  some
     restrictions  may apply.  For your  protection,  some  redemption  requests
     require a signature guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

        Equity  Growth pays  distributions  of  substantially  all of its income
     quarterly. Distributions from realized capital gains are paid twice a year,
     usually in March and  December.  Distributions  may be taxable as  ordinary
     income,  capital gains or a combination of the two. Capital gains are taxed
     at  different  rates  depending  on the  length  of time the fund  held the
     securities that were sold.  Distributions  are reinvested  automatically in
     additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

        American Century offers several ways to make it easier for you to manage
     your account, such as:

     * telephone transactions

     * wire and electronic funds transfers

     * 24-hour Automated Information Line transactions

     * 24-hour online Internet account access and transactions

        You will find more  information  about  these  choices  in our  Investor
     Services Guide, which you may request by calling us, accessing our Web site
     or visiting one of our Investor Centers.

        Information  contained  in  our  Investor  Services  Guide  pertains  to
     shareholders  who invest directly with American Century rather than through
     an employer-sponsored retirement plan or through a financial intermediary

        If  you  own  or are  considering  purchasing  fund  shares  through  an
     employer-sponsored retirement plan or financial intermediary,  your ability
     to purchase shares of the fund,  exchange them for shares of other American
     Century  funds and  redeem  them  will  depend on the terms of your plan or
     financial  intermediary.  If  you  have  questions  about  investing  in an
     employer-sponsored  retirement  plan or through a  financial  intermediary,
     call an Institutional Service Representative at 1-800-345-3533.

- --------------------------------------------------------------------------------
[american century logo (reg.sm)]
American
Century

AMERICAN CENTURY INVESTMENTS
P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR SERVICES
1-800-345-2021 or 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

CORPORATE; NOT-FOR-PROFIT;  FOUNDATIONS; ENDOWMENTS; KEOGH; SEP- , SARSEP- , AND
SIMPLE-IRA; AND 403(B) SERVICES 1-800-345-3533

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 or 816-444-3485

FAX
816-340-7962

SH-PRF-14826   9901                                     Funds Distributor, Inc.
<PAGE>
                                  FUND PROFILE

                             Small Cap Quantitative

                                 INVESTOR CLASS

                                January 15, 1999

                        [american century logo (reg.sm)]
                                    American
                                    Century

- --------------------------------------------------------------------------------
This profile  summarizes key information  about the fund that is included in the
fund's Prospectus. The fund's Prospectus has additional information about the
   fund, including a more detailed description of  the risks associated with
investing in the fund, that you may want  to consider before you invest. You may
   obtain the Prospectus and other  information about the fund at no cost by
 calling us at 1-800-345-2021,  accessing our Web site or visiting one of our
Investor Centers.  See the back cover for additional telephone numbers and our
                                   address.

                             AMERICAN CENTURY GROUP


                          AMERICAN CENTURY INVESTMENTS

                             SMALL CAP QUANTITATIVE

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

        Small Cap Quantitative seeks capital appreciation by investing primarily
     in common stocks of small companies.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

        The  fund's  investment   strategy  utilizes   quantitative   management
     techniques in a two-step process that draws heavily on computer technology.
     In the  first  step,  the fund  managers  rank  stocks,  primarily  smaller
     companies  (measured by the value of their stock),  from most attractive to
     least  attractive.  This is  determined  by  using a  computer  model  that
     combines  measures  of a stock's  value,  as well as measures of its growth
     potential.  To  measure  value,  the  fund  managers  use  ratios  of stock
     price-to-book  value and stock price-to-cash flow, among others. To measure
     growth,  the fund  managers  use,  among  others,  the rate of  growth of a
     company's earnings and changes in the earnings estimates for a company.

        In the second step, the fund managers use a technique  called  portfolio
     optimization.  In portfolio optimization,  the fund managers use a computer
     to build a portfolio  of stocks that they  believe will provide the optimal
     balance between risk and expected  return of the portfolio,  as measured in
     the stock ranking completed in the first step. The goal is to create a fund
     that provides  better  returns than the S&P Small-Cap 600 Index but without
     taking on significant additional risk.

        The fund invests  primarily in common stocks of companies  which, at the
     time of investment, have market capitalization not greater than that of the
     largest company in the S&P Small-Cap 600 Index. The S&P Small-Cap 600 Index
     is  an  unmanaged  stock  index  that  tracks  the  performance  of  equity
     securities  of smaller  companies.  As of December  31,  1998,  the largest
     company  in the index had a market  capitalization  of  approximately  $3.3
     billion,  while the median company in the index had a market capitalization
     of approximately $463 million.

        The fund may invest in securities other than stocks, such as convertible
     securities,  foreign securities,  short-term  instruments and non-leveraged
     stock index futures contracts.  "Non-leveraged" means that the fund may not
     invest in futures  contracts  where it would be  possible to lose more than
     the fund invested.

        Additional  information  about Small Cap  Quantitative's  investments is
     available  in its  semiannual  report.  In  this  report  you  will  find a
     discussion  of  the  market  conditions  and  investment   strategies  that
     significantly affected the fund's performance during the most recent fiscal
     period. You may get this report at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    *The value of the Small Cap  Quantitative's  shares  depends on the value of
     the  stocks  and other  securities  it owns.  The  value of the  individual
     securities the fund owns will go up and down  depending on the  performance
     of the companies that issued them, general market and economic  conditions,
     and investor confidence.

    *Market  performance  tends  to be  cyclical,  and  in the  various  cycles,
     certain  investment  styles may fall in and out of favor.  If the market is
     not  favoring the fund's  style,  the fund's gains may not be as big as, or
     its  losses  may  be  bigger  than,  other  equity  funds  using  different
     investment styles.

    *As with all funds,  at any given  time,  the value of your  shares of Small
     Cap  Quantitative may be worth more or less than the price you paid. If you
     sell your shares  when the value is less than the price you paid,  you will
     lose money.

    *An investment  in the fund is not a bank deposit,  and it is not insured or
     guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other
     government agency.

    *Although  the fund  managers  invest the fund's  assets  primarily  in U.S.
     stocks,  Small  Cap  Quantitative  can  invest  in  securities  of  foreign
     companies.  Foreign  securities  can have certain  unique risks,  including
     fluctuations in currency  exchange rates,  unstable  political and economic
     structures,  reduced  availability  of public  information  and the lack of
     uniform financial reporting and regulatory  practices similar to those that
     apply to U.S. issuers.

        In summary,  Small Cap  Quantitative  is intended for investors who seek
     capital appreciation through a small capitalization equity fund and who are
     willing to accept the risks associated with the fund's investment strategy.


SMALL CAP QUANTITATIVE                             AMERICAN CENTURY INVESTMENTS


4. WHAT ARE THE FUND'S FEES AND EXPENSES?

        There  are no sales  loads,  fees or other  charges  to buy fund  shares
     directly from American Century, to reinvest dividends in additional shares,
     to exchange  into the  Investor  Class  shares of shares of other  American
     Century funds, or to redeem your shares.  The following table describes the
     fees and expenses that you will pay if you buy and hold shares of the fund

     -------------------------------------------------------------------------
     ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
     -------------------------------------------------------------------------
     Management Fee                            0.90%(1)
     Distribution and Service (12b-1) Fees     None
     Other Expenses(2)                         0.01%
     Total Annual Fund Operating Expenses      0.91%

        (1)Based on assets as of December 31,  1998.  The fund has a stepped fee
        schedule.  As a result, the fund's management fee generally decreases as
        fund assets increase.

        (2)Other   expenses   include  the  fees  and  expenses  of  the  fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses.

           EXAMPLE

               Assuming you...
              * invest $10,000 in the fund
              * redeem your shares at the end of the periods shown below 
              * earn a 5% return each year 
              * incur the same fund operating expenses shown above

                ...your cost of investing in the fund would be:

                 1 year           3 years          5 years           10 years
                  $93              $289             $502              $1,115

               Of course,  actual costs may be higher or lower. Use this example
               to compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

        American  Century  Investment   Management,   Inc.  provides  investment
     advisory and management  services for the fund. American Century uses teams
     of portfolio  managers,  assistant  portfolio managers and analysts working
     together to manage its mutual funds.  The  portfolio  managers on the Small
     Cap Quantitative team are as follows:

        JOHN SCHNIEDWIND,  Senior Vice President and Group  Leader--Quantitative
     Equity,  supervises the team that manages the fund. He has been a member of
     the team that  manages the fund since its  inception  in July 1998.  He has
     degrees from Purdue University and an MBA in finance from the University of
     California. He is a Chartered Financial Analyst.

        KURT  BORGWARDT,  Vice  President,  Portfolio  Manager  and  Director of
     Quantitative  Equity  Research,  joined  American  Century in 1990, and has
     managed the  quantitative  equity research effort since then. He has been a
     member of the team that manages the fund since its  inception in July 1998.
     He has a degree from Stanford  University and an MBA with a  specialization
     in finance  from the  University  of Chicago.  He is a Chartered  Financial
     Analyst.

        WILLIAM MARTIN, Vice President and Portfolio Manager,  has been a member
     of the team that  manages  the fund since its  inception  in July 1998.  He
     joined American  Century in 1989. He has a bachelor's in economics from the
     University of Illinois. He is a Chartered Financial Analyst.

6. HOW DO I BUY FUND SHARES?

     * Complete and return the enclosed application

     * Call us and exchange shares from another American Century fund

     * Call us and send your investment by bank wire transfer

        Your initial  investment must be at least $2,500 ($1,000 for traditional
     IRAs, Roth IRAs and UGMA/UTMA accounts),  unless you establish an automatic
     investment  plan of at least $50 per  month.  If the value of your  account
     falls   below  this   account   minimum,   your   shares  may  be  redeemed
     involuntarily.

7. HOW DO I SELL FUND SHARES?

        You may sell all or part of your  fund  shares  on any  business  day by
     writing  or  calling  us. You also may  exchange  your  shares in Small Cap
     Quantitative for shares in nearly 70 other mutual funds offered by American
     Century.  Depending  on the options you select when you open your  account,
     some restrictions may apply. For your protection,  some redemption requests
     require a signature guarantee.


FUND PROFILE                                             SMALL CAP QUANTITATIVE


8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

        Small Cap Quantitative  pays  distributions of substantially  all of its
     income quarterly.  Distributions from realized capital gains are paid twice
     a year,  usually  in March and  December.  Distributions  may be taxable as
     ordinary  income,  capital gains or a combination of the two. Capital gains
     are taxed at different  rates depending on the length of time the fund held
     the securities that were sold.  Distributions are reinvested  automatically
     in additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

        American Century offers several ways to make it easier for you to manage
     your account, such as:

     * telephone transactions

     * wire and electronic funds transfers

     * 24-hour Automated Information Line transactions

     * 24-hour online Internet account access and transactions

        You will find more  information  about  these  choices  in our  Investor
     Services Guide, which you may request by calling us, accessing our Web site
     or visiting one of our Investor Centers.

        Information  contained  in  our  Investor  Services  Guide  pertains  to
     shareholders  who invest directly with American Century rather than through
     an employer-sponsored retirement plan or through a financial intermediary.

        If  you  own  or are  considering  purchasing  fund  shares  through  an
     employer-sponsored retirement plan or financial intermediary,  your ability
     to purchase shares of the fund,  exchange them for shares of other American
     Century  funds,  and redeem  them will  depend on the terms of your plan or
     financial  intermediary.  If  you  have  questions  about  investing  in an
     employer-sponsored  retirement  plan or through a  financial  intermediary,
     call an Institutional Service Representative at 1-800-345-3533.

- --------------------------------------------------------------------------------
[american century logo (reg.sm)]
American
Century

AMERICAN CENTURY INVESTMENTS
P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR SERVICES
1-800-345-2021 or 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

CORPORATE; NOT-FOR-PROFIT;  FOUNDATIONS; ENDOWMENTS; KEOGH; SEP- , SARSEP- , AND
SIMPLE-IRA; AND 403(B) SERVICES 1-800-345-3533

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 or 816-444-3485

FAX
816-340-7962

SH-PRF-14827   9901                                     Funds Distributor, Inc.


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