AMERICAN CENTURY WORLD MUTUAL FUNDS INC
N-30D, 1997-07-28
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                               SEMIANNUAL REPORT

                            [american century logo]
                                    American
                                  Century(sm)

                                  MAY 31, 1997

                                   TWENTIETH
                                    CENTURY
                                     GROUP


                              International Growth
                            International Discovery


[front cover]


TABLE OF CONTENTS

Report Highlights ................................... 1
Our Message to You .................................. 2
International Growth
   Performance & Portfolio Information .............. 3
   Management Q & A ................................. 4
   Schedule of Investments .......................... 7
   Financial Highlights .............................29
International Discovery
   Performance & Portfolio Information ..............11
   Management Q & A .................................12
   Schedule of Investments ..........................15
   Financial Highlights .............................31
Statements of Assets and Liabilities ................22
Statements of Operations ............................23
Statements of Changes in Net Assets .................24
Notes to Financial Statements .......................25
Share Classes and Retirement
   Account Information ..............................35
Background Information
   Investment Philosophy and Policies ...............36
   How Currency Returns Affect Performance ..........36
   Comparative Indices ..............................36
   Fund Management Team Leaders .....................36
Glossary ............................................37

     American  Century  Investments  offers you nearly 70 fund choices  covering
bonds, stocks,  specialty  investments and blended portfolios.  To help you find
the funds that may meet your needs, we have divided  American Century funds into
three groups based on  investment  style and  objectives.  These  groups,  which
appear below, are designed to help simplify your fund decisions.

                 AMERICAN CENTURY INVESTMENTS - FAMILY OF FUNDS


  BENHAM GROUP             AMERICAN CENTURY GROUP       TWENTIETH CENTURY GROUP
                                                                               
MONEY MARKET FUNDS         ASSET ALLOCATION &                                  
GOVERNMENT BOND FUNDS      BALANCED FUNDS                  U.S. GROWTH FUNDS
DIVERSIFIED BOND FUNDS     CONSERVATIVE EQUITY FUNDS      INTERNATIONAL FUNDS
MUNICIPAL BOND FUNDS       SPECIALTY FUNDS                                     
                                                                               
                                                        International Growth   
                                                        International Discovery


We welcome your comments or questions about this report.  
See the back cover for ways to contact us by mail, phone or e-mail.

Twentieth  Century and the Benham Group are registered marks of American Century
Services Corporation and Benham Management Corporation,  respectively.  American
Century is a service mark of American Century Services Corporation.

                                                    American Century Investments


                               REPORT HIGHLIGHTS

PERIOD OVERVIEW

o  As  a  group,   international   equity   markets   posted   modest   returns,
underperforming the U.S. stock market for the six-month period. The total return
for the Morgan Stanley  Europe,  Australia,  Far East Index (EAFE(R)) was 4.04%,
compared to 13.17% for the S&P 500.

o Strong  performance by European and Latin American  markets was offset by flat
returns in Japan and sharp declines in Far Eastern  markets such as Thailand and
the Philippines. European equities benefited from falling interest rates and low
inflation,    while   Latin    American    shares    rebounded   from   previous
under-performance,  and were bolstered by strong growth  prospects and improving
economic conditions.

o Japanese market  performance was hampered by the country's  sluggish  economy.
Declining  Japanese  foreign  investment,  combined with a weaker  Japanese yen,
adversely affected other Far Eastern markets.

INTERNATIONAL GROWTH

o The  investment  team's  methodology  worked well.  The fund  provided  strong
performance  for the  period,  returning  16.58%.  The team sought out and found
strong growth stocks that generated excellent returns.

o Execution of the fund's  "bottom up" approach led to investments in the shares
of relatively more European companies and fewer firms in Japan and the Far East.

o Holdings in financial  services,  technology,  automotive and  pharmaceuticals
performed well.

o The  investment  team is confident  that the rewards of  international  equity
investing  can continue due to several  compelling  factors.  These  include the
opening  of new  investment  markets in Eastern  Europe and  Africa,  as well as
Europe's and Japan's belated efforts to address pension  deficits,  which should
create additional investment demand.

INTERNATIONAL DISCOVERY

o The fund  performed  well,  with a total  return  for the  period  of  15.14%.
International  Discovery has  outperformed  EAFE(R) over the  three-year  period
since the fund's inception.

o The fund's  largest  regional  weighting  was in Europe  because of the strong
earnings  growth   available   there.   Conversely,   the  fund  was  relatively
underweighted  in Japan and the Far East  because  growth was more  difficult to
find.

o The investment team is watching Europe  carefully.  Uncertainty  over European
Monetary Union could affect the fund's holdings in the short-term.

o In the  longer-term  the team is confident that its  diversified  portfolio of
fast-growing  successful  companies has strong  potential to continue to perform
well, regardless of political uncertainties.



                              INTERNATIONAL GROWTH
                               INVESTOR CLASS(1)

                          TOTAL RETURNS: AS OF 5/31/97
                               6 Months 16.58%(2)
                                1 Year 23.36%(2)

                            NET ASSETS: $1.7 billion
                                 (AS OF 5/31/97)

                             INCEPTION DATE: 5/9/91

                              TICKER SYMBOL: TWIEX



                            INTERNATIONAL DISCOVERY
                               INVESTOR CLASS(1)

                          TOTAL RETURNS: AS OF 5/31/97
                               6 Months 15.14%(2)
                                1 Year 23.42%(2)

                           NET ASSETS: $583.5 million
                                 (AS of 5/31/97)

                             INCEPTION DATE: 4/1/94

                              TICKER SYMBOL: TWEGX


                        (1) See Share Classes, page 35.
                              (2) Not annualized.


Semiannual Report                                            Report Highlights 1


                               OUR MESSAGE TO YOU

[photo of James E. Stowers, Jr. and James E. Stowers III]

     The six-month  period ended May 31, 1997,  was very rewarding for investors
in American Century's  international equity funds. The investment team's "bottom
up" approach, which focuses on choosing successful individual companies,  worked
well. Both funds  significantly  outperformed  their benchmark index, the Morgan
Stanley Europe,  Australia,  Far East Index (EAFE(R)),  as well as most of their
peer group.

     Based on their 1997 year-to-date  returns as of May 31,  Morningstar ranked
International  Growth  in the top 2% of 398  funds in its  foreign  stock  funds
category and  International  Discovery in the top 3%.  Furthermore,  Morningstar
gave  International  Growth a four-star rating and International  Discovery five
stars for their  three-year  performance  out of 508 foreign stock funds.  These
Morningstar  proprietary ratings reflect historical,  risk-adjusted  performance
for  investment  periods  ended  May 31,  1997.  The top 10% of the  funds in an
investment category receive five stars and the next 22.5% receive four stars.*

     American  Century's  international  investment  team is well  positioned to
continue seeking equity  opportunities  abroad.  Portfolio manager Mark Kopinski
returned in April after working with another investment company. He replaced Ted
Tyson,  who left to pursue other  interests.  Kopinski joins  portfolio  manager
Henrik Strabo and five analysts-a team that Kopinski helped select-to  co-manage
both funds and help develop new international funds.

     We also  strengthened  our corporate  team. In June,  Bill Lyons,  American
Century's   Chief   Operating   Officer,   became   President,   assuming   full
responsibility for the company's day-to-day operations. With this change we will
be  able  to  spend  more  time  on  developing   and  refining  new  investment
technologies  and tools that build on and  leverage  the  proprietary  system we
pioneered 25 years ago. One of our goals is to ensure that we continue to evolve
and  innovate-building  the  investment  tools  today  that will lead us and our
investors to success in the next century.

     We  appreciate  your  confidence  in American  Century and look  forward to
continuing to serve you.


Sincerely,

/s/James E. Stowers, Jr.                          /s/James E. Stowers III
James E. Stowers, Jr.                             James E. Stowers III   
Chairman of the Board and Founder                 Chief Executive Officer

                                                  
* International Growth has a four-star rating for its five-year  performance out
of 227 funds.  The ratings,  which may change  monthly,  are calculated from the
funds'  average  annual total returns in excess of 90-day  Treasury bill returns
with  appropriate  fee  adjustments,  and  a  risk  factor  that  reflects  fund
performance below 90-day Treasury bill returns.


2    Our Message to You                             American Century Investments

<TABLE>
<CAPTION>
                              INTERNATIONAL GROWTH

TOTAL RETURNS AS OF MAY 31, 1997

                                                            AVERAGE ANNUAL RETURNS
                            6 MONTHS      1 YEAR      3 YEARS     5 YEARS     LIFE OF FUND

INVESTOR CLASS
(inception 5/9/91)
<S>                         <C>           <C>         <C>         <C>         <C>   
   International Growth ... 16.58%        23.36%      11.96%      12.77%      14.71%
   MSCI EAFE(R)Index ......  4.04%         7.54%       7.69%       10.55%      8.09%(1)
   S&P 500 ................ 13.17%        29.48%      25.99%      18.38%      17.09%

ADVISOR CLASS
(inception 10/2/96)
   International Growth ... 16.56% .......................................... 20.86%
   MSCI EAFE(R)Index ......  4.04% ..........................................  7.07%
   S&P 500 ................ 13.17% .......................................... 23.44%
</TABLE>

(1) For the period from 5/31/91 (date closest to fund's inception for which data
are available) to 5/31/97.


See pages  35-37 for more  information  about  share  classes,  the  comparative
indices and returns.


[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND (Investor Class)

                        INTERNATIONAL
                           GROWTH       MSCI EAFE INDEX      S&P 500
     DATE                ACCT VALUE        ACCT VALUE       ACCT VALUE

     May 31, 91            10000            10000             10000
     Jun 30, 91            9596             9265              9604
     Sep 30, 91            10231            10060             10117
     Dec 31, 91            10802            10228             10959
     Mar 31, 92            11418            9014              10683
     Jun 30, 92            12112            9205              10887
     Sep 30, 92            11611            9344              10908
     Dec 31, 92            11325            8983              11793
     Mar 31, 93            12301            10060             12306
     Jun 30, 93            12818            11072             12365
     Sep 30, 93            13654            11806             12683
     Dec 31, 93            16155            11908             12976
     Mar 31, 94            15568            12324             12488
     Jun 30, 94            15778            12954             12542
     Sep 30, 94            16344            12967             13155
     Dec 31, 94            15387            12834             13152
     Mar 31, 95            14879            13073             14429
     Jun 30, 95            15741            13168             15802
     Sep 30, 95            16581            13717             17054
     Dec 31, 95            17216            14273             18077
     Mar 31, 96            17614            14685             19047
     Jun 30, 96            18455            14917             19898
     Sep 30, 96            18500            14899             20509
     Dec 31, 96            19700            15136             22222
     Mar 31, 97            20789            14899             22821
     May 31, 97            22522            15952             25563

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original  cost.  Data quoted is for Investor Class only;  performance  for other
classes will vary due to differences in fee structures  (see Total Returns table
above).

The line  representing  International  Growth's total return includes  operating
expenses (such as transaction  costs and management  fees) that reduce  returns,
while the total return lines of the S&P 500 and the MSCI EAFE(R) indices do not.



PORTFOLIO AT A GLANCE
                           5/31/97          11/30/96
Number of Companies          99               101

Portfolio Turnover         71%(1)           158%(2)

Expense Ratio
(for Investor Class)       1.41%(3)          1.65%

(1) Six months ended 5/31/97.
(2) Year ended 11/30/96.
(3) Annualized.


Semiannual Report                                    International Growth      3


INTERNATIONAL GROWTH

MANAGEMENT Q & A

     An interview  with Henrik Strabo and Mark Kopinski,  portfolio  managers on
the International Growth investment team.

How did International Growth perform for the six months ended May 31, 1997?

     The fund provided strong  performance for its investors,  returning  16.58%
compared with a 4.04% return for EAFE(R), its benchmark index. For the 12 months
ended May 31, 1997, the fund is up 23.36% compared with EAFE(R)'s 7.54% return.

What explains the fund's strong performance?

     Our  methodology  worked well. We sought out and found strong growth stocks
that generated  excellent returns.  Execution of our "bottom up" approach led to
investments in the shares of relatively more European  companies and fewer firms
in Japan and the Far East.  European stocks performed well during the period for
several  reasons.  Europe is in a different stage of the business cycle than the
United States,  characterized  by falling  interest rates and investor  optimism
about continued low rates.  This environment  benefits stocks as companies enjoy
lower borrowing costs. European shares also surged as many corporations followed
the U.S.'s lead in restructuring to become more competitive  globally.  Finally,
the growing number of participants in European markets has increased pressure on
European companies to improve stock performance.  

     Our holdings in Japan, and the Far East were limited by our earnings growth
methodology.  Japan's economy has grown at an anemic rate since the early 1990s,
although it has rebounded a little in recent months.  We primarily found growing
companies in the technology  sector,  which is benefiting from growth outside of
Japan. In the Far East, the once-booming  economies of Thailand, the Philippines
and  Singapore  have tumbled as the value of the Japanese  yen  declined,  which
reduced their relative competitiveness.


[bar graph - data below]

INTERNATIONAL GROWTH'S ONE-YEAR RETURNS(1)
(Periods ended May 31)

                          5/92        5/93     5/94      5/95    5/96     5/97

Internnational Growth     23.43%(2)    5.79%   22.93%   -2.89%   17.13%   23.36%
EAFE(R)                   -3.37%(2)   16.40%   13.57%    4.93%   10.67%    7.54%


This chart  illustrates  the fund's returns over the past six years and compares
them with  EAFE(R)'s  returns.  International  Growth's  total  returns  include
operating  expenses,  while  the  index's  returns  do  not.  See  page 36 for a
description of EAFE(R). Past performance is no guarantee
of future results.

(1) Investor Class.

(2) Returns from 5/31/91(the date closest to fund's inception for which data was
available) to 5/31/92.

4    International Growth                           American Century Investments


INTERNATIONAL GROWTH

What changes did you make to the portfolio during the period?

     We sharply increased holdings in the Netherlands.  At the end of the period
these holdings stood at 14%,  second only to Japan.  The  Netherlands has a long
history as the  center of trade for  Europe and is home to some of the  largest,
most profitable  businesses in the world.  One of the stocks we added during the
period  illustrates one way in which the Dutch continue to dominate world trade.
Internationale  Nederland  Groep (ING) is a financial  services  company that is
participating in a global boom in its industry.  ING has entered southeast Asia,
Eastern Europe and Latin America to serve the  increasing  demand for insurance,
banking, brokerage services and mutual funds.

     Another Dutch company we own is Randstad Holdings,  which provides employee
outsourcing and placement services.  European labor law has historically favored
unionized  labor and offered  employers  little  flexibility  in managing  their
workforces.  With the trend toward corporate restructuring,  that is starting to
change. Randstad has gained significant market share in Belgium, the Netherlands
and  Luxembourg by providing  temporary  workers at a time when demand for these
workers is skyrocketing.

Which stocks or sectors added most to the fund's returns?

     Holdings in financial services,  technology,  automotive and pharmaceutical
sectors all performed well during the period.  Three holdings,  discussed in our
last shareholder report,  Telebras,  Volkswagen and HSBC Holdings,  continued to
lead  the  list  of  top  performing  stocks.   Rohm  Co.  Ltd.  was  among  our
top-performing Japanese stocks. The company supplies electronic parts to digital
cellular  phone  manufacturers  and  makes  specialized  semiconductors  used in
computers.  Its stock performed well because of the increasing global demand for
digital cellular phone service.  Demand for these phones has been so strong that
we added two phone  manufacturers  to the  portfolio  during the period:  Nokia,
which is based in Finland, and Ericsson, which is a Swedish company.

During the period,  the fund  continued  to have the largest  percentage  of its
investments in Japan - 22% as of May 31. How did these holdings perform?

     The fund has  enjoyed  solid  performance  from its  Japanese  holdings  by
focusing on the stocks of electronics  companies  with high export rates.  These
companies are benefiting from three trends: the Japanese yen's weakness relative
to the  U.S.  dollar,  which  makes  Japanese  goods  less  expensive  and  more
competitive  in the U.S.;  strong  markets  for their  products  worldwide;  and
corporate restructuring that has increased profitability.


TOP TEN HOLDINGS                     % of fund investments

                                    As of            As of
                                    5/31/97          11/30/96
Novartis AG(1)                      3.8%             4.7%
ING Groep N.V.                      2.8%             -
Credit Suisse Group                 2.4%             -
Phillips Electronics N.V.           2.4%             -
Daimler-Benz AG                     2.3%             2.3%
HSBC Holdings plc                   2.2%             2.5%
British Aerospace plc               2.1%             -
Nippon Telegraph & Telephone        2.1%             -
Volkswagen AG                       2.0%             2.5%
Sankyo Co. Ltd.                     1.9%             3.1%

(1) Spinoff from Sandoz on 12/23/96.

See the Schedule of Investments for company nationalities and descriptions.


TOP FIVE INDUSTRIES                 % of fund investments

                                    As of            As of
                                    5/31/97          11/30/96
Electrical &
  Electronic Components             11.3%            4%
Communications Services             7.6%             8%
Pharmaceuticals                     7.2%             5%
Banking                             6.9%             7%
Automobiles & Auto Parts            6.8%             9%

Semiannual Report                                    International Growth      5



Recent  parliamentary  elections  in France have cast doubt on whether  European
countries  will  unite  under a single  currency.  How will  the  future  of the
European Monetary Union (EMU) affect the fund?

     The outgoing,  conservative French government,  like Germany, supported the
need for reduced  government  spending to qualify for EMU.  The  incoming,  more
liberal French government is less likely to maintain controls on spending.  This
shift raises  questions  about whether the monetary union will occur and, if so,
under what  conditions.  In the short term, the fund could be affected by rising
interest rates and falling stock prices  brought on by uncertainty  over EMU. In
the long term,  we are confident  that the European  companies in which the fund
invests will continue the strong  earnings  growth pattern we identified  before
buying  their  stock.  Their  growth is driven by factors  outside the  currency
debate.  If  European  companies  are to succeed,  they must become  competitive
globally.  That means they should  restructure to be more  efficient.  They also
must have access to capital  markets,  which  means  becoming  more  profitable,
thereby attracting more investors. These trends will continue, regardless of the
outcome of the economic monetary union debate.

Mark, can you tell us about your involvement with the fund?

     I helped  launch  International  Growth  in 1991 and  rejoined  the  fund's
management  in April after  working at another  investment  company.  I strongly
advocate a team  management  approach  and I am happy to see the  disciplines  I
helped put in place  continue.  Our team members  literally  travel the globe to
visit our existing  investments and seek out new ones, always with an eye toward
ensuring  we have some of the best growth  companies  in the world in the fund's
portfolio.

What do you see as the outlook for international investing?

     People say the world is getting  smaller  but, for us, the world is getting
bigger as equity markets  develop in countries that were formerly under the rule
of communism or a dictatorship.  Other parts of the international  community are
using the U.S. as a model for dealing with  financial  issues.  As a result,  we
have  never had a world  that  looks as  promising  as it does today in terms of
investment  opportunities.  A second  trend that should  improve the outlook for
international  investors  is the belated  effort by Western  Europe and Japan to
meet pension  deficits.  Demographics are forcing these mature economies to move
to more flexible types of retirement  plans that are funded jointly by employers
and  employees.  This will  result  in a massive  build-up  of  capital  seeking
investment  opportunities.  By  investing  in the  stocks  of the  companies  we
consider   to  have  the   strongest   growth   internationally,   the  fund  is
well-positioned to benefit from this trend.

[bar chart - data below]

INTERNATIONAL GROWTH'S INVESTMENTS BY COUNTRY

                  5/31/97           11/30/97
Japan             22%               20%
Netherlands       14%               4%
U.K.              11%               13%
Germany           11%               9%
Switzerland       10%               9%
Canada            7%                13%
France            5%                5%
Hong Kong         4%                4%
Other             17%               23%

*No other country represented more than 4% of the fund as of 5/31/97.



6    International Growth                           American Century Investments


                            SCHEDULE OF INVESTMENTS
                              INTERNATIONAL GROWTH


MAY 31, 1997 (UNAUDITED)

Shares                                               Value
- ------------------------------------------------------------------

COMMON STOCKS
ARGENTINA-0.7%
     206,000      Telecom Argentina Stet -
                  France Telecom S.A. ADR            $10,995,250
                                                     -----------
                  (communications services)

AUSTRALIA-1.6%
     2,374,600    Santos Ltd.                        9,720,124
                  (energy production
                  and marketing)
     1,945,000    Woodside Petroleum Limited         16,404,173
                                                     -----------
                  (energy production
                  and marketing)
                                                     26,124,297
                                                     -----------

AUSTRIA-1.1%
     103,000      VA Technologie AG                  18,203,391
                                                     -----------
                  (business services and supplies)

BERMUDA(1)
     27,500       Central European Media
                   Enterprises Ltd. Cl A(2)          639,375
                                                     -----------
                  (broadcasting and media)

CANADA-7.1%
     409,500      Bank of Nova Scotia                17,023,472
                  (banking)
     1,089,000    Bombardier Inc.                    22,932,142
                  (aerospace and defense)
     675,000      Moore Corporation Ltd.             15,096,395
                  (printing and publishing)
     110,000      Northern Telecom Ltd.(2)           9,229,568
                  (communications equipment)
     876,000      QLT PhotoTherapeutics, Inc.(2)     19,718,985
                  (biotechnology)
     493,400      Rigel Energy Corp.(2)              6,162,350
                   (energy production
                  and marketing)
     268,133      St. Laurent Paperboard Inc.
                   (Acquired 5/16/97
                  through 5/28/97,
                   Cost $4,068,934)(2)(3)            4,322,371
                  (paper and forest products)

Shares                                               Value
- ------------------------------------------------------------------
700,000           Talisman Energy, Inc.(2)           $22,949,570
                                                     -----------
                  (energy production
                  and marketing)
                                                     117,434,853
                                                     -----------

COLOMBIA-0.1%
     340,000      Banco de Bogota                    2,112,193
                                                     -----------
                  (banking)

FINLAND-2.0%
     246,000      Nokia Corp. Cl A ADR               16,236,000
                  (communications equipment)
     65,000       Raision Tehtaat Oy                 5,303,288
                  (food and beverage)
     135,000      Sampo Insurance Company Ltd.       11,801,272
                                                     -----------
                  (insurance)
                                                     33,340,560
                                                     -----------

FRANCE-4.5%
     275,000      AXA-UAP  16,493,221
                   (insurance)
     146,000      Alcatel Alsthom Compagnie
                  Generale(2)                        15,840,089
                  (communications services)
     109,000      Compagnie Generale
                  des Eaux(2)                        13,434,131
                  (utilities)
     9,000        Pinault-Printemps-Redoute SA       3,780,791
                  (retail - general merchandise)
     266,000      Schneider SA(2)                    12,804,312
                  (electrical
                  and electronic components)
     109,000      Societe Generale                   12,128,561
                                                     -----------
                  (banking)
                                                     74,481,105
                                                     -----------

GERMANY-9.5%
     451,300      BHW Holding AG(2)                  7,890,804
                  (financial services)
     27,000       Bayerische Motoren Werke
                  (BMW) AG                           22,147,757
                  (automobiles and auto parts)
     489,000      Daimler-Benz AG                    37,703,606
                  (automobiles and auto parts)

See Notes to Financial Statements

Semiannual Report                                    Schedule of Investments   7


                            SCHEDULE OF INVESTMENTS
                              INTERNATIONAL GROWTH



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
     143,000      Deutsche Bank AG                   $7,940,252
                  (financial services)
     291,600      Deutsche Pfandbrief-und
                  Hypothekenbank AG                  17,183,113
                  (banking)
     31,300       Henkel KGaA                        1,640,704
                  (chemicals and resins)
     20,000       Mannesmann AG                      8,138,376
                  (industrial machinery
                  and equipment)
     100,000      SGL CARBON Aktiengesellschaft      14,482,556
                  (electrical
                  and electronic components)
     142,000      Siemens AG                         8,020,440
                  (electrical
                  and electronic components)
     50,000       Volkswagen AG                      32,365,875
                                                     -----------

                  (automobiles and auto parts)
                                                     157,513,483
                                                     -----------


HONG KONG-3.5%
     1,220,615    HSBC Holdings plc                  37,019,362
                  (banking)
     6,000,000    Hong Kong
                  Telecommunications Ltd.            13,279,990
                  (communications services)
     2,269,000    New World
                  Infrastructure Ltd.(2)             7,071,865
                                                     -----------

                  (building
                  and home improvements)
                                                     57,371,217
                                                     -----------


ITALY-0.5%
     5,558,000    Credito Italiano                   8,287,791
                                                     -----------
                  (banking)

JAPAN-21.6%
     192,300      Advantest Corp.                    13,107,414
                  (electrical and
                  electronic components)
     709,000      Bridgestone Corp.                  16,047,765
                  (automobiles and auto parts)
     787,000      Canon, Inc.                        19,980,636
                  (consumer products)
     357,600      Circle K Japan Co., Ltd.           19,111,803
                  (retail - food and drug)
     125,000      Fuji Machine Manufacturing Co.     4,260,080
                  (industrial equipment
                  and machinery)

     Shares                                          Value
- -------------------------------------------------------------------

     455,000      Hoya Corp.                         $20,714,747
                  (electrical
                  and electronic components)
     115,000      JUSCO Co.                          3,889,582
                  (retail - food and drug)
     87,000       Keyence Corporation                12,578,855
                  (control and measurement)
     252,000      Konami Co., Ltd.                   9,000,387
                  (computer software and services)
     579,000      Mitsubishi Estate Co., Ltd.        7,922,974
                  (real estate)
     323,000      Nintendo Co., Ltd.                 25,296,269
                  (electrical
                  and electronic components)
     44,000       Nippon Broadcasting System         4,051,810
                  (broadcasting and media)
     3,700        Nippon Telegraph & Telephone       35,345,755
                  (communications services)
     270,000      Rohm Co. Ltd.                      28,116,528
                  (electrical
                  and electronic components)
     926,000      Sanden Corp.                       7,642,618
                  (automobiles and auto parts)
     977,000      Sankyo Co., Ltd.                   31,026,550
                  (pharmaceuticals)
     300,000      Sony Corp.                         25,328,112
                   (electrical
                  and electronic components)
     991,000      Sumitomo Realty & Development      7,803,821
                  (real estate)
     6,800        Takefuji Corporation               317,776
                   (financial services)
     1,152,000    Terumo Corporation                 20,324,455
                   (medical equipment
                  and supplies)
     137,000      Toyota Motor Corp.                 3,938,035
                  (automobiles and auto parts)
     635,000      Uni-Charm Corporation              21,422,609
                   (paper and forest products)
     1,139,000    Yamaha Corp.                       21,663,497
                                                     -----------
                   (leisure)
                                                     358,892,078
                                                     -----------

MEXICO-0.5%
     291,000      Grupo Televisa S.A. GDR(2)         8,329,875
                                                     -----------
                  (broadcasting and media)

See Notes to Financial Statements

8    Schedule of Investments                        American Century Investments


                            SCHEDULE OF INVESTMENTS
                              INTERNATIONAL GROWTH


MAY 31, 1997 (UNAUDITED)

Shares                                               Value
- ------------------------------------------------------------------
NETHERLANDS-14.4%
     109,000      Akzo Nobel                         $14,526,895
                  (chemicals and resins)
     246,153      Assurantieconcern
                  Stad Rotterdam                     11,033,648
                  (insurance)
     510,000      Getronics NV                       17,411,133
                  (computer software
                  and services)
     174,000      Gucci Group N.V.                   12,136,500
                  (retail - apparel)
     46,000       Hunter Douglas N.V.(2)             4,063,901
                  (building
                  and home improvements)
     1,049,559    ING Groep N.V.                     46,444,053
                  (financial services)
     214,200      Koninklijke Ahold NV               16,288,846
                  (retail - food and drug)
     710,000      Phillips Electronics N.V.          39,760,000
                  (electrical
                  and electronic components)
     206,500      Randstad Holdings N.V.             20,772,699
                  (business services
                  and supplies)
     590,900      Stork N.V.                         26,178,724
                  (business services
                  and supplies)
     1,309,000    VNU Tijdschriftengroep
                  Nederland                          29,610,445
                                                     -----------
                  (printing and publishing)
                                                     238,226,844
                                                     -----------

NORWAY-1.2%
     140,000      Kvaerner ASA                       8,020,332
                   (business services
                  and supplies)
     400,000      Smedvig ASA Cl A                   9,772,673
                  (energy services)
     100,000      Smedvig ASA Cl B                   2,429,127
                                                     -----------
                  (energy services)
                                                     20,222,132
                                                     -----------

SPAIN-1.9%
     225,000      Cortefiel, S.A.                    8,320,638

                   (retail - specialty)
     812,000      Telefonica de Espana               23,449,030
                                                     -----------
                  (communications services)
                                                     31,769,668
                                                     -----------


Shares                                               Value
- ------------------------------------------------------------------
SWEDEN-2.6%
     457,000      Ericsson (L.M.)
                  Telephone Co. ADR                  $16,309,188
                  (communications equipment)
     300,000      Hennes & Mauritz AB Cl B           9,806,835
                  (retail - apparel)
     506,000      Skandia Forsakrings AB             17,881,129
                                                     -----------
                  (insurance)
                                                     43,997,152
                                                     -----------

SWITZERLAND-9.8%
     322,000      Credit Suisse Group(2)             40,506,370
                  (financial services)
     8,000        Julius Baer Holding AG             11,012,031
                   (financial services)
     18,000       Nestle S.A.                        22,420,382
                  (food and beverage)
     46,600       Novartis AG                        63,320,595
                  (pharmaceuticals)
     2,800        Roche Holding AG                   24,928,521
                                                     -----------
                  (pharmaceuticals)
                                                     162,187,899
                                                     -----------

UNITED KINGDOM-11.4%
     2,249,554    BBA Group plc                      12,336,841
                  (diversified)
     1,741,720    British Aerospace plc              35,480,208
                  (aerospace and defense)
     603,700      British-Borneo Petroleum
                  Syndicate plc                      12,570,030
                  (energy production
                  and marketing)
     427,000      Cable & Wireless plc               3,493,332
                  (communications equipment)
     1,294,000    Cairn Energy plc(2)                11,106,121
                  (energy production
                  and marketing)
     1,400,000    Granada Group plc                  19,888,774
                  (diversified)
     1,100,000    Guinness plc                       10,261,630
                  (food and beverage)
     1,098,979    Misys plc                          24,549,199
                  (computer software
                  and services)
     1,390,000    Next Plc                           16,898,081
                  (retail - apparel)


See Notes to Financial Statements


Semiannual Report                                    Schedule of Investments   9



                            SCHEDULE OF INVESTMENTS
                              INTERNATIONAL GROWTH


MAY 31, 1997 (UNAUDITED)

Shares/Principal Amount                              Value
- ------------------------------------------------------------------
     989,000      Royal Bank of Scotland
                  Group plc                          $9,728,793
                  (banking)
     1,241,904    Siebe plc                          19,536,395
                  (diversified)
     1,202,596    Stagecoach Holdings plc            13,190,380
                  (transportation)                   -------------

                                                     189,039,784
                                                     -------------

TOTAL COMMON STOCKS-94.0%                            1,559,168,947
                                                     -------------
  (Cost $1,306,305,049)


PREFERRED STOCKS
BRAZIL-1.7%
     203,000      Telecomunicacoes
                  Brasileiras S.A. ADR               27,887,125
                                                     -----------
                  (communications services)

GERMANY-1.2%
     281,700      Henkel KGaA                        15,922,533
                  (chemicals and resins)
     21,000       SAP AG                             3,829,375
                                                     -----------
                  (computer software
                  and services)
                                                     19,751,908
                                                     -----------

TOTAL PREFERRED STOCKS-2.9%                          47,639,033
                                                     -----------
  (Cost $23,473,402)


TEMPORARY CASH INVESTMENTS

$45,982,000 par value FHLMC Discount                 45,904,725
      Note, 5.43%, 6/12/97(4)

Repurchase Agreement, Morgan
         (J.P.) & Co. Inc.,
       5.50%, due 6/2/97,
       collateralized by $5,040,000
       par value U.S. Treasury Notes,
      11.125%, due 8/15/03
       (Delivery value $6,202,842)                   6,200,000
                                                     -----------


Principal Amount                            Value
- ------------------------------------------------------------------
TOTAL TEMPORARY
CASH INVESTMENTS-3.1%                                $52,104,725
                                                     -----------

  (Cost $52,104,725)

TOTAL INVESTMENT SECURITIES-100.0%                   $1,658,912,705
                                                     ==============


  (Cost $1,381,883,176)


FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS

     Contracts             Settlement                         Unrealized
     to Sell               Dates            Value             (Loss)
- ----------------------     ------------     ------------      ------------
     56,760,375   CHF      6/30/97          $ 40,312,480      $(1,441,356)
     69,753,911   DEM      6/30/97          40,976,996           (248,800)
     132,819,000  FRF      6/30/97          23,094,097           (84,779)
     18,585,475   GBP      6/30/97          30,453,416           (304,960)
     100,832,210  NLG      6/30/97          52,648,123           (245,613)
                                            ------------      ------------
                                            $187,485,112      $(2,325,508)
                                            ============      ============
(Value on Settlement Date $185,159,604)

NOTES TO SCHEDULE OF INVESTMENTS

ADR = American Depositary Receipt
CHF = Swiss Franc
DEM = German Mark
FHLMC = Federal Home Loan Mortgage Corporation 
FRF = French Franc 
GBP = British Pound 
GDR = Global Depositary Receipt 
JPY = Japanese Yen 
NLG = Netherlands Guilder
(1)  Country was less than 0.05% of the Fund's total investment securities.
(2)  Non-income producing.
(3) Security was purchased  under Rule 144A of the  Securities  Act of 1933 and,
unless registered under the Act or exempted from registration,  may only be sold
to  qualified  institutional   investors.  The  aggregate  value  of  restricted
securities  at May 31,  1997,  was  $4,322,371,  which  represented  0.3% of net
assets.
(4)  The rates for U.S. Government Agency discount notes are
     the yield to maturity at May 31, 1997.

See Notes to Financial Statements

10   Schedule of Investments                        American Century Investments



                            INTERNATIONAL DISCOVERY


TOTAL RETURNS AS OF MAY 31, 1997
                                                        AVERAGE ANNUAL RETURNS
                             6 MONTHS      1 YEAR     3 YEARS    LIFE OF FUND(1)


International Discovery ..... 15.14%        23.42%     17.04%     19.63%
Lipper International
Small Company Funds .........  6.81%        10.11%      7.80%      7.90%(2)
MSCI EAFE(R)Index ...........  4.04%         7.54%      7.69%      8.49%
S&P 500 ..................... 13.17%        29.48%     25.99%     26.12%


(1) The fund's inception was 4/1/94.
(2) For the period from 4/7/94 (the date nearest the fund's  inception for which
data are available) to 5/31/97.

See pages 36 and 37 for more  information  about  the  comparative  indices  and
returns.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND


                         INTERNATIONAL     LIPPER INT'L
                         DISCOVERY         SMALL CO          EAFE(R)
DATE                     ACCT VALUE        ACCT VALUE        ACCT VALUE

Apr 30, 94                 10000            10000             10000
Jun 30, 94                 10000            9806              10083
Sep 30, 94                 10613            10008             10093
Dec 31, 94                 10000            9408              9990
Mar 31, 95                 9387             8995              10176
Jun 30, 95                 10242            9454              10250
Sep 30, 95                 10967            10086             10677
Dec 31, 95                 10989            10059             11110
Mar 31, 96                 12017            10798             11431
Jun 30, 96                 13456            11516             11611
Sep 30, 96                 13531            11328             11597
Dec 31, 96                 14416            11737             11781
Mar 31, 97                 15532            12049             11597
May 31, 97                 16355            12547             12417


Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing  International Discovery's total return includes operating
expenses (such as transaction  costs and management  fees) that reduce  returns,
while the total return lines of the indices do not.

PORTFOLIO AT A GLANCE

                           5/31/97          11/30/96
Number of Companies        160              183
Portfolio Turnover         65%(1)           130%(2)
Expense Ratio              1.75%(3)         1.88%

(1) Six months ended 5/31/97.
(2) Year ended 11/30/96.
(3) Annualized.

Semiannual Report                                   International Discovery   11


                            INTERNATIONAL DISCOVERY


MANAGEMENT Q & A

     An interview  with Henrik Strabo and Mark Kopinski,  portfolio  managers on
the International Discovery investment team.

How did International Discovery perform for the six months ended May 31, 1997?

     The fund  performed  very well. Its total return was 15.14% while the total
return  of  EAFE(R),  its  benchmark,  was just  4.04%.  In fact,  International
Discovery has outperformed  EAFE(R) over the three-year  period since the fund's
inception.

     Furthermore,  the fund  significantly  outperformed its peers.  Morningstar
ranked  International  Discovery in the top 3% of 398 funds in its foreign stock
funds category, based on the fund's 1997 year-to-date returns as of May 31.

What factors contributed to the fund's strong performance?

     First and foremost,  our investment  approach  worked.  We sought and found
successful  companies  that  are  able to grow  their  businesses  due to  great
products, strong competitive positions and experienced management.

     Secondly,  the performance gap for the reporting period can be explained in
part by the fund's larger relative position in Europe than the index's,  and its
smaller relative positions in Japan and Far Eastern countries. As of May 31, 59%
of the  fund's  investments  were  invested  in Europe  and the  fund's top five
investments  by  country  were all  European,  as the  chart  on page 14  shows.
European  stocks  rallied  during  the  period  because  of  favorable  economic
conditions - falling  interest rates,  low inflation and optimism about European
Monetary Union (EMU) in 1999.

     European  equity  performance  also  reflected  the  fact  that  a  growing
investing  population in Europe has put increased pressure on European companies
to  improve  their  financial  performance.  This may  fundamentally  change how
companies are run and shareholders  are treated.  Companies are chopping away at
fat,  they're starting to buy back shares,  and they're  beginning to distribute
stock options to executives to tie their fate to that of shareholders.

The Netherlands has appeared at or near the top of the fund's country weightings
for the past year. Why?

     The Netherlands has a long history as the center of trade for Europe and is
home to some of the fastest-growing,  most profitable businesses in the world. A
good example is Kempen & Co, a Dutch  financial  services  firm. As of May 31 it
was the fund's fifth-largest  holding and one of the portfolio's best performing
stocks for the six-month  period.  Kempen's growth and  performance  reflect the
increasing investment sophistication and participation of European citizens.

Why was the fund underweighted in Japanese stocks?

The  relative  absence  of  corporate  earnings  growth,  except in  export  and
technology-driven  industries,  caused us to focus on  faster-growing  companies
elsewhere in the world. Even


[bar graph - data below]

INTERNATIONAL DISCOVERY'S ONE-YEAR RETURNS
(Periods ended May 31)

                 INTL DIS    EAFE

     1994        9.80%(1)    3.64%(1)
     1995       -2.37%       4.93%
     1996          33%      10.67%
     1997       23.42%       7.54%



This chart  illustrates the fund's returns over the past four years and compares
them with EAFE(R)'s  returns.  International  Discovery's  total returns include
operating  expenses,  while  the  index's  returns  do  not.  See  page 36 for a
description of EAFE(R). Past performance is no guarantee of future results.

(1) Return from 4/1/94 inception date to 5/31/94.



12 International Discovery                          American Century Investments


though Japan's stock market is the  second-largest in the world (behind only the
U.S.) and makes up about 45% of the non-American global equity market,  Japanese
holdings accounted for only 6% of the fund's portfolio as of May 31.

Why were you underweighted in Far Eastern countries?

     Again, it was the absence of corporate earnings growth and the fact that we
found  more  promising  opportunities  in  Europe  and  elsewhere.   The  fund's
relatively  low exposure to  countries  such as Thailand,  the  Philippines  and
Singapore paid off when these markets were among the worst performers during the
period.  This is ironic because not too long ago these countries were investment
darlings,  often  referred  to as "Tiger"  countries.  They  benefited  from the
earlier strength of the Japanese yen, when Japan was investing  heavily overseas
and Far Eastern goods and services appeared relatively  inexpensive.  As the yen
has declined, so too has the relative competitiveness of these Tiger countries.

     During the past two  decades,  these  countries  were also  attractive  for
industrial nations because they could provide  inexpensive labor.  However,  the
collapse of communism  created other sources of low-cost labor,  such as eastern
Europe.

Three of the fund's top performing  securities  were Hong Kong "red chips." What
are red chips?

     Red chips are  securities  of  companies  (listed  and traded in Hong Kong)
created by the Chinese  government  to raise  capital  for  financially-strapped
provincial  governments  with marketable  assets.  These assets can include such
things as roads,  hotels and  factories.  The three examples that have performed
well for the fund are Beijing  Enterprises,  Guangnan  Holdings,  and  Guangzhou
Investment Company.

What factor could pose the biggest threat to the fund's  performance  during the
rest of 1997?

     The fund's short-term performance could be affected most by rising interest
rates and falling stock prices in Europe caused by uncertainty  over EMU. Europe
is supposed to be united  economically  under a single  currency,  the euro,  on
January  1, 1999,  but that  timetable  may be  threatened  by recent  political
developments.

     After the recent French parliamentary elections, which concluded just after
the close of the fund's May 31 reporting  period,  France and Germany - Europe's
two largest  economies - appeared  headed in opposite  directions on EMU. French
voters,  fed up with high  unemployment  caused  in part by strict  EMU-required
spending restrictions, elected a new government that supports increased


TOP TEN HOLDINGS                    % of fund investments
                                    As of            As of
                                    5/31/97          11/30/96
Marschollek, Lautenschlaeger
 und Partner AG                     3.3%             2.4%
Internatio-Muller NV                2.3%             2.2%
Porsche AG                          1.9%             1.6%
Esselte AB CI B                     1.8%             2.2%
Kempen & Company NV                 1.7%             1.1%
Royal Group Technologies Ltd.       1.7%             -
Newcourt Credit Group Inc.          1.6%             1.9%
Rieter Holdings Ltd.                1.6%             -
Getinge Industrier AB               1.6%             2.1%
Georg Fischer AG                    1.5%             -


See the Schedule of Investments for company nationalities and descriptions.


TOP FIVE INDUSTRIES                 % of fund investments
                                    As of            As of
                                    5/31/97          11/30/96
Computer Software & Services        8.4%             7%
Financial Services                  7.7%             10%
Electrical
  & Electronic Components           5.4%             1%
Business Services & Supplies        5.4%             6%
Banking                             5.3%             5%


Semiannual Report                                   International Discovery   13


                            INTERNATIONAL DISCOVERY

spending  and  weaker  economic  restrictions.  That  conflicts  with  Germany's
position that EMU start on solid economic foundations,  requiring the structural
reforms and welfare cutbacks that French voters rebelled against.

     This clash of wills could  delay EMU,  which  might  shake  European  stock
markets.  For the better  part of two  years,  European  stock and bond  markets
rallied as countries  cut deficits to meet EMU  requirements  and  investors bet
that  interest  rates  throughout  Europe would fall,  or converge,  with German
interest rates.  Now, with the possibility that  deficit-reduction  requirements
might loosen,  there's a concern that interest rates could rise and stock prices
might fall. We are preparing for the possibility of short-term market gyrations,
but in the  longer-term  we  believe  we own the  types of  companies  that will
perform well regardless of what happens with EMU.

Given the  uncertainties  of global  investing  and the recent  strength  of the
U.S.  stock market,  why invest  overseas?  Why not simply invest in a good U.S.
equity fund?

     The   investment   opportunities   we  see  today   around  the  globe  are
unprecedented.  The case for international equity investing may be stronger than
ever  for  investors  seeking  long-term  growth  and  diversification  for  the
following reasons:

     o New  opportunities.  The investment world is growing larger.  New markets
are opening up in Eastern Europe and Africa, for example. In addition,  emerging
small companies are developing interesting new products.

     o Increasing demand from individual  investors.  Individual investing is on
the rise around the world.  We're  starting to see  buildups of private  capital
being invested globally.

     o A global shift from saving to investing.  Low interest  rates,  faltering
pension  programs and increasing  awareness of what's required to meet long-term
investment  goals are causing  individual  investors to withdraw money from bank
products and move it into equities.

     o Increased  equity demand to stem a looming pension  crisis.  The unfunded
pension  liabilities around the world are huge. By 2010, the ratio of workers to
retirees will drop to critical levels in mature  economies such as Japan,  Great
Britain, Germany and France. These countries need to start funding pension plans
earlier and investing in them more aggressively.

     We believe a U.S.  equity fund is a logical  starting point and a good core
holding for investors with  long-term  goals who can tolerate  short-term  price
fluctuations.  However, investors who already have core holdings and are seeking
diversification  and strong  growth  potential  should  find that  international
equity funds offer the  opportunity to benefit from a variety of exciting global
growth trends. (Please note that international investing involves special risks,
including political instablility and currency fluctuations.)

[bar chart - data below]

INTERNATIONAL DISCOVERY'S INVESTMENTS BY COUNTRY

                  5/31/97           11/30/96
Netherlands       16%               13%
U.K.              12%               14%
Germany           9%                7%
Switzerland       8%                1%
Sweden            7%                8%
Japan             6%                7%
Canada            5%                3%
Finland           5%                5%
Other*            34%               42%

*No other country represented more than 5% of the fund as of 5/31/97.


14   International Discovery                        American Century Investments


                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
COMMON STOCKS
AUSTRALIA-0.8%
     1,500,000    Reinsurance Australia
                  Corporation Ltd.                   $4,736,291
                                                     -------------
                  (insurance)

BRAZIL-0.9%
     21,170,000   Companhia de Eletricidade
                  do Estado da Bahia(1)              1,779,823
                  (utilities)
     14,700,000   Companhia de Saneamento
                  Basico do Estado
                  de Sao Paulo(1)                    3,502,321
                                                     -------------
                  (utilities)
                                                     5,282,144
                                                     -------------

CANADA-5.0%
     250,000      ATS Automation Tooling
                  Systems, Inc.                      4,374,977
                  (industrial machinery
                  and equipment)
     160,000      Leitch Technology Corp.            3,793,341
                  (electrical
                  and electronic components)
     400,000      Newcourt Credit Group, Inc.
                  (Acquired 12/4/95
                  through 4/10/97,
                  Cost $3,480,944)(2)                9,352,649
                   (financial services)
     400,000      Royal Group
                  Technologies Ltd.(1)               9,788,331
                  (building
                  and home improvements)
     147,600      YBM Magnex
                  International Inc.(1)              1,484,414
                                                     -------------
                   (steel)
                                                     28,793,712
                                                     -------------

DENMARK-2.4%
     100,000      Bang & Olufsen Holding A/S         5,983,695
                  (consumer products)
     20,000       Christian Hansen
                  Holding A/S Cl B                   2,399,631
                  (pharmaceuticals)
     21,000       Falck A/S                          5,754,891
                                                     -------------
                  (aerospace and defense)
                                                     14,138,217
                                                     -------------

Shares                                               Value
- ------------------------------------------------------------------

EGYPT-0.7%
     70,000       A-Ahram Beverages
                  Co. GDR(1)                         $1,202,250

                  (food and beverage)
     38,690       Eastern Tobacco                    885,732
                  (tobacco)
     30,000       Egypt International
                  Pharmaceuticals(1)                 1,778,932
                  (pharmaceuticals)
     4,755        Torah Portland Cement Co.          120,640
                                                     -------------
                  (construction and
                   property development)
                                                     3,987,554
                                                     -------------

FINLAND-4.5%
     320,000      Hansabank Ltd.                     3,045,991
                  (banking)
     127,300      Huhtamaki Group                    5,588,811
                  (food and beverage)
     95,000       Instrumentarium
                  Group Cl A                         3,986,208
                  (medical equipment
                  and supplies)
     45,000       OY Hartwall AB                     2,098,004
                  (food and beverage)
     170,000      Pohjola Insurance
                  Group Cl B                         4,953,620
                  (insurance)
     80,000       TT Tieto OY                        6,744,694
                                                     -------------
                  (computer software
                  and services)
                                                     26,417,328
                                                     -------------

FRANCE-3.2%
     10,000       Altran Technologies SA             3,211,415
                  (business services
                  and supplies)
     9,985        FDM Pharma(1)                      396,925
                  (pharmaceuticals)
     155,000      Companie Generale
                   de Geophysique, SA(1)             2,538,125
                  (energy services)
     60,000       Havas Advertising SA               6,374,225
                  (broadcasting and media)
     105,000      Vallourec SA                       6,014,894
                                                     -------------
                  (steel)
                                                     18,535,584
                                                     -------------


See Notes to Financial Statements

Semiannual Report                                   Schedule of Investments   15


                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
GERMANY-5.4%
     16,000       Barmag AG(1)                       $2,790,970
                  (machinery and equipment)
     100,000      Boewe Systec AG                    3,623,571
                  (machinery and equipment)
     105,000      Kiekert AG(1)                      4,549,692
                  (automobiles
                  and auto parts)
     270,000      Pfeiffer Vacuum
                   Technology AG ADR(1)              6,108,750
                   (industrial equipment
                  and machinery)
     9,250        Porsche AG                         11,172,677
                   (automobiles
                  and auto parts)
     23,000       Rhoen Klinikum AG                  2,818,528
                                                     -------------
                  (healthcare)
                                                     31,064,188
                                                     -------------

HONG KONG-2.9%
     400,000      Beijing Enterprises
                  Holdings Ltd.(1)                   2,333,355
                  (diversified)
     1,900,000    Guangnan Holdings                  3,052,849
                  (food and beverage)
     9,000,000    Guangzhou Investments
                  Company Ltd.                       4,471,833
                   (diversified)
     1,600,000    Peregrine Investments
                   Holdings Limited                  2,849,584
                   (financial services)
     11,000,000   Top Glory International
                  Holdings Ltd.(1)                   2,328,193
                   (diversified)
     5,400,000    Zhejiang Expressway Co. Ltd.
                  (Acquired 5/12/97
                  through 5/29/97,
                  Cost $1,817,422)(1)(2)             1,951,345
                                                     -------------
                  (construction and
                  property development)
                                                     16,987,159
                                                     -------------

HUNGARY-0.7%
     36,000       Richter Gedeon Rt.                 2,994,582
                  (pharmaceuticals)


Shares                                               Value
- ------------------------------------------------------------------
     14,000       Richter Gedeon Rt.
                  (Acquired 5/22/97,
                  Cost $1,092,000)(2)                $1,164,560
                                                     -------------
                  (pharmaceuticals)
                                                     4,159,142
                                                     -------------

INDIA-0.6%
     40,000       Gujarat Ambuja Cements Ltd.        298,630
                  (construction and
                  property development)
     2,050        Indian Hotels
                  Company Limited                    34,659
                  (leisure)
     40,000       Larsen & Toubro Ltd.               238,188
                  (business services
                  and supplies)
     100,000      Mahindra & Mahindra Ltd.           974,280
                  (automobiles
                  and auto parts)
     130,000      NIIT Limited                       1,315,201
                  (computer software
                  and services)
     170,000      Oriental Bank
                  of Commerce(1)                     357,632
                                                     -------------
                  (banking)
                                                     3,218,590
                                                     -------------

INDONESIA-0.3%
     1,023,000    PT Bank Bira                       1,565,924
                                                     -------------
                  (banking)

IRELAND-0.4%
     103,000      Ryanair Holdings plc ADR(1)        2,562,125
                                                     -------------
                  (airlines)

ISRAEL-2.9%
     240,000      Bio-Technology
                  General Corporation(1)             3,450,000
                  (pharmaceuticals)
     210,000      Orckit Communications Ltd.(1)      2,808,750
                  (communications equipment)
     500,000      Oshap Technologies, Ltd.(1)        3,656,250
                  (computer software
                  and services)
     230,500      Technomatix Technologies
                  Ltd. ADR(1)                        7,116,688
                                                     -------------
                  (computer software
                  and services)
                                                     17,031,688
                                                     -------------


See Notes to Financial Statements

16   Schedule of Investments                        American Century Investments


                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
ITALY-0.8%
     200,000      Safilo S.p.A.(1)                   $4,378,763
                                                     -------------
                  (medical equipment
                  and supplies)

JAPAN-5.9%
     245,000      Canon Copyer Sales Co.             2,551,315
                  (office equipment
                  and supplies)
     85,000       DeoDeo Corporation                 1,792,246
                  (retail - specialty)
     49,000       Fast Retailing Co. Ltd.            1,589,827
                  (retail - apparel)
     44,000       Fujimi Incorporated                2,597,702
                  (electrical
                  and electronic components)
     105,000      Kansai Kosaido Co. Ltd.            1,328,370
                  (printing and publishing)
     165,000      Kanto Biomedical Laboratory        2,272,043
                  (healthcare)
     145,000      Laox                               2,171,350
                  (retail - specialty)
     75,000       Matsumotokiyoshi                   2,975,601
                  (retail - food and drug)
     145,000      Meitec                             3,831,060
                  (computer software
                  and services)
     70,000       Ministop Co., Ltd.                 2,229,012
                  (retail - food and drug)
     100,000      Misumi Corporation                 2,323,680
                  (machinery and equipment)
     43,000       Nichii Gakkan Company              2,294,419
                  Nippon Kanzai                      783,855
                  (business services)
     120,000      Nippon System Development          2,220,405
                  (computer software
                  and services)
     30,000       Noritsu Koki Co. Limited           1,381,299
                  (electrical
                  and electronic components)
     10,000       Otsuka Kagu Limited                834,803
                  (retail - specialty)
     55,000       Royal Co. Ltd.                     1,079,220
                                                     -------------
                  (restaurants)
                                                     34,256,207
                                                     -------------


Shares                                               Value
- ------------------------------------------------------------------
LUXEMBOURG-0.4%
     37,300       Vilniaus Bankas AB GDR
                  (Acquired 12/10/96
                  through 5/1/97,
                   Cost $1,603,125)(2)               $2,144,750
                                                     -------------
                  (banking)

MALAYSIA-0.6%
     400,000      MBF Capital Bhd                    851,572
                  (financial services)
     500,000      MBM Resources Berhad               1,163,947
                  (automobiles and auto parts)
     277,000      Reliance Pacific Berhad            434,294
                  (leisure)
     750,000      United Merchant Group(1)           1,193,792
                                                     -------------
                  (financial services)
                                                     3,643,605
                                                     -------------

MEXICO-1.2%
     500,000      ARA, S.A. de C.V.(1)               1,636,341
                  (construction and
                  property development)
     520,000      Corporacion Interamericana
                  de Entretenimiento S.A.(1)         2,102,603
                  (leisure)
     170,000      Grupo Elektra, S.A.
                  de C.V. GDR                        3,230,000
                                                     -------------
                  (retail - general merchandise)
                                                     6,968,944
                                                     -------------

NETHERLANDS-15.7%
     55,000       Aalberts Industries N.V.           1,447,670
                  (diversified)
     120,000      Apothekers Cooperatie OPG          3,658,918
                  (pharmaceuticals)
     55,000       Cap Gemini N.V.                    1,935,005
                  (computer software
                  and services)
     119,635      Draka Holding N.V.                 5,050,784
                  (electrical
                  and electronic components)
     134,193      Fugro N.V.                         3,154,438
                  (business services
                  and supplies)
     43,000       Goudsmit NV                        5,871,990
                  (business services
                  and supplies)



See Notes to Financial Statements

Semiannual Report                                   Schedule of Investments   17

                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
     410,000      Internatio-Muller NV               $13,206,505
                  (transportation)
     101,000      IHC Calland N.V.(1)                5,464,297
                  (energy services)
     322,800      Kempen & Company NV                9,859,314
                  (financial services)
     40,000       Koninklijke Arend Groep NV         2,533,097
                  (furniture and furnishings)
     150,000      Koninklijke Boskalis
                  Westminster N.V.                   3,158,553
                  (construction and
                  property development)
     175,151      Koninklijke Pakhoed NV             5,933,918
                  (transportation)
     160,000      Koninklijke Van Ommeren N.V.       6,496,404
                  (transportation)
     46,406       Nagron Nationaal
                  Grondbezit N.V.                    4,970,516
                  (construction and
                  property development)
     82,800       Ordina Beheer N.V.(1)              6,223,163
                  (computer software
                  and services)
     145,000      QIAGEN N.V.(1)                     5,618,750
                  (biotechnology)
     30,000       Samas Groep N.V.                   1,141,457
                  (office equipment
                  and supplies)
     75,000       Schuttersveld Holding NV           3,420,463
                  (diversified)
     20,088       Simac Techniek N.V.                1,638,576
                                                     -------------

                  (computer software
                  and services)
                                                     90,783,818
                                                     -------------


NORWAY-3.1%
     250,000      Aker Maritime ASA                  4,194,808
                  (energy services)
     60,000       Blom ASA                           2,169,365
                  (energy services)
     160,000      Nordlandsbanken                    3,841,671
                  (banking)
     330,000      Tandberg Television ASA(1)         3,011,837
                  (communications equipment)
     200,000      Tomra Systems ASA                  4,577,430
                                                     -------------

                  (environmental services)
                                                     17,795,111
                                                     -------------


Shares                                               Value
- ------------------------------------------------------------------
PERU-0.4%
     100,000      Credicorp Limited                  $2,262,500
                                                     -------------
                  (financial services)

PHILIPPINES-0.5%
     2,800,000    International Container
                  Terminal Services, Inc.(1)         1,512,796
                  (transportation)
     7,418,000    Solid Group, Inc.                  1,392,194
                                                     -------------
                  (electrical
                  and electronic components)
                                                     2,904,990
                                                     -------------

POLAND-1.5%
     66,000       Agros Holding S.A.(1)              1,747,214
                  (food and beverage)
     65,800       Computerland Poland S.A.           1,822,939
                  (computer systems)
     270,000      Elektrim Spolka
                  Akcyjna S.A.                       2,377,024
                  (electrical
                  and electronic components)
     55,000       Elektrobudowa SA(1)                931,170
                  (electrical
                  and electronic components)
     48,000       OPTIMUS S.A.                       1,551,438
                                                     -------------
                  (computer systems)
                                                     8,429,785
                                                     -------------

PORTUGAL-0.7%
     325,000      Companhia de Seguros
                  Mundial Confianca, SA(1)           4,305,732
                                                     -------------
                  (insurance)

SINGAPORE-1.9%
     949,000      Datacraft Asia Limited             2,884,960
                  (communications services)
     370,000      Elec & Eltek International
                  Company Ltd.                       2,183,000
                  (electrical
                  and electronic components)
     1,200,000    Parkway Holdings Ltd.              5,955,959
                                                     -------------
                  (real estate)
                                                     11,023,919
                                                     -------------


See Notes to Financial Statements

18   Schedule of Investments                        American Century Investments


                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
SWEDEN-6.5%
     350,000      Investment AB Bure                 $4,341,366
                  (diversified)
     430,000      Esselte AB Cl B                    10,167,322
                  (business services
                  and supplies)
     500,000      Getinge Industrier AB              9,076,814
                  (medical equipment
                  and supplies)
     95,000       Hexagon AB                         2,663,609
                  (diversified)
     110,000      Ortivus AB Cl B(1)                 4,235,416
                  (medical equipment
                  and supplies)
     15,200       OXiGENE, Inc.(1)                   505,400
                  (biotechnology)
     75,833       Pricer AB Cl B(1)                  2,772,884
                  (electrical
                  and electronic components)
     70,000       Scandic Hotels AB(1)               1,302,410
                  (leisure)
     150,000      Spectra-Physics AB                 2,577,686
                                                     -------------
                  (medical equipment
                  and supplies)
                                                     37,642,907
                                                     -------------

SWITZERLAND-7.0%
     6,000        Georg Fischer AG                   8,577,495
                  (automobiles and auto parts)
     1,000        Gurit-Heberlein AG                 3,113,942
                  (chemicals and resins)
     28,000       Rieter Holdings Ltd.               9,115,357
                  (machinery and equipment)
     500          SIG Schweizerische
                  Industrie-Gesellschaft
                  Holding AG                         1,503,892
                  (industrial equipment
                  and machinery)
     21,000       Swisslog Holding AG(1)             7,430,998
                  (machinery and equipment)
     240,000      TAG Heuer International
                  SA ADR(1)                          3,420,000
                  (retail - specialty)
     10,000       TEGE S.A.(1)                       1,542,817
                  (food and beverage)
     9,500        Vontobel Holding AG CI B           6,185,421
                                                     -------------
                  (financial services)
                                                     40,889,922
                                                     -------------

Shares                                               Value
- ------------------------------------------------------------------
UNITED KINGDOM-12.0%
     600,000      Ashtead Group plc                  $3,049,470
                  (industrial machinery
                  and equipment)
     219,500      Azlan Group plc                    2,168,218
                  (computer software
                  and services)
     290,000      Biocompatibles
                  International plc(1)               6,180,915
                  (biotechnology)
     350,000      Blacks Leisure Group PLC           3,095,786
                  (retail - apparel)
     375,033      Bodycote International plc         4,580,756
                  (diversified)
     1,140,000    Capita Group Plc                   4,672,575
                  (business services
                  and supplies)
     600,000      Caspian Group plc(1)               238,547
                  (business services
                  and supplies)
     1,000,000    Celsis International Plc(1)        1,672,290
                  (pharmaceuticals)
     300,000      Cobham PLC                         3,221,617
                  (aerospace and defense)
     2,500,000    Corporate Services
                  Group plc                          7,439,231
                  (business services
                  and supplies)
     100,000      Dr. Solomon's
                  Group Plc ADR(1)                   2,031,250
                  (computer software
                  and services)
     300,000      Go-Ahead Group PLC (The)           2,134,629
                  (transportation)
     370,000      Goode Durrant plc                  2,750,999
                  (automobiles
                  and auto parts)
     255,000      JBA Holdings Plc                   3,971,689
                  (computer software
                  and services)
     225,000      J.D. Weatherspoon plc              4,860,093
                  (food and beverage)
     700,000      London International
                  Group plc                          1,945,267
                  (pharmaceuticals)
     1,075,000    M.A.I.D. plc(1)                    3,286,993
                  (business services
                  and supplies)
     450,000      Parity plc                         4,131,540
                  (business services
                  and supplies)
     417,500      PizzaExpress plc                   4,671,653
                  (restaurants)
     320,000      Sage Group plc (The)               3,428,522
                                                     -------------

                  (computer software
                  and services)
                                                     69,532,040
                                                     -------------


See Notes to Financial Statements

Semiannual Report                                   Schedule of Investments   19

                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY



MAY 31, 1997 (UNAUDITED)


Shares                                               Value
- ------------------------------------------------------------------
UNITED STATES-1.2%
     260,000      Rofin-Sinar Technologies
                  Inc.(1)                            $3,997,500
                  (electrical
                  and electronic components)
     145,000      Zoran Corporation(1)               2,999,688
                                                     -------------
                  (computer software
                  and services)
                                                     6,997,188
                                                     -------------

TOTAL COMMON STOCKS-90.1%                            522,439,827
                                                     -------------
  (Cost $438,167,202)


PREFERRED STOCKS & RIGHTS
BRAZIL-2.1%
     80,000       Bompreco S.A. Supermercados
                  do Nordeste GDR
                  (Acquired 2/12/97
                  through 5/29/97,
                  Cost $1,866,375)(2)                1,816,000
                   (retail - food and drug)
     1,500,000    Cia Riograndense Telecom(1)        2,058,383
                  (communications services)
     80,000,000   Ericsson
                  Telecomunicacoes S.A.              4,483,886
                  (communications equipment)
     66,775       Saraiva Sa-Livreiros Edit          474,068
                  (banking)
     20,000,000   Telecomunicacoes
                  de Minas Gerais                    3,043,438
                  (communications services)
     248,067      Telecomunicacoes
                  de Minas Gerais Rights             2,218
                                                     -------------
                  (communications services)
                                                     11,877,993
                                                     -------------

GERMANY-3.8%
     13,877       Fresenius AG                       3,073,201
                  (medical equipment
                  and supplies)
     80,000       Marschollek,
                  Lautenschlaeger
                  und Partner AG                     19,231,897
                                                     -------------
                  (financial services)
                                                     22,305,098
                                                     -------------


Shares                                               Value
- ------------------------------------------------------------------
SWITZERLAND-0.6%
     6,000        Liechtenstein
                  Global Trust AG                    $3,473,461
                                                     -------------
                  (financial services)

TOTAL PREFERRED STOCKS & RIGHTS-6.5%                 37,656,552
                                                     -------------
  (Cost $20,364,086)


TEMPORARY CASH INVESTMENTS --3.4%

Repurchase Agreement,
Morgan (J.P.) & Co. Inc.,
  5.50%, due 6/2/97, collateralized
  by $15,849,000 par value
     U.S. Treasury Notes,
  11.125%, due 8/15/03
  (Delivery value $19,508,938)                       19,500,000
                                                     -------------
  (Cost $19,500,000)

TOTAL INVESTMENT SECURITIES-100.0%                   $579,596,379
  (Cost $478,031,288)                                ============


FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS
     Contracts             Settlement                         Unrealized
     to Sell               Dates            Value             (Loss)
- -------------------------------------       ------------      ------------

     14,669,664   CHF      6/30/97          $10,418,721        $(326,540)
     23,725,495   DEM      6/30/97          13,937,563         (67,192)
     28,057,221   FRF      6/30/97          4,878,490          (19,700)
     5,624,101    GBP      6/30/97          9,215,427          (92,283)
     39,674,601   NLG      6/30/97          20,715,536         (92,640)
     55,997,090   SEK      6/30/97          7,242,345          (56,129)
                                            -------------     -------------
                                            $66,408,082       $(654,484)
                                            =============     =============
(Value on Settlement Date $65,753,598)


See Notes to Financial Statements

20   Schedule of Investments                        American Century Investments


                            SCHEDULE OF INVESTMENTS
                            INTERNATIONAL DISCOVERY


Notes to Schedule of Investments

ADR = American Depositary Receipt 
CHF = Swiss Franc 
DEM = German Mark 
FRF = French Franc 
GBP = British Pound 
GDR = Global Depositary Receipt 
JPY = Japanese Yen 
NLG = Netherlands Guilder 
SEK = Swedish Krona

(1)  Non-income producing.

(2) Security was purchased  under Rule 144A of the  Securities  Act of 1933 and,
unless registered under the Act or exempted from registration,  may only be sold
to  qualified  institutional   investors.  The  aggregate  value  of  restricted
securities  at May 31, 1997,  was  $16,429,304,  which  represented  2.8% of net
assets.

See Notes to Financial Statements

Semiannual Report                                   Schedule of Investments   21


                      STATEMENTS OF ASSETS AND LIABILITIES


                                               INTERNATIONAL      INTERNATIONAL
                                                  GROWTH            DISCOVERY
MAY 31, 1997 (UNAUDITED)

ASSETS

Investment securities,
at value (identified cost
of $1,381,883,176 and
$478,031,288,
respectively) (Note 3) .................      $1,658,912,705      $  579,596,379

Foreign currency holdings,
at value (identified cost of
$608,257 and $2,505,868,
respectively) ..........................             608,060           2,504,114

Cash ...................................           6,474,883             224,014

Receivable for
investments sold .......................          34,691,539          12,812,872

Receivable for
capital shares sold ....................             650,681             114,022

Dividends
and interest receivable ................           5,744,310           1,124,175
                                              --------------      --------------
                                               1,707,082,178         596,375,576
                                              --------------      --------------
LIABILITIES

Disbursements
in excess of
demand deposit cash ....................             957,742             361,552

Payable for forward
foreign currency
exchange contracts .....................           2,325,508             654,484

Payable for
investments purchased ..................          14,637,581          10,892,083
Payable for
capital shares redeemed ................           2,470,977             146,337

Accrued management
fees (Note 2) ..........................           1,916,948             815,915

Distribution fees
payable (Note 2) .......................               1,277                --

Service fees payable
(Note 2) ...............................               1,277                --

Other liabilities ......................               3,367               6,698
                                              --------------      --------------
                                                  22,314,677          12,877,069
                                              --------------      --------------
Net Assets .............................      $1,684,767,501      $  583,498,507
                                              ==============      ==============


NET ASSETS CONSIST OF:

Capital
(par value and
paid-in surplus) .......................      $1,308,209,155      $  469,150,567

Undistributed
net investment income ..................           4,364,239             702,751

Accumulated undistributed
net realized gain from
investment and foreign
currency transactions ..................          99,088,194          12,884,947

Net unrealized appreciation
on investments and
translation of
assets and liabilities
in foreign currencies
(Note 3) ...............................         273,105,913         100,760,242
                                              --------------      --------------
                                              $1,684,767,501      $  583,498,507
                                              ==============      ==============
INVESTOR CLASS

Net assets .............................      $1,678,633,154      $  583,498,507
Shares outstanding .....................         184,381,190          69,857,535
Net asset value per share ..............      $         9.10      $         8.35

ADVISOR CLASS

Net assets .............................      $    6,134,347                 N/A
Shares outstanding .....................             674,644                 N/A
Net asset value per share ..............      $         9.09                 N/A



See Notes to Financial Statements


22   Statements of Assets and Liabilities           American Century Investments


                            STATEMENTS OF OPERATIONS


                                              INTERNATIONAL       INTERNATIONAL
                                                 GROWTH             DISCOVERY

FOR THE SIX MONTHS ENDED MAY 31, 1997 (UNAUDITED)

INVESTMENT INCOME

INCOME:
Dividends (net of foreign
taxes withheld
of $1,740,975
and $672,853, respectively) ............      $  12,556,197       $   4,893,320

Interest ...............................          1,976,138             261,836
                                              -------------       -------------
                                                 14,532,335           5,155,156
                                              -------------       -------------

EXPENSES (Note 2):

Management fees ........................         12,216,177           4,781,049

Distribution fees
- - Advisor Class ........................              5,801                --

Shareholder services fees
- - Advisor Class ........................              5,801                --

Directors' fees and expenses ...........              8,506               2,905

Fees waived by manager .................         (2,105,848)           (599,815)
                                              -------------       -------------
                                                 10,130,437           4,184,139
                                              -------------       -------------

NET INVESTMENT INCOME ..................          4,401,898             971,017
                                              -------------       -------------

REALIZED AND UNREALIZED GAIN (LOSS) ON
INVESTMENTS AND FOREIGN CURRENCY (NOTE 3)

NET REALIZED GAIN (LOSS) ON:

Investments ............................        113,154,721          17,507,790

Foreign currency transactions ..........        (12,719,484)         (4,294,771)
                                              -------------       -------------
                                                100,435,237          13,213,019
                                              -------------       -------------

CHANGE IN NET UNREALIZED APPRECIATION
(DEPRECIATION) ON:

Investments ............................        142,141,187          66,256,208

Translation of assets
and liabilities in
foreign currencies .....................        (19,130,812)        (13,240,720)
                                              -------------       -------------
                                                123,010,375          53,015,488
                                              -------------       -------------

NET REALIZED AND
UNREALIZED GAIN ON
INVESTMENTS
AND FOREIGN CURRENCY ...................        223,445,612          66,228,507
NET INCREASE IN NET ASSETS
RESULTING FROM OPERATIONS ..............      $ 227,847,510       $  67,199,524
                                              =============       =============


See Notes to Financial Statements


Semiannual Report                                   Statements of Operations  23

<TABLE>
<CAPTION>
                                            STATEMENTS OF CHANGES IN NET ASSETS

                                                   INTERNATIONAL                        INTERNATIONAL
                                                      GROWTH                              DISCOVERY

SIX MONTHS ENDED MAY 31, 1997 (UNAUDITED)
AND YEAR ENDED NOVEMBER 30, 1996

Increase in Net Assets                        1997                1996              1997               1996

OPERATIONS

Net investment
<S>                                   <C>                <C>                <C>                <C>             
income (loss) .....................   $     4,401,898    $      (939,679)   $       971,017    $      (728,664)

Net realized gain
on investments
and foreigncurrency
transactions ......................       100,435,237        149,229,474         13,213,019         24,627,872

Change in net unrealized
appreciation (depreciation)
on investments
and translation of assets
and liabilities in
foreign currencies ................       123,010,375         44,073,881         53,015,488         36,489,864
                                      ---------------    ---------------    ---------------    ---------------

Net increase in net
assets resulting
from operations ...................       227,847,510        192,363,676         67,199,524         60,389,072
                                      ---------------    ---------------    ---------------    ---------------

DISTRIBUTIONS TO SHAREHOLDERS

From net investment income:
     Investor Class ...............            (5,636)        (1,160,402)          (862,734)          (304,720)

In excess of net investment income:
     Investor Class ...............              --                 --                 --             (344,800)

From net realized gains from
investment transactions:
     Investor Class ...............      (140,384,716)              --          (16,063,439)              --

     Advisor Class ................          (405,850)              --                 --                 --
                                      ---------------    ---------------    ---------------    ---------------

Decrease in net assets
from distributions ................      (140,796,202)        (1,160,402)       (16,926,173)          (649,520)
                                      ---------------    ---------------    ---------------    ---------------

CAPITAL SHARE TRANSACTIONS (NOTE 4)

Net increase (decrease)
in net assets from
capital share transactions ........       251,305,698        (55,234,332)       156,096,765        202,809,697
                                      ---------------    ---------------    ---------------    ---------------

NET INCREASE IN NET ASSETS ........       338,357,006        135,968,942        206,370,116        262,549,249

NET ASSETS

Beginning of period ...............     1,346,410,495      1,210,441,553        377,128,391        114,579,142
                                      ---------------    ---------------    ---------------    ---------------

End of period .....................   $ 1,684,767,501    $ 1,346,410,495    $   583,498,507    $   377,128,391
                                      ===============    ===============    ===============    ===============

Undistributed
net investment income .............   $     4,364,239    $       273,167    $       702,751    $       739,552
                                      ===============    ===============    ===============    ===============
</TABLE>


See Notes to Financial Statements

24   Statements of Changes in Net Assets            American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Organization-American Century World Mutual Funds, Inc. (the Corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management  investment  company.  Two  series of funds are  currently  issued as
American Century - Twentieth Century International Growth (International Growth)
and American Century - Twentieth Century International Discovery  (International
Discovery)  (the  Funds).  The Funds'  investment  objective  is to seek capital
growth by investing primarily in equity securities.  The Funds are authorized to
issue three  classes of shares:  the Investor  Class,  the Advisor Class and the
Institutional  Class.  The three classes of shares differ  principally  in their
respective shareholder servicing and distribution expenses and arrangements. All
shares of each Fund  represent  an equal pro rata  interest in the assets of the
class  to  which  such  shares  belong,  and have  identical  voting,  dividend,
liquidation and other rights and the same terms and conditions, except for class
specific  expenses  and  exclusive  rights  to vote on  matters  affecting  only
individual classes. Sale of the Institutional Class for International Growth and
the  Advisor  and  Institutional  Classes for  International  Discovery  had not
commenced as of May 31, 1997.  The following  significant  accounting  policies,
related to all classes of the Funds, are in accordance with accounting  policies
generally accepted in the investment company industry.

     Security  Valuations-  Portfolio securities traded primarily on a principal
securities  exchange are valued at the last reported sales price, or the mean of
the  latest  bid and  asked  prices  where no last  sales  price  is  available.
Securities traded  over-the-counter are valued at the mean of the latest bid and
asked prices or, in the case of certain foreign securities, at the last reported
sales price,  depending on local  convention or regulation.  When valuations are
not readily  available,  securities  are valued at fair value as  determined  in
accordance with procedures adopted by the Board of Directors.

     Security  Transactions- Security transactions are accounted for on the date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

     Investment  Income-Dividend  income less foreign taxes withheld (if any) is
recorded as of the ex-dividend date.  Interest income is recorded on the accrual
basis and includes amortization of discounts and premiums.

     Foreign  Currency  Transactions-The  accounting  records  of the  Funds are
maintained in U.S. dollars.  All assets and liabilities  initially  expressed in
foreign currencies are converted into U.S. dollars at prevailing exchange rates.
Purchases and sales of investment securities,  dividend and interest income, and
certain  expenses  are  translated  at the rates of exchange  prevailing  on the
respective dates of such transactions.

     Net realized foreign currency  exchange gains or losses arise from sales of
portfolio  securities,  sales of foreign currencies,  and the difference between
asset and liability amounts initially stated in foreign  currencies and the U.S.
dollar value of the amounts  actually  received or paid. Net unrealized  foreign
currency  exchange  gains or losses arise from changes in the value of portfolio
securities  and other  assets  and  liabilities  resulting  from  changes in the
exchange rates.

     Net realized  and  unrealized  foreign  currency  exchange  gains or losses
occurring  during the holding period of portfolio  securities are a component of
realized  gain  (loss)  on  foreign   currency   transactions   and   unrealized
appreciation  (depreciation) on translation of assets and liabilities in foreign
currencies, respectively.

     Forward  Foreign  Currency  Exchange  Contracts-The  Funds may  enter  into
forward foreign currency exchange contracts for the purpose of settling specific
purchases or sales of securities  denominated in a foreign  currency or to hedge
the Funds'  exposure  to  foreign  currency  exchange  rate  fluctuations.  When
required, the Funds will segregate assets in an amount sufficient to cover their
obligations  under the hedge  contracts.  The net U.S.  dollar  value of foreign
currency  underlying  all  contractual  commitments  held by the  Funds  and the
resulting  unrealized  appreciation or depreciation  are determined  daily using
prevailing exchange rates.  Forward contracts involve elements of market risk in
excess of the amount reflected in the Statements of Assets and Liabilities.  The
Funds bear the risk of an unfavorable  change in the foreign  currency  exchange
rate  underlying  the forward  contract.  Additionally,  losses may arise if the
counterparties do not perform under the contract terms.

     Repurchase  Agreements-The Funds may enter into repurchase  agreements with
institutions that the Funds'  investment  manager,  American Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost.  The  Funds  require  that  the  securities   purchased  in  a  repurchase
transaction be transferred to the custodian in a manner sufficient to enable the
Funds to obtain those  securities in the event of a default under the repurchase
agreement.  ACIM  monitors,  on a  daily  basis,  the  value  of the  securities
transferred to ensure the value,  including accrued interest,  of the securities
under each repurchase  agreement is equal to or greater than amounts owed to the
Funds under each repurchase agreement.

     Income Tax Status-It is the policy of the Funds to  distribute  all taxable
income and capital gains to shareholders and to otherwise qualify as a regulated
investment company under



Semiannual Report                          Notes to Financial Statements      25


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, (UNAUDITED)

provisions  of the Internal  Revenue  Code.  Accordingly,  no provision has been
made for federal income taxes.

     Distributions to Shareholders-Distributions to shareholders are recorded on
the ex-dividend date.  Distributions from net investment income and net realized
gains are declared and paid annually.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes due to differences in the  recognition of income and
expense items for financial reporting and tax purposes.

     Supplementary Information-Certain officers and directors of the Corporation
are also officers and/or directors, and, as a group, controlling stockholders of
American Century  Companies,  Inc., the parent of the  Corporation's  investment
manager,  ACIM,  the  Corporation's  distributor,  American  Century  Investment
Services,  Inc. (ACIS), and the Corporation's  transfer agent,  American Century
Services Corporation.

     Use of Estimates-The preparation of financial statements in conformity with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements,  and the reported  amounts of increases  and decreases in net assets
from operations  during the reporting  period.  Actual results could differ from
those estimates.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The  Corporation  has entered  into  Management  Agreements  with ACIM that
provides each Fund with investment  advisory and management services in exchange
for a single,  unified management fee per class. The Agreements provide that all
expenses of the Funds, except brokerage commissions,  taxes, interest,  expenses
of those directors who are not considered "interested persons" as defined in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses, will be paid by ACIM. The fee is computed daily and paid monthly based
on each Fund's average daily closing net assets during the previous month.

     Effective  August 1,  1996,  ACIM has  voluntarily  waived a portion of its
annual  management fee on the Funds. A new  management  agreement,  with fees as
indicated below, is expected to replace the existing  agreement.  Such agreement
is subject to shareholder  approval and will be voted on in July, 1997.  Results
of the vote  were not  available  at the time  this  report  was  printed.  From
December 1, 1996 through May 31, 1997, the management  fees absorbed by ACIM for
International  Growth and International  Discovery were $2,105,848 and $599,815,
respectively.


                                INVESTOR CLASS

                           Management       Effective
                           Agreement        August 1, 1996         ADVISOR CLASS

The annual management fee for each class of International Growth is as follows:

AVERAGE NET ASSETS

First $1 billion ........... 1.90%             1.50%                     1.25%
Of the next $1 billion ..... 1.25%             1.20%                     0.95%
Over $2 billion ............ 1.00%             1.10%                     0.85%


26   Notes to Financial Statements                  American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997 (UNAUDITED)

                                 INVESTOR CLASS

                           Management       Effective
                           Agreement        August 1, 1996

The annual  management fee for the Investor Class of International  Discovery is
as follows:

AVERAGE NET ASSETS
First $500 million ....... 2.00%            1.75%
Of the next
$500 million ............. 2.00%            1.40%
Over $1 billion .......... 2.00%            1.20%


     The Board of Directors has adopted a shareholder  services and distribution
plan for the Advisor Class, pursuant to Rule 12b-1 of the Investment Company Act
of 1940. The Advisor Class Master  Distribution  and  Shareholder  Services Plan
provides that the Funds will pay ACIM an annual  distribution fee equal to 0.25%
and service fee equal to 0.25%.  The fees are  computed  daily and paid  monthly
based on the  Advisor  Class's  average  daily  closing  net  assets  during the
previous month.  The  distribution  fee provides  compensation  for distribution
expenses  incurred in connection with  distributing  shares of the Advisor Class
including,  but not limited to,  payments to  brokers,  dealers,  and  financial
institutions  that have entered into sales agreements with ACIS and/or ACIM. The
service fee provides  compensation for shareholder and  administrative  services
rendered by ACIM,  its  affiliates or independent  third party  providers.  Fees
incurred under the Master Distribution and Shareholder  Services Plan during the
six months ended May 31, 1997, were $11,602 in International Growth.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

     The aggregate cost of investment securities purchased (excluding short-term
investments),  for the period ended May 31, 1997, for  International  Growth and
International Discovery, totaled $1,103,365,987 and $430,103,874,  respectively.
Proceeds from investment securities sold (excluding short-term investments), for
the period  ended May 31,  1997,  for  International  Growth  and  International
Discovery, totaled $977,692,924 and $304,856,061, respectively.

     As  of  May  31,  1997,   accumulated  net  unrealized   appreciation   for
International   Growth  and   International   Discovery  was   $277,026,949  and
$100,846,343,  respectively,  based on the  aggregate  cost of  investments  for
federal income tax purposes of $1,381,885,753  and  $478,824,981,  respectively.
Accumulated   net  unrealized   appreciation   for   International   Growth  and
International Discovery consisted of unrealized appreciation of $289,391,711 and
$107,278,995,  respectively,  and unrealized  depreciation  of  $12,364,762  and
$6,432,652, respectively.



Semiannual Report                          Notes to Financial Statements      27


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997 (UNAUDITED)

4. CAPITAL SHARE TRANSACTIONS

     There  are  400,000,000  and  100,000,000  shares  of  the  Investor  Class
authorized for issuance for International  Growth and  International  Discovery,
respectively,  and  170,000,000  shares  of the  Advisor  Class  authorized  for
issuance for International  Growth.  Sale of the Advisor Class for International
Discovery  had not  commenced as of this report  date.  All shares are $0.01 par
value. Transactions in shares of the Funds were as follows:

<TABLE>
<CAPTION>
                                      INTERNATIONAL GROWTH            INTERNATIONAL DISCOVERY
                                     Shares           Amount         Shares              Amount

INVESTOR CLASS

SIX MONTHS ENDED
MAY 31, 1997:

<S>                                <C>           <C>                 <C>           <C>          
Sold ........................      58,611,504    $ 497,096,995       24,838,625    $ 193,039,930

Issued in reinvestment
of distributions ............      17,809,524      137,887,225        2,369,597       16,757,072

Redeemed ....................     (45,911,881)    (385,655,007)      (6,953,568)     (53,700,237)
                                -------------    -------------    -------------    -------------

Net increase ................      30,509,147    $ 249,329,213       20,254,654    $ 156,096,765
                                =============    =============    =============    =============


Year ended November 30, 1996:

Sold ........................      49,156,430    $ 396,490,732       34,313,861    $ 235,537,402

Issued in reinvestment
of distributions ............         149,517        1,139,329          109,339          639,633

Redeemed ....................     (56,541,549)    (456,529,640)      (4,907,884)     (33,367,338)
                                -------------    -------------    -------------    -------------

Net increase
(decrease) ..................      (7,235,602)   $ (58,899,579)      29,515,316    $ 202,809,697
                                =============    =============    =============    =============


ADVISOR CLASS

SIX MONTHS ENDED MAY 31, 1997:

Sold ........................         384,564       $3,248,954

Issued in reinvestment
of distributions ............          52,435          405,850

Redeemed ....................        (198,330)      (1,678,319)
                                -------------    -------------

Net increase ................         238,669       $1,976,485
                                =============    =============


October 2, 1996(1) through November 30, 1996:

Sold ........................         441,628       $3,713,387

Redeemed ....................          (5,653)         (48,140)
                                -------------    -------------

Net increase ................         435,975       $3,665,247
                                =============    =============

(1) Commencement of sale of the Advisor Class.

</TABLE>


28   Notes to Financial Statements                  American Century Investments

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                              INTERNATIONAL GROWTH


For a Share Outstanding Throughout the Years Ended November 30 (except as noted)


Investor Class

                                           1997(1)      1996          1995        1994       1993    1992

PER-SHARE DATA

Net Asset Value,
<S>                                        <C>          <C>           <C>         <C>        <C>       <C>  
Beginning of Period ...................... $8.73        $7.51         $7.47       $7.34      $5.79     $5.33
                                           --------     --------      --------    --------   -------   -------

Income From
Investment Operations
     Net Investment Income (Loss) ........ 0.02(2)      (0.01)(2)     0.01        (0.04)     (0.04)    0.06
     Net Realized and Unrealized Gain
     on Investment Transactions .......... 1.27         1.24          0.40        0.57       1.78      0.41
                                           --------     --------      --------    --------   -------   -------
     Total From Investment Operations .... 1.29         1.23          0.41        0.53       1.74      0.47
                                           --------     --------      --------    --------   -------   -------

Distributions
     From Net Investment Income .......... -            (0.01)        -           -          (0.04)    (0.01)
     In Excess of Net Investment Income .. -            -             -           -          (0.15)    -
     From Net Realized Gains
     on Investment Transactions .......... (0.92)       -             (0.37)      (0.40)     -         -
                                           --------     --------      --------    --------   -------   -------
     Total Distributions ................. (0.92)       (0.01)        (0.37)      (0.40)     (0.19)    (0.01)
                                           --------     --------      --------    --------   -------   -------
Net Asset Value, End of Period ........... $9.10        $8.73         $7.51       $7.47      $7.34     $5.79
                                           ========     ========      ========    ========   =======   =======
     Total Return(3) ..................... 16.58%       16.35%        5.93%       7.28%      31.04%    8.77%

RATIOS/SUPPLEMENTAL DATA
     Ratio of Operating Expenses
     to Average Net Assets ............... 1.41%(4)(5)   1.65%(5)     1.77%       1.84%      1.90%     1.91%
     Ratio of Net Investment Income
     (Loss) to Average Net Assets ........ 0.59%(4)     (0.07%)       0.25%       (0.53%)    (0.34%)   0.95%
     Portfolio Turnover Rate ............. 71%          158%          169%        242%       255%       180%
     Average Commission Paid per
     Investment Security Traded .......... $0.0305      $0.0195       $0.0020     -(6)       -(6)       -(6)
     Net Assets, End
     of Period (in thousands) ............ $1,678,633  $1,342,608   $1,210,442  $1,316,642  $759,238   $215,346

(1)  Six months ended May 31, 1997 (unaudited).

(2)  Computed using average shares outstanding throughout the period.

(3)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(4)  Annualized.

(5)  American  Century  Investment  Management,  Inc. has  voluntarily  waived a
     portion  of its  management  fee  effective  August 1,  1996  until the new
     management  agreement is approved,  which is expected to be completed  this
     summer.  In absence of the  management  fee waiver,  the ratio of operating
     expenses to average net assets would have been 1.70%  (annualized)  for the
     six months  ended May 31,  1997 and 1.76% for the year ended  November  30,
     1996.

(6)  Disclosure of average  commission  paid per investment  security traded was
     not required prior to the year ended November 30, 1995.
</TABLE>

See Notes to Financial Statements

Semiannual Report                                   Financial Highlights      29

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                              INTERNATIONAL GROWTH

For a Share Outstanding Throughout the Years Ended November 30 (except as noted)

                                                          Advisor Class

                                                     1997(1)           1996(2)

PER-SHARE DATA

<S>                                                  <C>               <C>  
Net Asset Value, Beginning of Period .............   $8.72             $8.41
                                                     ---------         ---------

Income From Investment Operations
     Net Investment Income (Loss)(3) .............   0.02              (0.01)
     Net Realized and Unrealized Gain
     on Investment Transactions ..................   1.27              0.32
                                                     ---------         ---------

     Total From Investment Operations ............   1.29              0.31
                                                     ---------         ---------

Distributions
     From Net Realized Gains
     on Investment Transactions ..................   (0.92)            -
                                                     ---------         ---------

Net Asset Value, End of Period ...................   $9.09             $8.72
                                                     =========         =========
     Total Return(4) .............................   16.56%            3.69%


RATIOS/SUPPLEMENTAL DATA

     Ratio of Operating Expenses
     to Average Net Assets .......................    1.66%(5)         1.67%(5)

     Ratio of Net Investment Income
     (Loss) to Average Net Assets ................    0.34%(5)       (0.76)%(5)

     Portfolio Turnover Rate .....................      71%             158%

     Average Commission Paid per
     Investment Security Traded ..................   $0.0305           $0.0195

     Net Assets, End
     of Period (in thousands) ....................   $6,134            $3,803

(1)  Six months ended May 31, 1997 (unaudited).

(2)  October 2, 1996  (commencement  of sale of Advisor Class) through  November
     30, 1996.

(3)  Computed using average shares outstanding throughout the period.

(4)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(5)  Annualized.
</TABLE>


See Notes to Financial Statements


30   Financial Highlights                           American Century Investments

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                            INTERNATIONAL DISCOVERY


For a Share Outstanding Throughout the Years Ended November 30 (except as noted)


                                                     1997(1)         1996          1995         1994(2)

PER-SHARE DATA

<S>                                                  <C>             <C>           <C>          <C>  
Net Asset Value, Beginning of Period ..............  $7.60           $5.70         $5.39        $5.00
                                                     ----------      ----------    --------     --------

Income From Investment Operations
     Net Investment Income (Loss) .................  0.02(3)         (0.02)(3)     0.03         (0.02)
     Net Realized and Unrealized
     Gain on Investment Transactions ..............  1.07            1.95          0.28         0.41
                                                     ----------      ----------    --------     --------

     Total From Investment Operations .............  1.09            1.93          0.31         0.39
                                                     ----------      ----------    --------     --------


Distributions
     From Net Investment Income ...................  (0.02)          (0.01)        -            -
     In Excess of Net Investment Income ...........  -               (0.02)        -            -
     From Net Realized Gains on
     nvestment Transactions .......................  (0.32)          -             -            -
                                                     ----------      ----------    --------     --------

     Total Distributions ........................... (0.34)          (0.03)        -            -
                                                     ----------      ----------    --------     --------

Net Asset Value, End of Period ..................... $8.35           $7.60         $5.70        $5.39
                                                     ==========      ==========    ========     ========

     Total Return(4) ............................... 15.14%          34.06%        5.75%        7.80%

RATIOS/SUPPLEMENTAL DATA
     Ratio of Operating Expenses
     to Average Net Assets ......................... 1.75%(5)(6)     1.88%(6)      2.00%        2.00%(5)
     Ratio of Net Investment
     Income (Loss) to Average Net Assets ........... 0.43%(5)        (0.31%)       0.27%        (0.48%)(5)
     Portfolio Turnover Rate ....................... 65%             130%          168%         56%
     Average Commission Paid per
     Investment Security Traded .................... $0.0047         $0.0054       $0.0040      -(7)
     Net Assets, End of Period (in thousands) ...... $583,499        $377,128      $114,579     $111,202


(1)  Six months ended May 31, 1997 (unaudited).

(2)  April 1, 1994 (inception) through November 30, 1994.

(3)  Computed using average shares outstanding throughout the period.

(4)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(5)  Annualized.

(6)  American  Century  Investment  Management,  Inc. has  voluntarily  waived a
     portion  of its  management  fee  effective  August 1,  1996  until the new
     management  agreement is approved,  which is expected to be completed  this
     summer.  In absence of the  management  fee waiver,  the ratio of operating
     expenses to average net assets would have been 2.00%  (annualized)  for the
     six months  ended May 31,  1997 and 1.99% for the year ended  November  31,
     1996.

(7)  Disclosure of average  commission  paid per investment  security traded was
     not required prior to the year ended November 30, 1995.
</TABLE>

See Notes to Financial Statements

Semiannual Report                                   Financial Highlights      31

                                     NOTES

32   Notes                                          American Century Investments


                                     NOTES

Semiannual Report                                                    Notes    33


                                     NOTES

34   Notes                                          American Century Investments


                      SHARE CLASSES AND RETIREMENT ACCOUNT
                                  INFORMATION


SHARE CLASSES

     Until September 3, 1996,  International Growth and International  Discovery
issued one class of fund shares,  reflecting the fact that most investors bought
their shares directly from American Century.  All investors paid the same annual
unified management fee and did not pay any commissions or other fees to purchase
shares from American Century.

     But  increasing  numbers of investors are  purchasing  fund shares  through
financial  intermediaries  who are  ordinarily  compensated  for the  additional
services they provide.  In September 1996, American Century began to offer three
classes  of shares  for many of its funds,  including  International  Growth and
International  Discovery. One class is for investors who still buy directly from
American Century, one is for investors who buy through financial intermediaries,
and the third is for large institutional customers.

     The original  class of  International  Growth and  International  Discovery
shares is called the INVESTOR CLASS.  All shares issued and  outstanding  before
September 3, 1996, have been designated as Investor Class shares. Investor Class
shares  may  also  be  purchased  after   September  3,  1996.   Investor  Class
shareholders  do not pay any  commissions  or other  fees for  purchase  of fund
shares directly from American  Century.  Investors who buy Investor Class shares
through a broker-dealer  may be required to pay the  broker-dealer a transaction
fee.  THE PRICE AND  PERFORMANCE  OF THE  INVESTOR  CLASS  SHARES  ARE LISTED IN
NEWSPAPERS. NO OTHER CLASS IS CURRENTLY LISTED.

     In  addition,  there is an  Advisor  Class,  which is sold  through  banks,
broker-dealers, insurance companies and financial advisors. Advisor Class shares
are subject to a 0.50% Rule 12b-1 service and distribution fee. Half of that fee
is available to pay for recordkeeping and administrative  services,  and half is
available  to  pay  for   distribution   services   provided  by  the  financial
intermediary  through  which the Advisor Class shares are  purchased.  The total
expense ratio of the Advisor Class shares is 0.25% higher than the total expense
ratio of the Investor Class shares.

     There is also an INSTITUTIONAL CLASS, which recognizes the relatively lower
cost of  serving  institutional  customers  and  others  who  invest at least $5
million in an American  Century fund or at least $10 million in multiple  funds.
As of May 31,  1997,  International  Discovery  had not sold any  Advisor  Class
shares, and neither fund had sold any Institutional Class shares. All classes of
shares  represent a pro rata interest in the funds and  generally  have the same
rights and preferences.

RETIREMENT ACCOUNT INFORMATION

     As required by law, any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax  withheld.  Your written  notice is valid for six months
from the date of receipt at American Century.  Even if you plan to roll over the
amount you withdraw to another tax-deferred  account, the withholding rate still
applies to the withdrawn  amount unless we have received a written notice not to
withhold federal income tax within six months prior to the withdrawal.

     When you plan to withdraw,  you may make your  election by  completing  our
Exchange/Redemption  form or an IRS Form W-4P. Call American  Century for either
form.  Your  written  election  is valid  for only six  months  from the date of
receipt at American Century. You may revoke your election at any time by sending
a written notice to us.

     Remember, even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


Semiannual Report        Share Classes and Retirement Account Information     35


                             BACKGROUND INFORMATION

INVESTMENT PHILOSOPHY AND POLICIES

     The philosophy behind the Twentieth Century Group's growth funds focuses on
three important principles. Chiefly, the funds seek to own successful companies,
which we define as those whose earnings and revenues are growing at accelerating
rates. In addition,  we attempt to keep the funds fully invested,  regardless of
short-term market activity.  Experience has shown that market gains can occur in
unpredictable  spurts  and that  missing  even some of those  opportunities  may
significantly  limit  potential for gain.  Finally,  American  Century funds are
managed by teams, rather than by one star manager. We believe this enables us to
make better, more consistent management decisions.

     In addition to these principles, each fund has its own investment policies:

     INTERNATIONAL  GROWTH invests primarily in the equity securities of foreign
companies  that exhibit  accelerating  growth.  These  companies will be located
primarily in developed countries. The fund will typically have significant share
price fluctuations.

     INTERNATIONAL  DISCOVERY  invests  primarily  in the equity  securities  of
smaller foreign  companies that exhibit  accelerating  growth. Up to one-half of
these companies can be based in emerging market countries,  with the rest of the
portfolio invested in smaller companies in developed  economies.  The fund holds
the potential  for greater  share price  fluctuation  and  short-term  risk than
International Growth.

HOW CURRENCY RETURNS AFFECT FUND PERFORMANCE

     For U.S. investors, the total return from international stocks includes the
effects of currency fluctuations - the movement of international currency values
in relation to the value of the U.S. dollar.  Currency  exchange rates come into
play when international  stock income,  gains and losses are converted into U.S.
dollars.

     Changing currency values may have a significant impact on the total returns
of  international  stock  funds.  The value of the foreign  investments  held by
international  stock  funds may be reduced or  increased  by changes in currency
exchange rates. The dollar value of a foreign security generally  decreases when
the value of the dollar rises against the foreign currency in which the security
is  denominated.  This  tended to be the case in 1996 and the first  quarter  of
1997, when the dollar increased in value against most major foreign  currencies.
(The weakened foreign currencies bought fewer dollars.)  Conversely,  the dollar
value of a foreign security tends to increase when the value of the dollar falls
against the foreign currency. (The stronger foreign currency buys more dollars.)
In  addition,  the value of fund  assets  may be  affected  by losses  and other
expenses incurred in converting  between various currencies in order to purchase
and sell  foreign  securities  and by currency  restrictions,  exchange  control
regulations, currency devaluations and political developments.

COMPARATIVE INDICES

     The following  indices are used in the report to serve as fund  performance
comparisons. They are not investment products available for purchase.

     The S&P 500 is an index  created by Standard & Poor's  Corporation  that is
considered to represent the performance of the U.S. stock market generally.

     The MORGAN STANLEY EUROPE,  AUSTRALIA, FAR EAST INDEX (EAFE(R)) is a widely
followed group of stocks from 20 different countries.

     LIPPER  INTERNATIONAL  SMALL COMPANY FUNDS measures the average performance
of  International  Discovery's  peer group,  as defined  and  compiled by Lipper
Analytical Services, Inc. Lipper is an independent mutual fund ranking service.



FUND MANAGEMENT TEAM LEADERS
Portfolio Manager   Henrik Strabo
Portfolio Manager   Mark Kopinski

36   Background Information                         American Century Investments



                                    GLOSSARY

RETURNS

o TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

o AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations in a fund's return;  they are not the same as  year-by-year  results.
For fiscal year-by-year total returns,  please refer to the Financial Highlights
on pages 30 and 31.


PORTFOLIO STATISTICS

o EXPENSE RATIO- the operating  expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

o PORTFOLIO  TURNOVER- the percentage of a fund's  investment  portfolio that is
replaced during a given time period, usually a year. Actively managed portfolios
tend to have higher  turnover than passively  managed  portfolios  such as index
funds.


Semiannual Report                                                    Glossary 37



[american century logo]
American
Century(sm)

P.O. Box 419200
Kansas City, Missouri
64141-6200

Person-to-Person Assistance:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-444-3485

Fax: 816-340-7962

Internet: www.americancentury.com


AMERICAN CENTURY WORLD MUTUAL FUNDS, INC.

Investment Manager
American Century Investment Management, Inc.
Kansas City, Missouri

This report and the financial  statements contained herein are submitted for the
general  information  of our  shareholders.  The  report is not  authorized  for
distribution  to  prospective  investors  unless  preceded or  accompanied by an
effective prospectus.

American Century Investment Services, Inc.


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