AMERICAN CENTURY WORLD MUTUAL FUNDS INC
N-30D, 1998-07-30
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[front cover]
                                                                    MAY 31, 1998

SEMIANNUAL REPORT
- -----------------
AMERICAN CENTURY


   [graphic of globe, U.S. Currency, and money managers overlooking monitors]


TWENTIETH CENTURY GROUP
- -----------------------
INTERNATIONAL GROWTH
INTERNATIONAL DISCOVERY
EMERGING MARKETS

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                 Century(reg.tm)
[inside front cover]


A Note from the Founder
- --------------------------------------------------------------------------------

     On our 40th  anniversary,  I would  personally  like to express my profound
appreciation  for the  confidence  you have shown in  American  Century.  We are
grateful for the opportunity to manage your money,  and we will do our utmost to
continue to meet your expectations and justify your confidence in us.

     I  founded  American  Century  on  the  belief  that  if we  can  make  you
successful,  you, in turn,  will make us successful.  That is the principle that
will guide us in the future.

     Sincerely,
     /s/James E. Stowers


About our New Report Design
- --------------------------------------------------------------------------------

WHY WE CHANGED

We're trying hard to be reader-friendly.  Our reports contain a lot of very good
information, from fund statistics and financials to Q&A's with fund managers. We
hope the new design will make the reports more  interesting  and  understandable
while helping you to keep abreast of your fund's strategy and performance.

WHAT'S NEW

The reports are designed to be attractive and easy to use whether you're reading
them in depth or just skimming.

     New features include:

* Larger type size in many sections.
* Brief explanations of the financial statements.
* More prominent graphs and charts.
* Quotes in the margins to highlight report content.

THE BOTTOM LINE

The new design  actually  costs  slightly less than the old one. We  reallocated
costs and eliminated a cover letter and the envelope that  previously  came with
your  report  enclosed.  This not only  saves  money but  reduces  the number of
mailing pieces you receive.

The new  reports  also use  roughly  the same  amount  of paper as the old ones.
Previously,  paper was trimmed  and thrown  away to produce  the smaller  report
size.

We believe we've come up with a more interesting,  informative and user-friendly
publication.

We hope you enjoy it.


[left margin]

TWENTIETH CENTURY GROUP
INTERNATIONAL GROWTH
(TWIEX)

TWENTIETH CENTURY GROUP
INTERNATIONAL DISCOVERY
(TWEGX)

TWENTIETH CENTURY GROUP
EMERGING MARKETS
(TWMIX)

[40 Years logo]
Four Decades of Serving Investors
American Century
1958-1998

On the Cover:

Kevin  Lewis and  Cindy  Miller  are part of the  investment  group at  American
Century.


Our Message to You
- --------------------------------------------------------------------------------

[photo of James E. Stowers, Jr. with James E. Stowers III, seated]
James E. Stowers, Jr. with James E. Stowers III, seated

     When we launched our first  international  fund in 1991, our purpose was to
provide meaningful  diversification for investors in markets outside the U.S. We
also believed many  internationally-based  companies were attractive investments
in  their  own  right,  and we were  convinced  our  proprietary  discipline  of
purchasing  individual  businesses with accelerating revenues and earnings would
prove effective abroad. Over the years, this strategy has been successful.

     Foreign markets produced widely diverse returns during the six months ended
May 31. The Far East and many  emerging  markets  finished  the  period  sharply
lower,  while Europe saw stock prices surge. Our international  investment group
continued  to  find  exciting   companies   worldwide.   Although  the  historic
transformation  of  Europe's  economic  structure  continued  to  generate  many
compelling  ideas,  our investment  team  discovered  earnings  acceleration  in
locations as diverse as Greece and India.

     Our  international  investment  team now  stands  at 11.  Collectively  its
members speak 11 languages and visited 21 countries over the past six months.

     International  Growth,  International  Discovery  and Emerging  Markets all
outperformed  their  benchmark  indices during the period.  While  International
Growth  and  International   Discovery  generated  substantial  gains,  we  were
especially  encouraged by the performance of Emerging Markets,  which managed to
post positive returns despite serious crises in many developing economies.

     On the corporate front, the past six months have been eventful for American
Century.  As many of you may know,  we gained a  powerful  business  partner  in
January,  when  J.P.  Morgan,  one of the  oldest,  largest  and most  respected
financial  service  institutions  in the world,  became a  substantial  minority
shareholder.  The new business  partnership  will allow both  companies to offer
investors a broader menu of investment options and services.

     We also  hope  you like the new  design  of this  report.  Our  annual  and
semiannual  reports  contain a wealth of information  about fund  strategies and
holdings.  The new design is intended to make this  information  more accessible
and to encourage you to take a closer look.

     In 1998, we will mark our 40th  anniversary.  Few fund  companies have been
around  that long and can offer the wide array of funds or the fine  performance
and service we do at American Century.

     We appreciate your investment with us.

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


[right margin]

                           Table of Contents

   Report Highlights .......................................................   2

   Market Perspective ......................................................   3

INTERNATIONAL GROWTH

   Performance Information .................................................   5

   Management Q&A ..........................................................   6

   Schedule of Investments .................................................   9

   Financial Highlights ....................................................  38

INTERNATIONAL DISCOVERY

   Performance Information .................................................  13

   Management Q&A ..........................................................  14

   Schedule of Investments .................................................  17

   Financial Highlights ....................................................  41

EMERGING MARKETS

   Performance Information .................................................  22

   Management Q&A ..........................................................  23

   Schedule of Investments .................................................  26

   Financial Highlights ....................................................  44

FINANCIAL STATEMENTS

   Statements of Assets and
   Liabilities .............................................................  30

   Statements of Operations ................................................  31

   Statements of Changes
   in Net Assets ...........................................................  32

   Notes to Financial
   Statements ..............................................................  33

OTHER INFORMATION

   Share Class and Retirement
   Account Information .....................................................  45

   Background Information

      Investment Philosophy and
      Policies .............................................................  46

      How Currency Returns Affect
      Fund Performance .....................................................  46

      Comparative Indices ..................................................  46

      Portfolio Managers ...................................................  46

   Glossary ................................................................  47


                                           www.americancentury.com        1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*    Performance  in foreign  markets  varied  widely,  with  developed  markets
     generating  strong gains and emerging  markets  losing  ground.  The Morgan
     Stanley  Capital  International  EAFE Index  gained  16.06%  during the six
     months ended May 31. The Morgan  Stanley  Emerging  Markets Free Index lost
     7.17%.

*    Some of the  world's  healthiest  growth  rates  are in  Europe,  fueling a
     powerful bull market.  The anticipated  introduction of a unified  European
     currency  is driving  business  and  government  efforts  to make  European
     investments more attractive.

*    Japan is now  officially  in  recession  and the Far  East is  experiencing
     contractions in manufacturing output and consumer spending.

INTERNATIONAL GROWTH

*    International  Growth's  Investor Class shares  returned 28.60% for the six
     months ended May 31, 1998, compared to 16.06% for the fund's benchmark, the
     Morgan Stanley Capital International EAFE Index. (See total returns on page
     5.)

*    The  fund's  greater  exposure  to  European  businesses  and  its  lighter
     weighting  in  Asia,  relative  to  the  benchmark,  explains  much  of the
     difference in performance.

*    Banking,   financial   services,   computer   software   and  services  and
     communications  equipment companies were among the fund's top contributors.
     They are benefiting from major changes in European economies.

*    The most significant  change in the portfolio was an increased  exposure to
     cellular and  telecommunications  companies,  which are experiencing  rapid
     subscriber expansion.

INTERNATIONAL DISCOVERY

*    International  Discovery's Investor Class shares posted a 33.92% return for
     the six months ended May 31, 1998, or more than twice the benchmark index's
     gain. (See totals returns on page 13.)

*    The  fund's  greater  exposure  to  European  businesses  and  its  lighter
     weighting  in  Asia,  relative  to  the  benchmark,  explains  much  of the
     difference in performance.

*    Companies  that provide  financial  services,  information  technology  and
     temporary  employment were among the fastest growers in Europe.  The fund's
     large exposure to these companies generated healthy returns.

*    Changes to the portfolio have been few, due to our continued  belief in the
     sustainability of earnings growth among our European holdings.

EMERGING MARKETS

*    Emerging  Markets  returned  2.41% for the six months  ended May 31,  1998,
     compared  to a  decline  of 7.17% for its  benchmark,  the  Morgan  Stanley
     Emerging Markets Free Index.  (See total returns on page 22.) Many emerging
     markets continued to suffer the effects of the economic and currency crises
     that rocked Southeast Asia in late 1997.

*    The fund's stronger performance, relative to the index, is explained by its
     lower exposure to countries that are heavily represented in the index.

*    We have found the strongest earnings growth in software  services,  banking
     and cellular service companies. Companies in the oil services and utilities
     industries were among the weaker performers.

*    Changes to the portfolio include increased  investments in  export-oriented
     software and  financial  services  companies  that have shown  accelerating
     earnings growth.


[left margin]

         INTERNATIONAL GROWTH (TWIEX) (1)

TOTAL RETURNS:                    AS OF 5/31/98

    6 Months                          28.60%(2)
    1 Year                               30.30%

NET ASSETS:                        $2.4 billion

INCEPTION DATE:                          5/9/91


        INTERNATIONAL DISCOVERY (TWEGX) (1)

TOTAL RETURNS:                      AS OF 5/31/98

    6 Months                           33.92%(2)
    1 Year                               36.97%

NET ASSETS:                      $848.6 million

INCEPTION DATE:                          4/1/94


           EMERGING MARKETS (TWMIX)

TOTAL RETURNS:                     AS OF 5/31/98

    6 Months                             2.41%(2)
    Since Inception                       -15.00%

NET ASSETS:                           $22 million

INCEPTION DATE:                           9/30/97

(1)       Investor Class.
(2)       Not annualized.

Investment terms are defined in the Glossary on page 47.


2    1-800-345-2021


Market Perspective from Bob Puff
- --------------------------------------------------------------------------------

[photo of Bob Puff, chief investment officer of American Century Investments]
Bob Puff, chief investment officer of American Century Investments

DIVERSITY IS STILL THE RULE

     The behavior of  international  equity  markets during the six months ended
May 31  demonstrates  not only the  extent of the  decoupling  of  domestic  and
foreign  markets,  but also the difference in performance  among foreign markets
themselves.  It shows as well that it is possible to produce positive investment
results even in a turbulent global economic environment.

     During the six months, the Morgan Stanley Capital  International EAFE Index
gained 16.06%,  while the Morgan Stanley Emerging Markets Free Index lost 7.17%.
EAFE benefited from an impressive  performance by mature European  markets.  The
much  publicized  crisis in Southeast  Asia,  which  migrated to the  developing
economies  of  Eastern  Europe and Latin  America,  accounted  for the  Emerging
Markets Free Index's weak performance.

     The chart on this page points out the  difference  among returns in Europe,
the U.S., and the Far East over the same six months.

A BRIEF LOOK BACK

     In the late 1980s, the prevailing wisdom was that all international markets
carried more risk than domestic equities.  International  investment was seen as
risky for several reasons:

*    Foreign currencies were volatile.

*    The  availability  of accurate  and useful  information  on  non-U.S.-based
     companies was extremely limited.

*    Accounting standards around the globe were not comparable to U.S. standards
     or were often not understandable to investors in other parts of the world.

*    There were  legitimate  questions about  regulatory  issues and whether the
     proper  disclosure  was  available  --something  U.S.  investors  take  for
     granted.

*    U.S. regulators encouraged mutual fund companies to put international funds
     on the aggressive end of the risk spectrum.

*    Finally,  foreign  investments  were thought to hold  additional  political
     risks, especially in developing countries.

     Ten years  later  these  issues are still with us, but the  emergence  of a
global  economy and the desire of countries to  participate in the post-Cold War
economic  boom have brought  about  significant  improvements.  In a world where
Coca-Cola  derives  most of its profits  from  foreign  customers  and  European
companies like pharmaceutical  giant Novartis advertise regularly in the U.S., a
lot is riding on global interdependence.

     But  foreign  companies  are not just  coming  to the U.S.  to tap into our
powerful  consumer  base.  They are also  looking  for  capital  to build  their
businesses.  To obtain that capital they are increasingly  being asked to reform
and clarify their accounting standards.


[right margin]

MARKET RETURNS
FOR THE SIX MONTHS ENDED MAY 31, 1998

MSCI EUROPE                          29.69%
MSCI FAR EAST                       -11.03%
S&P 500                              15.03%
Source: Lipper Analytical Services, Inc.


"Foreign companies are not just coming to the U.S. to tap into our powerful
consumer base. They are also looking for capital to build their businesses."


[line chart - data below]

MARKET PERFORMANCE (GROWTH OF $1.00)
FOR THE SIX MONTHS ENDED MAY 31, 1998

                      MSCI          MSCI           S&P
                     EUROPE       FAR EAST         500
                    $1.00000      $1.00000      $1.00000
11/30-12/31         $1.03650      $0.94980      $1.01990
12/31-1/31          $1.07962      $1.00090      $1.03030
1/31-2/28           $1.16404      $1.03863      $1.10284
2/28-3/31           $1.24692      $0.97569      $1.16195
3/31-4/30           $1.27111      $0.95569      $1.17252
4/30-5/31           $1.29692      $0.88975      $1.15036


                                               www.americancentury.com    3


Market Perspective (continued)
- --------------------------------------------------------------------------------

     The search for capital and the growing  professionalism  in the  investment
management  business  around the world are also prompting  corporations to raise
their standards for the release of pertinent, shareholder-relevant information.

     Countries are being asked to put in place policies that will help stabilize
their economies and currencies and encourage foreign investment.

     These trends are by no means  uniform  around the globe,  but they are more
widely in evidence, especially in Europe.

EUROPE AT THE THRESHOLD

     There has been a powerful  bull market in Europe for several  years now, as
the  Continent  prepares for the onset of the European  Monetary  Union (EMU) in
1999. Supporting the European equity rally was a substantial decline in interest
rates.  On the  corporate  front,  Europe  has made great  progress.  Accounting
standards are improving. Companies are consolidating to meet global competition,
buying  back  their  own  stock,  and  tying  management  compensation  to stock
performance,   which  tends  to  align  management's  interests  with  those  of
shareholders.   European   governments   continue  to  privatize--to   sell  off
corporations  they once controlled to the private sector.  Although tax rates in
Europe remain high,  they could decline after the EMU is in place.  This,  along
with more equity-oriented savings and retirement  practices--similar to those we
have seen in the U.S. during the last decade--should encourage investment.

THE ASIAN RECESSION

     Recent events in Asia have taken a serious turn. Japan is now officially in
recession,  and there have been major  contractions in manufacturing  output and
consumer spending  throughout the Far East. Whereas mergers and market expansion
are  the  rule  in  Europe,  companies  in  Asia  are  often  merging  to  avoid
liquidation.  The region remains awash in bad loans and overbuilt  manufacturing
capacity.  Credit  is  now  extremely  tight--after  years  of  being  abundant.
Political  confrontation is also a concern.  Many of the changes that could pull
Asia out of its current crisis are cultural,  as opposed to simply economic,  so
reforms may take longer to effect.

RISK AND FOREIGN INVESTING

     The  contrast  between the  ongoing  Asian  economic  crisis and the strong
markets of Europe  suggests that major global economic events in one part of the
world do not always have significant impact on other foreign markets.  No one is
downplaying the seriousness of what has happened in Asia and the recent economic
and  political  events  in  Russia.  But  unless  these  events  unfold  into  a
full-scale,  global recession,  which does not seem likely given the good health
of the U.S. and European  economies,  many foreign  markets  should  continue to
provide a source of both positive  investment  returns and  diversification  for
U.S.-based investors.


[left margin]

"There has been a powerful  bull market in Europe for several  years now, as the
Continent prepares for the onset of the European Monetary Union (EMU) in 1999.

"Recent  events in Asia have taken a serious  turn.  Japan is now  officially in
recession,  and there have been major  contractions in manufacturing  output and
consumer spending throughout the Far East."


4    1-800-345-2021


<TABLE>
International Growth--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF MAY 31, 1998

                           INVESTOR CLASS                  ADVISOR CLASS               INSTITUTIONAL CLASS
                         (INCEPTION 5/9/91)             (INCEPTION 10/2/96)            (INCEPTION 11/20/97)

                    INTERNATIONAL      MSCI          INTERNATIONAL      MSCI        INTERNATIONAL     MSCI
                       GROWTH      EAFE(reg.tm)         GROWTH      EAFE(reg.tm)       GROWTH
EAFE(reg.tm)

<S>                   <C>            <C>               <C>            <C>             <C>           <C>   
6 MONTHS(1) .........  28.60%         16.06%            28.44%         16.06%          28.75%        16.06%

1 YEAR ..............  30.30%         11.11%            29.99%         11.11%            --            --
- -------------------------------------------------------------------------------------------------------------------------------

AVERAGE ANNUAL RETURNS

3 YEARS .............  23.53%          9.76%               --             --              --           --

5 YEARS .............  17.57%          9.52%               --             --              --           --

LIFE OF FUND ........  16.81%       8.52%(2)             31.39%        12.32%(3)        28.19%      16.06%(4)
</TABLE>

(1)  Returns for periods less than one year are not annualized.

(2)  Return from 5/31/91, the nearest date for which data are available.

(3)  Return from 10/31/96, the nearest date for which data are available.

(4)  Return from 11/30/97, the nearest date for which data are available.

See pages 45, 46 and 47 for information  about share classes,  MSCI EAFE(reg.tm)
and returns.


These  charts are based on Investor  Class shares  only;  performance  for other
classes will vary due to differences  in fee  structures  (see the Total Returns
table above).  The chart at left shows the growth of a $10,000 investment in the
fund since the end of the month after inception, while the chart below shows the
fund's  year-by-year   performance.   The  MSCI  EAFE(reg.tm)  is  provided  for
comparison in each chart.  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. International Growth's total returns include
operating  expenses (such as transaction  costs and management fees) that reduce
returns, while the total returns of the MSCI EAFE(reg.tm) do not.


[mountain chart - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
VALUE ON 5/31/98
International Growth       $29,345
MSCI EAFE                  $17,724
               INTERNATIONAL GROWTH           MSCI EAFE INDEX
DATE               ACCT VALUE                    ACCT VALUE
5/31/91             $10,000                        $10,000
6/30/91              $9,596                        $9,265
9/30/91             $10,231                       $10,060
12/31/91            $10,802                       $10,228
3/31/92             $11,418                        $9,014
6/30/92             $12,112                        $9,205
9/30/92             $11,611                        $9,344
12/31/92            $11,325                        $8,983
3/31/93             $12,301                       $10,060
6/30/93             $12,818                       $11,072
9/30/93             $13,654                       $11,806
12/31/93            $16,155                       $11,908
3/31/94             $15,568                       $12,324
6/30/94             $15,778                       $12,954
9/30/94             $16,344                       $12,967
12/31/94            $15,387                       $12,834
3/31/95             $14,879                       $13,073
6/30/95             $15,741                       $13,168
9/30/95             $16,581                       $13,717
12/31/95            $17,216                       $14,273
3/31/96             $17,614                       $14,685
6/30/96             $18,455                       $14,917
9/30/96             $18,500                       $14,899
12/31/96            $19,700                       $15,136
3/31/97             $20,789                       $14,899
6/30/97             $23,610                       $16,832
9/30/97             $24,501                       $16,714
11/30/97            $22,819                       $15,272
12/31/97            $23,585                       $15,405
3/31/98             $27,819                       $17,671
5/31/98             $29,345                       $17,724


[bar chart - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDING MAY 31)
                 INTERNATIONAL GROWTH      MSCI EAFE (reg. tm)
5/31/92                 23.43%                  -3.37%
5/31/93                  5.79%                  16.40%
5/31/94                 22.72%                  13.57%
5/31/95                 -2.89%                   4.93%
5/31/96                 17.13%                  10.67%
5/31/97                 23.36%                   7.54%
5/31/98                 30.30%                  11.11%


                             www.americancentury.com
5


International Growth--Q&A
- --------------------------------------------------------------------------------

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

INTERNATIONAL  GROWTH  AGAIN  HAS  PERFORMED  VERY  WELL AND HAS BEEN ONE OF THE
BETTER PERFORMING  INTERNATIONAL  FUNDS FOR THE LAST TWO YEARS. WOULD YOU PLEASE
DISCUSS SOME OF THE REASONS FOR THESE RETURNS?

     While we do not  invest  the  portfolio  against a  specific  index,  we're
gratified that our investment approach again allowed us to outperform the Morgan
Stanley  Capital  International  EAFE Index for the six months from November 30,
1997, through May 31, 1998.  International  Growth returned 28.60% compared with
EAFE's  16.06%.*  During the 12 months ended May 31,  International  Growth rose
30.30% while the EAFE index returned 11.11%. For the three-year period ended May
31, International Growth had an average annual return of 23.53% versus 9.76% for
EAFE.

     Relative  to EAFE,  International  Growth had a much  greater  exposure  to
businesses in Europe and a lighter  weighting in Asia, and that largely explains
the wide performance gap between the fund and its benchmark.

     International  Growth  also did far better  than most  foreign  stock funds
during  the  six  months.   According  to  Lipper  Analytical  Services,   Inc.,
International  Growth finished in the top 4% of 474 international  funds for the
12 months  ended May 31. It also beat out its  international  fund peers for the
three-year period, finishing in the top 2% of 287 funds, according to Lipper.(+)
In addition,  the fund was awarded five stars by Morningstar  for the three- and
five-year periods ending May 31, 1998, out of 764 and 330  international  equity
funds,  respectively.(+)(+)  Both Morningstar and Lipper are independent  mutual
fund rating companies.

     We believe our success in the current uncertain global economic environment
is  attributable  to our methodology of focusing on companies whose earnings are
growing at an accelerating rate. As we discussed in the annual report six months
ago, this approach pointed us toward certain  fast-growing  European  businesses
and away from slower-growing companies in Asia and Japan.

     Although  we are  currently  heavily  invested  in Europe,  our  investment
strategy is not  dictated by factors such as country or sector  weightings.  The
investment team continually monitors such macro factors as a country's political
and  economic  stability,  but our  primary  strategy is to own  companies  with
accelerating revenues and earnings regardless of where they are located.

WHAT WERE SOME OF THE HOLDINGS THAT CONTRIBUTED MOST SIGNIFICANTLY TO RETURNS?

     Accelerating  earnings growth is evident in banking and financial services,
computer software and services, and communications  equipment companies,  all of
which were among the



* All fund returns referenced are for Investor Class shares.

(+) Lipper  rankings  are based on average  annual total  returns.  The fund was
 ranked in the top 6% for the five-year period out of 130 funds.

(+)(+) Morningstar  proprietary ratings reflect risk-adjusted  performance as of
 May 31, 1998. The overall rating,  which may change monthly, is calculated from
 the fund's 3- and 5-year  average  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.  Ten percent of the funds
 in an investment category receive five stars and 22.5% receive four stars. Past
 performance is no guarantee of future results.


[left margin]

PORTFOLIO AT A GLANCE
                                      5/31/98          11/30/97

NO. OF COMPANIES                       123               122

MEDIAN MARKET                         $6.7              $5.4
CAPITALIZATION                       BILLION           BILLION

PORTFOLIO TURNOVER                   94%(1)            163%(2)

EXPENSE RATIO (FOR
INVESTOR CLASS)                      1.35(3)            1.38%

"Our primary strategy is to own companies with accelerating  revenues and
earnings regardless of where they are located."

(1)       Six months ended 5/31/98.
(2)       Year ended 11/30/97.
(3)       Annualized.

Investment terms are defined in the Glossary on page 47.


6   1-800-345-2021


International Growth--Q&A (continued)
- --------------------------------------------------------------------------------

best-performing  industry groups in the portfolio.  Many of the companies are in
Europe,  where  rapidly  developing  economic   crosscurrents  are  transforming
industry. The introduction of a single currency in 1999, corporate restructuring
and privatization,  labor and pension reform, and corporate management's renewed
focus on the bottom line are some of the forces at work there.

     Mannesmann AG, a German information technology and engineering firm, is one
of the leading providers of cellular telephone service in Germany. As one of the
largest  holdings  in  the  portfolio,   Mannesmann  represents  about  2.6%  of
investments  and  was  one  of our  best-performing  stocks.  The  extraordinary
popularity  of  cellular  service  across  the  European  continent  is  largely
responsible for Mannesmann's  performance.  Many investors  started to pull back
from some of the cellular service providers early this year, feeling that market
penetration  could not expand much more.  But cellular  subscriptions  in Europe
continue to grow at a surprising  rate. This expansion in the cellular  business
has helped Mannesmann's earnings growth.

     While several new telecom ventures were started in Europe in the last year,
Mannesmann's  established  mobile  facility  service  in  Germany,  and  smaller
operations  in  France  and  Italy,  position  the  company  to  become  a major
competitor  in the  expanding  European  communications  business.  In addition,
Mannesmann's once unprofitable engineering division has started to contribute to
earnings.  Other strong  contributors from the  telecommunications  and cellular
group include Alcatel Alsthom, Nokia and Ericsson Telephone.

     Referring to the chart on the right,  you will see that financial  services
was  the  largest  industry  holding  in  the  portfolio  at  just  over  12% of
investments.  It was also one of the best-performing  groups.  Europe's changing
attitude toward the investment of personal savings means financial  institutions
are  well-positioned  to take  advantage of the growing  interest in  retirement
planning.   Financial  service   institutions  are  starting  to  offer  updated
investment  products as individuals  seek to shift out of  traditional  types of
investments, such as bank savings accounts, and into mutual funds.

     Some of the  top-performing  financial services names in the portfolio were
ING Groep N.V., Julius Baer Holding AG, Banca Intesa SPA and AMVESCAP.

     Pension  modernization is also stimulating  demand for mutual funds,  which
have been largely unavailable until recently.  As a result, the asset management
business in Europe is starting to see significant inflows, similar to the United
States in the early  1980s.  Julius  Baer  Holding AG, a Swiss  private  banking
concern with a substantial global asset management capability,  represented more
than 2% of the  portfolio  at the end of the  period.  It also was among our top
performers.  Banca Intesa SPA is one of the largest asset  managers in Italy,  a
country  where cash flows into  mutual  funds have been very  strong.  AMVESCAP,
another major asset manager,  has a global reach,  having recently  acquired LGT
Asset Management and AIM Management Group in 1997.

     The European  mutual fund business has the potential to experience  similar
levels of growth to those seen in the U.S. fund business over the past 20 years.

WERE THERE ANY STOCKS THAT DIDN'T DO AS WELL AS YOU HAD EXPECTED?

     Problems in the Asian economies and the worldwide decline in the price


[right margin]

TOP TEN HOLDINGS
                               % OF FUND INVESTMENTS
                             AS OF               AS OF
                            5/31/98            11/30/97

ING GROEP N.V.                2.9%               2.1%
MANNESMANN AG                 2.6%               1.1%
MISYS PLC                     2.3%               1.8%
JULIUS BAER
     HOLDING AG               2.1%               1.3%
AXA-UAP                       2.0%               1.7%
CAP GEMINI SA                 1.7%               1.1%
NESTLE S.A.                   1.7%               1.5%
CREDIT SUISSE GROUP           1.6%               1.7%
ALCATEL ALSTHOM
     COMPAGNIE GENERALE       1.6%               0.5%
TELEFONICA DE ESPANA          1.6%                --



TOP FIVE INDUSTRIES
                                % OF FUND INVESTMENTS
                             AS OF                AS OF
                            5/31/98             11/30/97

FINANCIAL SERVICES           12.1%               12.6%
COMPUTER SOFTWARE
     & SERVICES              10.2%                7.8%
BANKING                       9.8%               12.2%
COMMUNICATIONS
     SERVICES                 8.5%                2.9%
INSURANCE                     4.9%                4.1%


                                             www.americancentury.com   7


International Growth--Q&A (continued)
- --------------------------------------------------------------------------------

of oil hurt the energy  exploration  and production  companies in the portfolio.
Other commodity-based companies,  including chemicals, did not do well. The drop
in oil  prices  and the  fall-off  in demand  hurt  several  energy  exploration
companies, including British-Borneo Petroleum,  Transocean Offshore and Woodside
Petroleum LTD.

     Takeda  Chemical  also was down due to a decline in  earnings  growth.  The
stock had performed well but the fall in earnings, due to a restructuring in the
government-controlled  pharmaceutical  pricing structure,  resulted in a drop in
its stock price.

DID YOU  MAKE ANY  SIGNIFICANT  CHANGES  TO THE  PORTFOLIO  DURING  THE LAST SIX
MONTHS?

     As  mentioned  earlier,  we  made a  significant  move  into  cellular  and
telecommunications   companies.  After  reducing  holdings  in  Nokia,  Phillips
Electronics,  Ericsson and Alcatel at the onset of the Asian economic  crisis in
mid-1997,  we moved back into these  names  this year.  Cellular  infrastructure
order  growth  continued  to expand  and  demand for  cellular  services  at the
consumer level remained high. Moreover, our analysis indicated earnings remained
on the upswing.  We were able to build  positions  in these growth  companies at
lower prices and then saw them move beyond their 1997 highs.

     We  also  reduced  holdings  in  Novartis  AG to  less  than  2%  of  total
investments from nearly 5% six months ago, as earnings had begun to slow.

THE ASIAN ECONOMIC CRISIS IS THE DOMINANT FACTOR IN THE INTERNATIONAL INVESTMENT
PICTURE. DO YOU EXPECT TO MAKE ANY PORTFOLIO ADJUSTMENTS TO ACCOUNT FOR THIS?

     The portfolio's  exposure to Asian companies had already been cut back last
year and was reduced further during the period.

     As mentioned earlier,  our bottom-up earnings growth investment process has
led us to focus primarily on European  companies  while Asian  companies  suffer
from  continuing  economic   deterioration.   Business  fundamentals  have  been
improving  in  Europe,  economies  are  accelerating  and  earnings  and  profit
surprises  are largely on the  positive  side.  Almost  exactly the  opposite is
generally the case in Asia right now.

     The fact that we, and many others,  are not currently  investing heavily in
Asian and Pacific Rim  markets  doesn't  mean we aren't  looking  there.  We are
continuing to evaluate Asian companies and companies that export to Asia, and we
expect to be there  when the  earnings  picture  begins to change or a  positive
catalyst emerges to brighten the earnings outlook.


[pie charts]

TYPES OF INVESTMENTS IN  THE PORTFOLIO

AS OF MAY 31, 1998
Preferred Stocks           1.9%
Repurchase Agreements      3.8%
Common Stocks & Rights    94.3%

AS OF NOVEMBER 30, 1997
Repurchase Agreements      1.3%
Preferred Stocks           3.7%
Common Stocks & Rights    95.0%


[bar chart]
INTERNATIONAL GROWTH'S INVESTMENTS BY COUNTRY
                 5/31/98                 11/30/97
France            14.3%                    9.9%
U.K.              13.7%                   19.1%
Germany           12.4%                    9.2%
Netherlands        9.8%                   10.3%
Switzerland        8.9%                   12.7%
Canada             6.3%                    6.7%
Sweden             4.9%                    3.8%
Japan              4.6%                    9.5%
Other             25.1%                   18.8%


8    1-800-345-2021


International Growth--Schedule of Investments
- -------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

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

COMMON STOCKS & RIGHTS

BELGIUM--1.2%

        280,000  Lernout & Hauspie
                    Speech Products N.V.(1)                 $  15,032,500
                   (computer software & services)

          3,150  UCB SA                                        14,971,491
                   (pharmaceuticals)                 -------------------------

                                                               30,003,991
                                                     -------------------------

CANADA--6.3%

        336,000  BCE Inc.                                      15,539,639
                   (communications services)

        686,000  Bombardier Inc. Cl B                          17,641,682
                   (aerospace & defense)

        236,000  Canadian National Railway Company             13,969,579
                   (railroad)

        513,000  Geac Computer Corp. Ltd.(1)                   18,758,627
                   (computer software & services)

        497,700  Investor's Group, Inc.                        18,147,894
                   (financial services)

        148,000  Magna International Inc. Cl A                 10,407,004
                   (automobiles & auto parts)

        637,010  Newcourt Credit Group Inc.
                   (Acquired 9/8/97--2/6/98,
                    Cost $21,884,242)(2)                       31,276,371
                   (financial services)

        258,100  Northern Telecom Ltd.                         16,536,124
                   (communications equipment)

        257,000  Teleglobe Inc.                                13,333,116
                   (communications services)         -------------------------

                                                              155,610,036
                                                     -------------------------

DENMARK--2.3%

        208,000  Novo Nordisk A/S Cl B                         32,729,893
                   (pharmaceuticals)

        262,700  Tele Danmark A/S Cl B                         24,570,538
                   (communications services)         -------------------------

                                                               57,300,431
 .                                                    -------------------------

FINLAND--3.4%

      2,976,400  Merita OY Ltd. Cl A                           18,706,731
                   (banking)

        414,000  Nokia Corp. Cl A ADR                          26,884,125
                   (communications equipment)

         72,400  Raisio Group plc                              13,544,308
                   (food & beverage)

        542,100  Sampo Insurance Company Ltd.                  25,178,635
                   (insurance)                       -------------------------

                                                               84,313,799
                                                     -------------------------

FRANCE--14.3%

        116,000  Accor SA                                      31,800,200
                   (leisure)

        185,675  Alcatel Alsthom
                   Compagnie Generale                          39,703,308
                   (communications services)

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

         54,069  Altran Technologies SA                     $  11,064,906
                   (business services & supplies)

        438,841  Axa--UAP                                      49,924,945
                   (insurance)

        169,000  Banque Nationale de Paris                     14,426,829
                   (banking)

        276,711  Cap Gemini SA                                 41,280,141
                   (computer software & services)

        123,000  Groupe Danone                                 33,102,740
                   (food & beverage)

        276,000  Lafarge SA                                    27,987,304
                   (construction & property
                   development)

         38,000  Pinault--Printemps--Redoute SA                31,264,617
                   (retail--general merchandise)

        124,100  Societe Generale Cl A                         24,567,073
                   (banking)

        107,000  Societe Television Francaise 1                15,086,535
                   (broadcasting & media)

        154,700  Vivendi                                       31,064,049
                   (utilities)                       -------------------------

                                                              351,272,647
                                                     -------------------------

GERMANY--10.7%

         70,676  Allianz AG(1)                                 22,326,546
                   (insurance)

         23,134  Bayerische Motoren Werke
                   (BMW) AG(1)                                 24,419,231
                   (automobiles & auto parts)

        278,000  Daimler--Benz AG                              28,002,465
                   (automobiles & auto parts)

         82,000  Deutsche Bank AG                               7,056,134
                   (financial services)

        445,600  Deutsche Pfandbrief-und
                   Hypothekenbank AG                           35,648,000
                   (banking)

        248,000  Douglas Holding AG                            13,476,751
                   (retail--general merchandise)

        301,000  Dresdner Bank AG                              16,913,333
                   (financial services)

         65,270  Mannesmann AG                                 63,807,367
                   (industrial equipment
                   & machinery)

        270,000  VEBA AG                                       17,727,731
                   (utilities)

         40,153  Volkswagen AG                                 32,549,799
                   (automobiles & auto parts)        -------------------------

                                                              261,927,357
                                                     -------------------------

GREECE--0.4%

        289,000  Hellenic Telecommunication
                   Organization SA (OTE)                        8,482,439
                   (communications services)         -------------------------

HUNGARY--0.4%

        307,000  Magyar Tavkozlesi Rt. ADR                       8,596,000
                   (communications services)         -------------------------

See Notes to Financial Statements
                                                       www.americancentury.com 9


International Growth--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

IRELAND--2.2%

        801,000  Bank of Ireland                           $  15,048,084
                   (financial services)

        318,000  CBT Group PLC ADR(1)                         15,860,250
                   (computers--software & services)

        196,000  Elan Corp., plc ADR(1)                       11,992,750
                   (pharmaceuticals)

        255,000  Saville Systems Ireland plc ADR(1)           10,215,938
                   (computer software & services)    -------------------------

                                                              53,117,022
                                                     -------------------------

ITALY--4.6%

     11,476,900  Banca di Roma                                23,647,235
                   (banking)

      2,738,600  Banca Intesa S.p.A.                          17,060,310
                   (financial services)

        253,079  Banca Popolare di Bergamo
                   Credito Varesino SpA                        5,948,115
                   (banking)

      3,199,300  Credito Italiano                             17,829,958
                   (banking)

      1,413,381  La Rinascente SpA                             7,551,528
                   (retail--food & drug)

      1,012,300  Mondadori (Arnoldo) Editore SpA              12,370,733
                   (printing & publishing)

      3,661,300  Telecom Italia SpA                           27,646,784
                   (communications services)        -------------------------

                                                             112,054,663
                                                    -------------------------

JAPAN--4.6%

        171,000  Aiwa Co., Ltd.                                5,146,745
                   (electrical & electronic
                   components)

        248,000  Bridgestone Corp.                             5,642,857
                   (automobiles & auto parts)

      2,397,000  Fujitsu Ltd.                                 27,442,612
                   (computer systems)

        298,000  Honda Motor Co., Ltd.                        10,127,880
                   (automobiles & auto parts)

        162,000  Ito--Yokado Co., Ltd.                         8,048,675
                   (retail--general merchandise)

         77,500  Keyence Corporation                           9,313,616
                   (control & measurement)

      1,306,000  Minebea Company Ltd.                         13,362,802
                   (electrical & electronic
                   components)

            240  NTT Data Corp.                                9,608,295
                   (communications services)

        207,000  Sony Corp.                                   17,438,796
                   (electrical & electronic
                   components)

        302,000  Takeda Chemical Inds.                         7,784,850
                   (pharmaceuticals)                 -------------------------

                                                             113,917,128
                                                     -------------------------

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

MEXICO--(3)

      1,184,000  Cemex SA de CV Cl B Rights(1)              $     12,341
                   (building & home improvements)

          20,760  Fomento Economico Mexica UBD(1)                688,903
                   (food & beverage)                 -------------------------

                                                                 701,244
                                                     -------------------------

NETHERLANDS--9.8%

         297,377  ASR Verzekeringsgroep N.V.                  25,940,486
                    (insurance)

         254,500  Cap Gemini N.V.                             19,935,981
                    (computer software & services)

         502,100  Getronics N.V.                              24,956,509
                    (computer software & services)

       1,049,359  ING Groep N.V.                              72,029,665
                    (financial services)

         732,488  Koninklijke Ahold NV                        23,118,936
                    (retail --food & drug)

         190,000  Philips Electronics N.V.                    18,073,750
                    (electrical & electronic
                    components)

         233,000  Unilever N.V.                               18,392,438
                    (diversified companies)

         310,000  Vedior NV
                    (Acquired 1/27/98--2/2/98,
                    Cost $6,674,374)(2)                        9,861,325
                    (business services & supplies)

         854,400  VNU Tijdschriftengroep Nederland            29,302,450
                    (printing & publishing)          -------------------------

                                                             241,611,540
                                                     -------------------------

NORWAY--1.5%

         342,000  Petroleum Geo-Services ASA ADR(1)           22,401,000
                    (energy --services)

       1,611,000  Storebrand ASA                              14,942,361
                    (insurance)                      -------------------------

                                                              37,343,361
                                                     -------------------------

POLAND--0.3%

        605,000  Elektrim Spolka Akcyjna S.A.                  7,954,598
                   (electrical & electronic          -------------------------

components)

PORTUGAL--1.0%

        399,037  Banco Espirito Santo e
                   Comercial de Lisboa, SA(1)                 14,026,292
                   (banking)

        354,700  Banco Espirito Santo e
                    Comercial de Lisboa, SA Rights(1)          2,493,566
                   (banking)

        164,000  Portugal Telecom S.A.                         8,607,983
                   (communications services)         -------------------------

                                                              25,127,841
                                                     -------------------------

SINGAPORE--0.4%

      7,820,100  Dairy Farm International
                   Holdings Ltd.                               8,602,110
                   (retail--food & drug)             -------------------------

See Notes to Financial Statements


10   1-800-345-2021


International Growth--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

SOUTH AFRICA--0.4%

        123,000  Liberty Life Association of Africa Ltd.   $   3,411,696
                   (insurance)

        193,000  South African Breweries Ltd.                  5,443,158
                   (food & beverage)                 -------------------------

                                                               8,854,854
                                                     -------------------------

SPAIN--3.0%

         85,000  Banco Popular Espanol SA                      6,736,335
                   (banking)

        135,000  Corporacion Bancaria de Espana SA            11,491,066
                   (banking)

        876,000  Telefonica de Espana                         39,101,470
                   (communications services)

      1,620,000  TelePizza, S.A.(1)                           16,288,653
                   (restaurants)                     -------------------------

                                                              73,617,524
                                                     -------------------------

SWEDEN--4.9%

        171,000  Assa Abloy AB Cl B                            6,692,461
                   (construction & property
                   development)

        176,000  Electrolux AB Cl B                           17,500,829
                   (consumer products)

        992,000  Ericsson (L.M.) Telephone Co. ADR            27,683,000
                   (communications equipment)

        245,000  Europolitan Holdings AB                      15,210,601
                   (communications equipment)

        218,900  Hennes & Mauritz AB Cl B                     12,278,626
                   (retail--apparel)

        361,000  NetCom Systems AB Cl B(1)                    13,806,379
                   (communications services)

      1,828,000  Skandia Forsakrings AB                       26,682,899
                   (financial services)              -------------------------

                                                             119,854,795
                                                     -------------------------

SWITZERLAND--8.9%

        182,900  Credit Suisse Group                          40,197,802
                   (banking)

         18,000  Julius Baer Holding AG                       51,816,895
                   (financial services)

          2,000  Kuoni Reisen Holding AG                      10,719,342
                   (transportation)

         20,000  Nestle S.A.                                  42,782,984
                   (food & beverage)

         20,755  Novartis AG                                  35,093,063
                   (pharmaceuticals)

         22,000  Union Bank of Switzerland                    36,931,167
                   (banking)                         -------------------------

                                                             217,541,253
                                                     -------------------------

UNITED KINGDOM--13.7%

      2,419,200  Amvescap Plc                                 25,883,193
                   (financial services)

      3,417,880  British Aerospace PLC                        30,292,144
                   (aerospace & defense)

      1,307,000  British Airways plc                          13,834,356
                   (airlines)

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

      1,718,000  Capita Group Plc                          $  15,170,287
                   (business services & supplies)

        269,000  CMG plc                                       7,551,863
                   (computer software & services)

        747,000  Compass Group PLC                            15,484,518
                   (restaurants)

      1,652,000  Diageo plc                                   18,672,531
                   (food & beverage)

        306,146  Energis plc(1)                                4,322,331
                   (communications services)

      1,062,000  Hays plc                                     19,414,040
                   (business services & supplies)

        537,000  Logica plc                                   15,842,582
                   (computer software & services)

        949,834  Misys plc                                    57,299,792
                   (computer software & services)

        446,754  Provident Financial plc                       7,007,534
                   (financial services)

        286,500  Schroders plc                                 8,407,903
                   (financial services)

        280,300  SEMA Group plc                               10,980,136
                   (computer software & services)

        243,000  Siebe plc                                     6,088,188
                   (diversified companies)

      1,924,000  Somerfield plc                               12,451,499
                   (retail --food & drug)

      2,509,765  Thomson Travel Group plc(1)                   7,353,107
                   (leisure)

      2,633,000  Vodafone Group plc                           28,922,731
                   (communications services)

      2,889,200  WPP Group plc                                18,485,749
                   (business services & supplies)

        322,000  Zeneca Group plc                             13,081,397
                   (pharmaceuticals)                 -------------------------

                                                             336,545,881
                                                     -------------------------

TOTAL COMMON STOCKS & RIGHTS--94.3%                        2,314,350,514
   (Cost $1,707,732,965)                             -------------------------

PREFERRED STOCKS

BRAZIL--0.2%

     30,136,000  Telecomunicacoes do
                   Rio de Janeiro S.A.                         2,515,154
                   (communications services)

     30,136,000  Telerj Celular S.A. Cl B(1)                   2,200,760
                   (communications equipment)        -------------------------

                                                               4,715,914
                                                     -------------------------

GERMANY--1.7%

        174,000  Henkel KGaA                                  15,596,639
                   (chemicals & resins)

         50,000  SAP AG                                       27,731,092
                   (computer software & services)    -------------------------

                                                              43,327,731
                                                     -------------------------

TOTAL PREFERRED STOCKS--1.9%                                  48,043,645
   (Cost $32,731,405)                                -------------------------

See Notes to Financial Statements
                                                      www.americancentury.com 11


International Growth--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

TEMPORARY CASH INVESTMENTS--3.8%

    Repurchase Agreement, State Street Boston
       Corp., 5.48%, due 6/1/98, collateralized by
       $92,150,000 par value U.S. Treasury Notes,
       5.625%, due 12/31/02
       (Delivery value $96,642,287)                        $     92,600,000
   (Cost $92,600,000)                                 -------------------------


TOTAL INVESTMENT SECURITIES--100.0%                          $2,454,994,159
   (Cost $1,833,064,370)                              =========================

FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS

        Contracts          Settlement                           Unrealized
         to Sell              Date            Value                Gain
- --------------------------------------------------------------------------------
     31,158,633  CHF        6/29/98       $ 21,067,337       $  179,600
     47,737,665  DEM        6/29/98         26,785,987          214,955
    199,027,966  FRF        6/29/98         33,301,108          303,155
     20,637,252  GBP        6/29/98         33,640,186           58,991
  1,460,526,200  JPY        6/29/98         10,556,825           84,609
     48,967,394  NLG        6/29/98         24,377,861          195,776
     95,527,937  SEK        6/29/98         12,188,090          136,505
                                        ---------------------------------------
                                          $161,917,394       $1,173,591
                                        =======================================
(Value on Settlement Date $163,090,985)

Forward foreign currency exchange contracts are used by the portfolio management
team in an effort to protect  foreign  investments  against  declines in foreign
currencies.  This is also known as hedging.  The contracts are called  "forward"
because they allow your fund to exchange a foreign  currency for U.S. dollars at
a date in the future -- and at a price (known as the exchange  rate) agreed upon
when the contract is initially entered into.


NOTES TO SCHEDULE OF INVESTMENTS

ADR = American Depositary Receipt
CHF = Swiss Franc
DEM = German Mark
FRF = French Franc
GBP = British Pound
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, 1998,  was  $41,137,696,  which  represented  1.7% of net
assets.
(3) Country was less than 0.05% of total investment securities.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  shows  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

*    the percentage of total investments in each country

*    a list of each investment

*    the number of shares of each stock

*    the market value of each investment

*    the percent and dollar breakdown of each investment category

See Notes to Financial Statements


12   1-800-345-2021


<TABLE>
International Discovery--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF MAY 31, 1998

                           INVESTOR CLASS                  ADVISOR CLASS               INSTITUTIONAL CLASS
                         (INCEPTION 4/1/94)             (INCEPTION 4/28/98)             (INCEPTION 1/2/98)

                    INTERNATIONAL      MSCI          INTERNATIONAL      MSCI        INTERNATIONAL     MSCI
                     DISCOVERY      EAFE(reg.tm)      DISCOVERY      EAFE(reg.tm)     DISCOVERY   EAFE(reg.tm)

<S>                     <C>            <C>               <C>           <C>          <C>          <C>
6 MONTHS(1) .........  33.92%         16.06%              --             --              --              --

1 YEAR ..............  36.97%         11.11%              --             --              --              --
- -------------------------------------------------------------------------------------------------------------------------

AVERAGE ANNUAL RETURNS

3 YEARS .............   31.07%         9.76%              --             --              --              --

LIFE OF FUND ........   23.61%         9.11%             6.73%        -0.49%(2)       31.91%(1)       15.06%(1)
</TABLE>

(1)  Returns for periods less than one year are not annualized.

(2)  Return from 4/30/98, the nearest date for which data are available.

See pages 45, 46 and 47 for information  about share classes,  MSCI EAFE(reg.tm)
and returns.


These  charts are based on Investor  Class shares  only;  performance  for other
classes will vary due to differences  in fee  structures  (see the Total Returns
table above).  The chart at left shows the growth of a $10,000 investment in the
fund  since  inception,  while the chart  below  shows the  fund's  year-by-year
performance.  The MSCI  EAFE(reg.tm)  is provided for  comparison in each chart.
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.  International   Discovery's  total  returns  include  operating
expenses (such as transaction  costs and management  fees) that reduce  returns,
while the total returns of the MSCI EAFE(reg.tm) do not.


[mountain chart]
GROWTH OF $10,000 OVER LIFE OF FUND

VALUE ON 5/31/98
International Discovery         $24,103
MSCI EAFE Index                 $14,382

            INTERNATIONAL DISCOVERY          EAFE
DATE            ACCT VALUE               ACCT VALUE
4/01/94           $10,000                   $10,000
6/30/94           $10,760                   $10,511
9/30/94           $11,420                   $10,521
12/31/94          $10,760                   $10,414
3/31/95           $10,100                   $10,608
6/30/95           $11,020                   $10,685
9/30/95           $11,800                   $11,130
12/31/95          $11,825                   $11,581
3/31/96           $12,931                   $11,916
6/30/96           $14,479                   $12,104
9/30/96           $14,559                   $12,089
12/31/96          $15,511                   $12,281
3/31/97           $16,712                   $12,089
6/30/97           $18,293                   $13,658
9/30/97           $19,789                   $13,562
12/31/97          $18,223                   $12,500
3/31/98           $21,957                   $14,338
5/31/98           $24,103                   $14,382

[bar chart]
ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDING MAY 31)
                   INTERNATIONAL DISCOVERY          EAFE (reg. tm)
4/1/94-5/31/94              9.80%                       3.64%
5/31/95                    -2.37%                       4.93%
5/31/96                    33.00%                      10.67%
5/31/97                    23.42%                       7.54%
5/31/98                    36.97%                      11.11%

*Returns from 4/1/94 to 5/31/94
                                                      www.americancentury.com 13


International Discovery--Q&A
- --------------------------------------------------------------------------------

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

HOW DID THE FUND PERFORM DURING THE SIX MONTHS ENDED MAY 31, 1998?

     International Discovery has had an excellent first half to its fiscal year,
generating a 33.92% total  return.* By comparison,  the Morgan  Stanley  Capital
International  EAFE Index gained  16.06%.  For the 12 months ended May 31, 1998,
Discovery returned 36.97% versus 11.11% for EAFE.

     We should  emphasize  once again  that our  bottom-up  approach  to finding
companies with  accelerating  revenue and earnings growth  accounted for most of
the difference in performance.  As we reported six months ago, this approach led
us to European companies,  where an earnings expansion was underway. Since then,
the growth rates of European  economies and companies  have actually  increased,
while  the  economic  contraction  that had just  begun  in  Southeast  Asia has
intensified.  Relative  to  EAFE,  Discovery  had a  much  greater  exposure  to
businesses in Europe and a lighter  weighting in Asia,  and that goes a long way
toward explaining the wide performance gap between the fund and its benchmark.

HOW DID DISCOVERY PERFORM COMPARED TO OTHER INTERNATIONAL EQUITY FUNDS?

     International Discovery maintained its five-star rating from Morningstar, a
large mutual fund rating firm. The rating applies for the three years ending May
31,  1998,  and  puts  Discovery  in  the  top  10%  of  the  764  funds  in its
international equity fund category.(+)

DISCOVERY HAS ABOUT 83% OF ITS ASSETS IN EUROPE. WHY?

     We are finding high growth rates on the  Continent for a number of reasons.
The biggest  factor is the pending  European  Monetary  Union (EMU),  which will
introduce a single  currency  (the euro) and unify the  economies of 11 European
countries.  To  participate  in the EMU,  these  countries  were required to cut
government spending sharply and reduce inflation. The resulting drop in interest
rates  coupled  with  business  restructuring  across  Europe has been a boon to
corporate  profits.  In addition,  compensation of managers is now  increasingly
tied  to  share  price  performance,  creating  strong  incentives  to  increase
shareholder  value.  European  companies  have  pushed  well ahead of any change
enacted by government  because they recognize the need to stay  competitive  and
productive.

     We are always looking for the strongest  accelerating  growth stocks we can
find,  wherever  they are  located.  Although we found a wealth of good ideas in
Europe, we continue to investigate growth  opportunities  worldwide.  Members of
our team visited 21 countries in the past six months, including Singapore, Peru,
South Africa and Germany.

*All fund returns referenced are for Investor Class shares.

(+)Morningstar  proprietary ratings reflect risk-adjusted  performance as of May
31, 1998. The overall rating,  which may change monthly,  is calculated from the
fund's  three-year  average  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.  Ten percent of the funds in an
investment  category  receive five stars.  Past  performance  is no guarantee of
future results.


[left margin]

PORTFOLIO AT A GLANCE
                                     5/31/98          11/30/97

NO. OF COMPANIES                      161               154

MEDIAN MARKET                        $589              $451
CAPITALIZATION                      MILLION           MILLION

PORTFOLIO TURNOVER                  86%(1)            146%(2)

EXPENSE RATIO (FOR
INVESTOR CLASS)                     1.66(3)            1.70%


"The growth rates of European  economies and companies have actually  increased,
while  the  economic  contraction  that had just  begun  in  Southeast  Asia has
intensified."

(1)       Six months ended 5/31/98.
(2)       Year ended 11/30/97.
(3)       Annualized.

Investment terms are defined in the Glossary on page 47.


14   1-800-345-2021


International Discovery--Q&A (continued)
- --------------------------------------------------------------------------------

WHICH COMPANIES WERE AMONG DISCOVERY'S BEST PERFORMERS?

     The  environment  we've just described has created huge  opportunities  for
companies  that help  manage  change,  and these  companies  have  produced  the
portfolio's  best  returns.  Financial  services,   information  technology  and
temporary  employment are among the industries  generating the most  significant
earnings growth.

     Among  financial  service  companies,  those  engaged in asset  management,
insurance brokerage and banking have been outstanding  performers.  Marschollek,
Lautenschlaeger und Partner, a German financial service company,  Banco Popolare
di Brescia of Italy, and Kempen & Company of Holland posted  excellent  results.
As interest rates dropped  across  Europe,  savers have shifted assets away from
conservative bank accounts and into the mutual fund and insurance products these
companies offer. Some European countries, to a greater extent than America, face
the problem of too few workers supporting too many retirees. We expect financial
stocks to continue to perform well as workers  increasingly  turn to  retirement
plans like defined  contribution  plans and other investment  vehicles to manage
their savings.

     In the information  technology area, CGI Group of Canada and Tieto Corp. in
Finland  also  posted  substantial  gains.  Both are  helping  companies  update
software  to  enable  computers  to  distinguish  the year 2000  from  1900.  In
addition, Tieto installs, builds and tests computer networks that are being used
by European companies facing conversion to the new euro currency.

WHICH STOCKS OR SECTORS HELD BACK PERFORMANCE?

     Energy services was the worst-performing  group, although the downward move
was modest.  Falling oil prices,  in the wake of  overproduction  and  depressed
demand in Asia, led to diminished  earnings  expectations  for the oil industry,
which hurt the shares of service companies that provide equipment and technology
to oil drillers.

     Tecnomatix  Technologies  was  one  of  our  weakest  individual  holdings.
Tecnomatix  makes  software  that  designs  manufacturing  plants,  among  other
applications.  The stock dropped after the company  announced that profits would
not meet  expectations.  Although  we  believe  this is a solid  company  with a
promising  product line, we sold the position after a disruption in its shipment
flow raised questions about the sustainability of its earnings.

WHAT CHANGES HAVE YOU MADE IN THE PORTFOLIO DURING THE LAST SIX MONTHS?

     As you can see from the chart to the right,  holdings in financial services
and business services have climbed as we responded to positive trends in Europe.
In terms of investments by country,  little has changed. The themes that applied
six months ago are still in place:  An economic  revival in Europe is  producing
some of the strongest  growth  stories on the globe,  while Asian  economies are
contracting.

TOP TEN HOLDINGS
                                  % OF FUND INVESTMENTS
                                  AS OF           AS OF
                                 5/31/98        11/30/97
MARSCHOLLEK,
     LAUTENSCHLAEGER
     UND PARTNER AG               3.9%            2.8%
HAVAS ADVERTISING SA              2.5%            1.6%
KEMPEN &
     COMPANY NV                   2.5%            1.9%
CGI GROUP, INC.                   2.1%            0.8%
TIETO CORP. CL B                  2.0%            1.9%
INTERNATIO-MULLER NV              2.0%            1.8%
CORPORACION
     FINANCIERA
     REUNIDA, S.A.                1.7%            1.4%
VERWALTUNGS-UND
     PRIVAT-BANK AG               1.7%            0.6%
MERKANTILDATA ASA                 1.7%             --
VONTOBEL HOLDING
     AG CL B                      1.6%            1.3%


TOP FIVE INDUSTRIES
                                   % OF FUND INVESTMENTS
                                  AS OF           AS OF
                                 5/31/98         11/30/97
FINANCIAL SERVICES                15.9%           12.5%
BUSINESS SERVICES
     & SUPPLIES                   12.9%            5.9%
COMPUTER SOFTWARE
     & SERVICES                   12.8%           12.5%
BANKING                            8.5%            4.3%
ELECTRICAL & ELECTRONIC
     COMPONENTS                    4.3%            2.4%


                                              www.americancentury.com    15


International Discovery--Q&A (continued)
- --------------------------------------------------------------------------------

DO YOU EXPECT THE RAPID GROWTH RATES YOU ARE SEEING IN EUROPE TO CONTINUE?

     Frankly,  we were surprised at the magnitude of European  earnings  growth.
Economies  there are among the  fastest  growing  in the  world  right  now.  In
addition, a confluence of factors, such as the introduction of a common currency
and a huge shift in corporate strategies,  are providing a foundation for strong
profit growth.  Regardless of these macro  factors,  we will continue to use our
bottom-up  strategy in an effort to make sure the  portfolio has the best growth
stocks from around the globe.


[pie charts]

TYPES OF INVESTMENTS IN  THE PORTFOLIO

AS OF MAY 31, 1998
Repurchase Agreements       0.7%
Preferred Stocks            5.9%
Common Stocks & Warrants   93.4%

AS OF NOVEMBER 30, 1997
Repurchase Agreements       4.7%
Preferred Stocks            5.7%
Common Stocks & Warrants   89.6%

[bar chart]
INTERNATIONAL DISCOVERY'S INVESTMENTS BY COUNTRY
                 5/31/98                 11/30/97
Netherlands       14.1%                   12.5%
U.K.              13.4%                   12.6%
Germany           10.1%                    6.6%
Canada             9.0%                    9.6%
France             8.6%                    5.5%
Switzerland        5.5%                    7.1%
Finland            5.5%                    6.4%
Spain              4.2%                    2.6%
Other             29.6%                   37.1%


16   1-800-345-2021


International Discovery--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

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

COMMON STOCKS & WARRANTS

AUSTRIA--1.0%

        148,000  Erste Bank Der Oesterreichischen
                   Sparkassen AG                              $  8,968,269
                   (banking)                          ------------------------

BELGIUM--1.4%

         22,000   Creyf's NV                                     5,734,378
                   (business services & supplies)

         70,000  Telinfo NV(1)                                   6,880,167
                   (communications services)          ------------------------

                                                                12,614,545
                                                      ------------------------

CANADA--9.0%

        233,300  Architel Systems Corp.(1)                       2,491,203
                   (computer peripherals)

        387,400  Berkley Petroleum Corp.(1)                      3,152,405
                   (energy--services)

        245,000  Boardwalk Equities, Inc.(1)                     3,701,282
                   (financial services)

        474,700  Bracknell Corp.(1)                              1,695,066
                   (business services & supplies)

         932,000  Canadian 88 Energy Corp.(1)                    4,160,000
                   (energy production & marketing)

         151,000  Certicom Corp.(1)                              3,421,803
                   (computer peripherals)

         919,000  CGI Group, Inc.(1)                            18,995,296
                   (business services & supplies)

         165,000  Dorel Industries Inc. Cl B(1)                  5,523,605
                   (furniture & furnishings)

         164,000  JetForm Corp.(1)                               3,126,250
                   (computer software & services)

         520,000  Kingsway Financial Services(1)                 6,320,343
                   (insurance)

         235,300  Newcourt Credit Group Inc.
                   (Acquired 12/4/95-8/7/97,
                   Cost $1,659,961)(2)                          11,552,927
                   (financial services)

          75,000  Perigee Inc.(1)                                1,125,322
                   (financial services)

         223,000  QLT PhotoTherapeutics, Inc.(1)                 4,303,039
                   (biotechnology)

         142,000  Rand A Technology Corp.(1)                     2,779,056
                   (computer software & services)

         349,200  Royal Group Technologies Ltd.(1)               9,459,873
                   (building & home improvements)     ------------------------

                                                                81,807,470
                                                      ------------------------

CROATIA--0.2%

         121,888  Pliva d.d. GDR                                 2,005,058
                   (pharmaceuticals)                  ------------------------

DENMARK--0.3%

          70,000  Vestas Wind Systems A/S(1)                     2,882,395
                   (utilities)                        ------------------------

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

FINLAND--5.5%

         331,723  Asko Oyj Cl A                               $  7,122,849
                    (diversified companies)

         401,000  Finnair Oyj                                    4,138,897
                    (airlines)

          35,000  Fiskars Oyj AB Cl A                            4,967,193
                    (diversified companies)

          102,500  KCI Konecranes International plc
                    (Acquired 5/12/98-5/26/98,
                    Cost $5,588,828)(2)                          5,270,846
                    (machinery & equipment)

           89,450  OY Hartwall AB                                2,596,648
                    (food & beverage)

          130,000  Pohjola Insurance Group Cl B                  7,116,264
                    (insurance)

           85,000  Tieto Corp. Cl B                             18,643,099
                    (computer software & services)    ------------------------

                                                                49,855,796
                                                      ------------------------

FRANCE--8.6%

           33,000  Altran Technologies SA                        6,753,258
                     (business services & supplies)

           55,000  Cie des Signaux SA                            4,274,307
                     (aerospace & defense)

           13,000  Galeries Lafayette                           12,596,057
                     (retail--general merchandise)

          110,000  Havas Advertising SA                         23,245,907
                     (broadcasting & media)

          110,000  Havas Advertising Warrants(1)                   312,396
                     (broadcasting & media)

           99,000  Infogrames Entertainment SA(1)                6,251,587
                     (leisure)

           21,000  Jet Multimedia(1)                             4,490,478
                     (computer software & services)

           20,538  Le Carbone-Lorraine                           9,366,646
                     (electrical & electronic
                     components)

           21,066  NRJ SA                                        3,501,615
                     (broadcasting & media)

           40,000  Omnicom SA(1)                                 4,710,992
                     (communications equipment)

           71,000  Societe Generale
                     d'Entreprises SA(1)                         3,285,500
                     (construction & property         ------------------------
                     development)

                                                                78,788,743
                                                      ------------------------

GERMANY--4.2%

            4,000  Aixtron AG                                    1,622,409
                     (machinery & equipment)

           48,000  DIS Deutscher Industrie Service AG            3,495,798
                     (business services & supplies)

           21,000  DLW AG(1)                                     3,635,294
                     (construction & property
                     development)

            5,000  Porsche AG                                   13,725,490
                     (automobiles & auto parts)

See Notes to Financial Statements


                                                  www.americancentury.com   17


International Discovery--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

           11,795  Sartorius AG                               $  5,947,059
                     (electrical & electronic
                     components)

           52,000  Sixt AG                                       8,098,599
                     (business services & supplies)

           38,700  Winkler & Duennebier AG(1)                    1,799,496
                     (machinery & equipment)          -------------------------

                                                                38,324,145
                                                      -------------------------

GREECE--1.8%

          175,000  Athens Medical Care S.A.                      3,712,573
                     (healthcare)

           61,000  Intrasoft S.A.                                4,059,932
                     (communications services)

          261,000  Mytilineos S.A.                               4,048,569
                     (metals & mining)

           66,000  National Mortgage Bank of Greece              4,720,624
                     (banking)                        -------------------------

                                                                16,541,698
                                                      -------------------------

HONG KONG--0.3%

        5,094,954  Founder Hong Kong Limited                     3,172,429
                     (computer software & services)   --------------------------

INDIA--1.6%

          774,000  Corporation Bank(1)                           2,176,120
                     (banking)

           85,000  Hero Honda Motors Ltd.                        2,208,163
                     (leisure)

              550  Indian Hotels Company Limited                     6,840
                     (leisure)

            8,000  Larsen & Toubro Ltd.                             49,114
                     (diversified companies)

          120,000  NIIT Limited                                  4,797,119
                     (computer software & services)

             200   Oriental Bank of Commerce                           305
                     (banking)

          156,000  Pentafour Software & Exports Ltd.             3,915,918
                     (computer software & services)

          100,000  Satyam Computer                               1,339,136
                     (computer software & services)   -------------------------

                                                                14,492,715
                                                      -------------------------

IRELAND--0.7%

        2,454,000  Anglo Irish Bank Corp. plc                    6,648,995
                     (banking)                        -------------------------

ISRAEL--0.6%

          636,200  Oshap Technologies, Ltd.(1)(3)                5,308,294
                     (computer software & services)   --------------------------

ITALY--2.5%

          180,000  Banca Nazionale del Lavoro(1)                 4,859,749
                     (financial services)

          260,000  Banca Popolare di Brescia                     5,371,870
                     (banking)

        5,042,000  Ciga Spa(1)                                   5,703,004
                     (leisure)


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

          486,000  Gruppo Editoriale L'Espresso               $  4,419,814
                     (printing & publishing)

        2,782,900  Premafin Finanziaria S.p.A.(1)                2,404,302
                     (insurance)                      -------------------------

                                                                22,758,739
                                                      -------------------------

JAPAN--2.4%

          124,000  Fuji Soft ABC, Inc.                           4,330,357
                     (computer software & services)

           48,400  Fujimi Incorporated                           1,847,062
                     (electrical & electronic
                     components)

           89,000  Itoen, Ltd.                                   2,742,800
                     (food & beverage)

          116,000  Meitec                                        3,950,749
                     (computer software & services)

           69,580  Ministop Co., Ltd.                            1,350,217
                     (retail--food & drug)

           75,000  Nippon System Development                     1,933,324
                     (computer software & services)

           97,000  Noritsu Koki Co. Limited                      2,507,416
                     (electrical & electronic
                     components)

           11,000  Ryohin Keikaku Company Limited                  982,143
                     (retail--general merchandise)

          319,000  Yoshitomi Pharmaceutical
                      Industries, Ltd.                           1,963,890
                      (healthcare)                    -------------------------

                                                                21,607,958
                                                      -------------------------

LIECHTENSTEIN--1.6%

            5,000  Verwaltungs-und Privat-Bank AG               15,084,609
                     (banking)                        -------------------------

MEXICO--0.4%

           19,000  ARA, S.A. de C.V.(1)                             75,772
                     (construction & property
                     development)

        3,030,000  Biper, S.A. de C.V. Series B(1)               1,414,332
                     (communications services)

          523,600  Corporacion Interamericana de
                      Entretenimiento S.A. Cl B(1)               1,753,819
                      (leisure)                       -------------------------

                                                                 3,243,923
                                                      -------------------------

NETHERLANDS--14.1%

          247,227  Aalberts Industries N.V.                      7,544,976
                     (metals & mining)

           44,500  Atag Holding N.V.                             3,067,821
                     (consumer products)

           56,000  Athlon Groep N.V.                             9,992,544
                     (business services & supplies)

          101,537  Brunel International NV.                      3,961,755
                     (business services & supplies)

           57,400  Draka Holding N.V.                            2,453,601
                     (electrical & electronic
                     components)

See Notes to Financial Statements


18   1-800-345-2021


International Discovery--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

          100,000  Fugro N.V.                                 $  4,771,609
                     (business services & supplies)

           88,000  GTI Holding N.V.                              3,477,310
                     (construction & property

development)

          501,400  Internatio-Muller NV                         18,068,244
                     (transportation)

          321,337  Kempen & Company NV                          22,711,925
                     (financial services)

          251,264  Ordina Beheer N.V.(1)                         8,454,979
                     (computer software & services)

           81,000  Samas Groep N.V.                              6,018,937
                     (office equipment & supplies)

           49,126  Simac Techniek N.V.                          10,072,307
                     (computer software & services)

          324,571  Unique International NV                      10,857,214
                     (business services & supplies)

          183,000  Unit 4(1)                                     5,912,322
                     (computer software & services)

          153,750  Van der Moolen Holding N.V.                  11,119,154
                     (banking)                        -------------------------

                                                               128,484,698
                                                      -------------------------

NORWAY--3.6%

          130,000  ContextVision AB(1)                           2,463,230
                     (computer software & services)

          175,000  Det Sondenfjelds-Norske
                      Dampskibsselskab Cl A                      3,744,866
                     (energy--services)

        1,079,000  Merkantildata ASA                            15,083,411
                     (financial services)

          146,000  Provida ASA(1)                                3,250,033
                     (computer software & services)

          203,000  Tandberg Television ASA(1)                    2,084,603
                     (communications equipment)

          200,000  Tomra Systems ASA                             6,201,140
                     (environmental services)         -------------------------

                                                                32,827,283
                                                      -------------------------

POLAND--1.0%

          590,000  Elektrim Spolka Akcyjna S.A.                  7,757,376
                     (electrical & electronic
                     components)

          127,750  Wielkopolski Bank Kredytowy S.A.(1)             914,852
                     (banking)                        -------------------------

                                                                 8,672,228
                                                      -------------------------

PORTUGAL--3.7%

          628,300  Banco Mello, S.A.                             8,746,046
                     (banking)

          313,000  Companhia de Seguros Mundial
                     Confianca, SA(1)                            9,626,162
                     (insurance)

          399,000  Espirito Santo Financial
                     Holding S.A. ADR                           10,149,563
                     (banking)

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

           32,000  Telecel-Comunicacaoes
                     Pessoais, SA(1)                          $  5,598,688
                     (communications services)        -------------------------

                                                                34,120,459
                                                      -------------------------

RUSSIAN FEDERATION--0.1%

           65,400  SUN Brewing Ltd. GDR(1)                         868,336
                     (food & beverage)                -------------------------

SINGAPORE--0.3%

          927,000  Datacraft Asia Limited                        2,688,300
                      (communications services)       -------------------------

SOUTH AFRICA--1.1%

          533,581  Primedia Limited Cl N                         4,243,395
                     (broadcasting & media)

          406,600  Sage Group Limited                            2,149,132
                     (insurance)

          948,300  Super Group Limited(1)                        3,678,790
                     (transportation)                 -------------------------

                                                                10,071,317
                                                      -------------------------

SPAIN--4.2%

           27,000  Azkoyen SA                                    4,165,623
                     (financial services)

            4,454  Banco Pastor SA                                 246,678
                     (banking)

           79,000  Campofrio Alimentacion SA(1)                  6,641,063
                     (food & beverage)

        1,087,000  Corporacion Financiera
                      Reunida, S.A.(1)                          15,695,457
                     (financial services)

           44,000  Grupo Acciona SA                             11,314,037
                     (construction & property         -------------------------
                     development)

                                                                38,062,858
                                                      -------------------------

SWEDEN--3.7%

           51,000  ADB-Gruppen Mandator AB                       1,885,470
                     (computer software & services)

          418,252  Castellum AB                                  5,065,391
                     (real estate)

          195,000  Enator AB                                     6,140,206
                     (computer software & services)

           36,000  Enea Data AB Cl B                             2,850,004
                     (computer software & services)

          399,100  OM Gruppen AB                                 8,140,537
                     (financial services)

            9,049  Resco AB Cl B                                   298,780
                     (computer software & services)

          166,000  Scandic Hotels AB                             6,348,640
                     (leisure)

           87,000  Sigma AB Cl B                                 2,861,477
                     (computer software & services)   -------------------------

                                                                33,590,505
                                                      -------------------------

See Notes to Financial Statements

                                                   www.americancentury.com   19


International Discovery--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

SWITZERLAND--5.5%

           15,200  Danzas Holding AG                         $   4,334,659
                     (railroad)

           15,125  Georg Fischer AG                              6,627,958
                     (machinery & equipment)

              600  Kudelski SA                                   4,591,114
                     (electrical & electronic
                     components)

          126,000  MFC Bancorp Ltd.                              1,472,625
                     (financial services)

            7,000  Moevenpick Holding AG Bearer                  3,987,730
                     (leisure)

            4,000  Phoenix Mecano AG                             2,615,789
                     (electrical & electronic
                     components)

            6,000  Rieter Holdings Ltd.(1)                      4,546,619
                     (machinery & equipment)

            8,000  SAIA-Burgess Electronics AG(1)               2,292,186
                     (electrical & electronic
                     components)

           50,000  Swisslog Holding AG                           5,224,837
                     (machinery & equipment)

           10,500  Vontobel Holding AG Cl B                     14,865,503
                     (financial services)             -------------------------

                                                                50,559,020
                                                      -------------------------

TURKEY--0.2%

       31,863,000  Aksigorta A.S.                                1,942,712
                     (insurance)                      -------------------------

UNITED KINGDOM--13.4%

          380,000  Admiral plc                                   7,659,915
                     (business services & supplies)

        1,400,000  Ashtead Group plc                             6,226,843
                     (industrial equipment & machinery)

          621,291  Bodycote International plc                   12,726,593
                     (diversified companies)

          423,000  Close Brothers Group plc                      5,626,928
                     (financial services)

          460,000  Computacenter plc(1)                          5,473,419
                     (computer software & services)

        2,130,000  Electronics Boutique plc(1)                   3,407,054
                     (retail--general merchandise)

          370,000  Goode Durrant plc                             3,442,310
                     (business services & supplies)

          799,000  Iceland Group Plc                             3,175,551
                     (food & beverage)

          854,000  Jarvis plc                                   10,656,356
                     (construction & property
                     development)

        1,664,000  London Scottish Bank plc                      4,006,072
                     (banking)

        1,101,000  Meggitt plc                                   4,169,161
                     (industrial equipment & machinery)

          334,000  Micro Focus Group plc(1)                      3,039,238
                     (computer software & services)

          302,000  MSB International PLC                         4,966,213
                     (business services & supplies)

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

          348,000  Northern Leisure plc                      $   2,945,109
                     (leisure)

          490,250  Parity plc                                    6,841,591
                     (business services & supplies)

          720,237  Robert Walters plc                            6,060,068
                     (business services & supplies)

          269,000  Sage Group plc (The)                          6,498,115
                     (computer software & services)

          621,000  Select Appointments Holdings plc              8,884,171
                     (business services & supplies)

        1,911,700  SkyePharma plc(1)                             2,558,627
                     (pharmaceuticals)

        2,147,000  Taylor Nelson AGB plc                         4,765,893
                     (broadcasting & media)

          412,500  Triad Group PLC                               5,026,054
                     (business services & supplies)

          550,000  WS Atkins plc                                 4,591,787
                     (textiles & apparel)             -------------------------

                                                               122,747,068
                                                      -------------------------

UNITED STATES--0.4%

           99,700  Global TeleSystems Group, Inc.(1)             3,816,641
                     (communications services)        -------------------------

TOTAL COMMON STOCKS & WARRANTS--93.4%                          852,557,206
   (Cost $594,624,921)                                -------------------------

PREFERRED STOCKS

GERMANY--5.9%

            9,000  Friedrich Grohe AG                            3,126,050
                     (machinery & equipment)

            5,500  Hugo Boss AG                                 11,862,745
                     (textiles & apparel)

            7,000  Jil Sander AG                                 2,960,784
                     (textiles & apparel)

           72,000  Marschollek, Lautenschlaeger
                     und Partner AG                             35,697,479
                     (financial services)             -------------------------

TOTAL PREFERRED STOCKS--5.9%                                    53,647,058
   (Cost $22,113,458)                                 -------------------------

TEMPORARY CASH INVESTMENTS-0.7%

    Repurchase  Agreement,  State  Street 
       Boston  Corp., 5.48%, due 6/1/98,
       collateralized by $6,370,000 par value 
       U.S. Treasury Notes, 5.625%, due 12/31/02
       (Delivery value $6,402,923)                                6,400,000
   (Cost $6,400,000)                                  -------------------------

TOTAL INVESTMENT SECURITIES--100.0%                        $    912,604,264
   (Cost $623,138,379)                                =========================

See Notes to Financial Statements


20   1-800-345-2021


International Discovery--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS

      Contracts            Settlement                         Unrealized
       to Sell               Date              Value             Gain
- --------------------------------------------------------------------------------

    9,633,441  CHF         6/29/98         $ 6,513,474        $ 55,528
   14,403,718  DEM         6/29/98           8,082,042          64,857
   27,546,295  FIM         6/29/98           5,084,476          45,187
   44,894,064  FRF         6/29/98           7,511,618          68,382
    7,738,313  GBP         6/29/98          12,614,000          22,120
  259,354,809  JPY         6/29/98           1,874,642          15,025
    5,192,142  NLG         6/29/98          12,541,622         100,720
    2,806,311  SEK         6/29/98           2,909,781          32,589
                                       ----------------------------------------
                                           $57,131,655        $404,408
                                       ========================================

(Value on Settlement Date $57,536,063)

Forward foreign currency exchange contracts are used by the portfolio management
team in an effort to protect  foreign  investments  against  declines in foreign
currencies.  This is also known as hedging.  The contracts are called  "forward"
because they allow your fund to exchange a foreign  currency for U.S. dollars at
a date in the future -- and at a price (known as the exchange  rate) agreed upon
when the contract is initially entered into.

NOTES TO SCHEDULE OF INVESTMENTS

ADR = American Depositary Receipt
CHF = Swiss Franc
DEM = German Mark
FIM = Finnish Markka
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, 1998,  was  $16,823,773,  which  represented  1.8% of net
assets.
(3)  Affiliated  Company:  represents  ownership  of at least  5% of the  voting
securities  of the  issuer and is,  therefore,  an  affiliate  as defined in the
Investment Company Act of 1940. See Note 5 in Notes to Financial  Statements for
a summary of transactions for each issuer which is or was an affiliate at or for
the six months ended May 31, 1998.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  shows  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

*    the percentage of total investments in each country

*    a list of each investment

*    the number of shares of each stock

*    the market value of each investment

*    the percent and dollar breakdown of each investment category

See Notes to Financial Statements
                                                      www.americancentury.com 21


Emerging Markets--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF MAY 31, 1998(1)
                                        INVESTOR CLASS (INCEPTION 9/30/97)
                                       EMERGING           MSCI EMERGING
                                       MARKETS          MARKETS FREE INDEX

6 MONTHS ...........................    2.41%                 -7.17%

LIFE OF FUND .......................  -15.00%                -25.24%

(1) Returns for periods less than one year are not annualized.

See  pages  46 and 47 for  information  about  MSCI  Emerging  Markets  Free and
returns.


[mountain chart]
PERFORMANCE OF $10,000 OVER LIFE OF FUND

VALUE ON 5/31/98
Emerging Markets                   $8,500
MSCI EMF Index                     $7,476

             EMERGING MARKETS              EMF
DATE            ACCT VALUE             ACCT VALUE
9/30/97           $10,000               $10,000
10/31/97           $8,480                $8,359
11/30/97           $8,300                $8,054
12/31/97           $8,360                $8,248
1/31/98            $7,800                $7,601
2/28/98            $8,700                $8,395
3/31/98            $9,060                $8,759
4/30/98            $9,400                $8,664
5/31/98            $8,500                $7,476


The chart at left  shows the  performance  of a $10,000  investment  in the fund
since  inception.  MSCI Emerging  Markets Free is provided for comparison.  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.  Emerging  Markets'  total return  includes  operating  expenses  (such as
transaction  costs and  management  fees) that reduce  returns,  while the total
return of the MSCI Emerging Markets Free Index does not.


22   1-800-345-2021


Emerging Markets--Q&A
- --------------------------------------------------------------------------------

     An interview with Mark Kopinski and Michael Donnelly, portfolio managers on
the Emerging Markets fund team.

HOW DID EMERGING MARKETS PERFORM FOR THE SIX MONTHS ENDED MAY 31, 1998?

     The fund  held its own in a very  difficult  investment  environment.  Many
emerging  markets  continued  to suffer the effects of the economic and currency
crises that rocked  Southeast Asia in late 1997. As a result,  returns have been
weak on an absolute  basis,  but relative to our  benchmark and mutual fund peer
group, Emerging Markets performed well. The fund posted a 2.41% gain for the six
months, versus a decline of 7.17% for its benchmark, the Morgan Stanley Emerging
Markets Free Index.  According to Lipper  Analytical  Services,  an  independent
company that ranks mutual funds, the fund was in the top 7% of its peer group of
156  emerging  markets  funds.  Its Lipper  peers  posted an  average  return of
- -6.09%.*

     Emerging Markets'  favorable  relative  performance was driven primarily by
good stock  selection  in markets that had  positive  momentum.  We were able to
sidestep a number of "potholes" by focusing on the earnings growth of individual
companies,  a strategy that moved us away from troubled areas and toward growing
companies in countries with healthier, more robust prospects.

WHAT EXPLAINS EMERGING MARKETS' BETTER PERFORMANCE RELATIVE TO ITS BENCHMARK AND
PEER GROUP?

     The most significant  factor is the fund's  relatively low exposure to some
countries  that are  heavily  represented  in the index,  such as  Malaysia  and
Taiwan, which were adversely affected by the collapse of the Asian economies. We
wish to stress that although we pay close attention to macro factors,  such as a
country's  economic  health and  political  stability,  we select stocks using a
bottom-up  approach.  In other words,  investments are made on a  stock-by-stock
basis, and not solely by country allocation.

     We did stake out a modest  position in some  companies  in Asia when prices
were  much  lower  than a year  ago.  Those  investments  were  concentrated  in
companies  that  continue  to  demonstrate   good  growth   patterns,   such  as
export-oriented  companies,  or domestic companies that we thought would survive
the crisis on the basis of their fundamental stability and operating prospects.

IN WHICH COUNTRIES AND SECTORS HAVE YOU FOUND THE GREATEST GROWTH?

     Worldwide,  we found  earnings  growth in companies  in software  services,
banking and cellular  service  providers.  There is a vast array of fast-growing
software companies located in emerging market countries.  Many of these are high
quality  firms that  supply  first-rate  services  and are  heavily  involved in
network integration and in solving Year 2000 programming  problems.  We also had
success in banks  with  strong  franchises  and  expanding  product  lines.  The
penetration of sophisticated banking and financial services is occurring in many
markets  around the globe.  Cellular  service  providers  was another group that
continued to post much  stronger  than expected  subscriber  growth,  which is a
catalyst for revenue and earnings acceleration. Analysts were repeatedly

*Lipper rankings are based on average annual total returns. Past performance is
no guarantee of future results.


[right margin]

PORTFOLIO AT A GLANCE
                                                 5/31/98          11/30/97

NO. OF COMPANIES                                  109               113

MEDIAN MARKET                                    $769              $894
CAPITALIZATION                                  MILLION           MILLION

PORTFOLIO TURNOVER                              143%(1)           36%(2)

EXPENSE RATIO                                  2.00%(3)          2.00%(3)

"Worldwide, we found earnings growth in companies in software services, banking
and cellular service providers. There is  a vast array of  fast-growing software
companies located in emerging market  countries."

(1)       Six months ended 5/31/98.
(2)       For the period from 9/30/97 to 11/30/97.
(3)       Annualized.

Investment terms are defined in the Glossary on page 47.

                                               www.americancentury.com    23


Emerging Markets--Q&A (continued)
- --------------------------------------------------------------------------------

surprised by expanding  penetration  rates, not only in developed  economies but
also in the emerging markets where we invest.

WHICH STOCKS CONTRIBUTED THE MOST  TO RETURNS?

     Two  of  Emerging   Market's  top   performers,   Wipro  Ltd.  and  Infosys
Technologies,  Ltd.,  are  computer  software  companies  based in  India.  Both
companies have strong client  relationships  in Europe and the United States and
are enjoying robust sales of software  products that help companies address Year
2000 programming  issues.  Two primary factors are driving that success.  First,
costs in India are  relatively  low, so these  companies can offer  high-quality
products  and  services at  relatively  inexpensive  prices  compared to U.S. or
European software companies.  Second, because they are located in different time
zones than their  Western  customers,  Wipro and Infosys can provide  service to
European and American companies during their non-business hours. Many of Wipro's
and Infosys's  largest  customers are banks and financial service companies that
are  updating  their  computer  systems to be Year 2000  compliant.  Advances in
telecommunication  and computer  technologies  allow for  off-site  analysis and
upgrades of computer code.

     A third Indian company, Pentafour Software, also helped boost returns. Like
Wipro and Infosys,  Pentafour's  profits  stem largely from its strong  business
ties to U.S.  companies.  Pentafour  stands  to  benefit  additionally  from its
ability to do  three-dimensional  computer modeling,  which is used in the media
industry.

     Other  top-performing  stocks included Hellenic  Bottling Company,  a Greek
bottler of Coca-Cola,  fruit juices and mineral water, and Telemig  Cellular,  a
cellular services provider in Southeastern Brazil.

WHICH SECTORS OR STOCKS HURT  PERFORMANCE?

     Securities in the oil sector were weak. Many of these companies are located
in Asia and, although we felt earnings would be relatively  stable,  falling oil
prices  proved  to be a  large  negative  factor.  Names  such as  Medco  Energi
Corporation  in Malaysia  and Gulf  Indonesia  Resources  in  Indonesia  did not
provide  safe  havens  for  investment,  despite  relatively  positive  earnings
momentum.

     Utilities outside of Asia also suffered. At the beginning of the period, we
were optimistic that Brazil's move toward  privatization would bode well for its
utility  sector,  and that the Brazilian  government  would sell off its utility
holdings  quickly and  profitably to the private  sector.  Because of the global
emerging  markets  turmoil,  the process was set back, and that took many of our
Brazilian utilities holdings down substantially.

WHAT CHANGES DID YOU MAKE TO THE PORTFOLIO DURING THE PERIOD?

     As we discussed earlier, we were drawn to rapidly growing computer software
companies in India and increased holdings there to 8.9% of investments. When the
period began, Emerging Markets did not hold any Indian companies.  We also found
accelerating  growth in exporters and financial services in Greece and increased
portfolio  holdings from 1.9% of investments  to 9.6%. In South Africa,  banking
and financial services demonstrated rapid acceleration,  and holdings there rose
from 4.7% to 9.2% of investments. Brazil and Greece now represent


[left margin]

TOP TEN HOLDINGS
                                    % OF FUND INVESTMENTS
                                  AS OF               AS OF
                                 5/31/98            11/30/97

MAILLIS                           2.4%                 --
PENTAFOUR SOFTWARE
     & EXPORTS LTD.               2.4%                 --
FOLLI-FOLLIE ABEE                 2.1%                 --
BELL CANADA
     INTERNATIONAL INC.           2.0%                1.1%
SUN BREWING
     LTD. GDR                     1.9%                0.9%
OY HARTWALL AB                    1.8%                1.4%
ELEKTRIM SPOLKA
     AKCYJNA S.A.                 1.8%                 --
MELIA INVERSIONES
     AMERICANAS, N.V.             1.8%                 --
SOUTH AFRICAN
     BREWERIES LTD.               1.8%                 --
PERSETEL Q DATA
     HOLDINGS LTD.                1.8%                 --


TOP FIVE INDUSTRIES
                                    % OF FUND INVESTMENTS
                                  AS OF               AS OF
                                 5/31/98            11/30/97

COMMUNICATIONS
     SERVICES                    13.5%               14.7%
BANKING                          12.3%                5.7%
FOOD & BEVERAGE                  12.0%                8.2%
RETAIL (GENERAL
     MERCHANDISE)                 8.2%                1.7%
ELECTRICAL & ELECTRONIC
     COMPONENTS                   5.7%                2.1%


24   1-800-345-2021


Emerging Markets--Q&A (continued)
- --------------------------------------------------------------------------------

Emerging Market's heaviest  geographical  concentrations.  Positions in food and
beverage  stocks  grew from 8.2% of  investments  to 12%,  and  retail  (general
merchandise) stocks moved up from 1.7% to 8.2%. These groups are doing well in a
number of markets.

     On the sell side,  we reduced  Emerging  Markets'  weighting  in  countries
heavily dependent on oil revenues,  such as Mexico.  When oil trends down, as it
has over the last  six  months,  economic  growth  slows  and  company  earnings
decelerate.  As a result,  holdings in Mexico dropped from 6.9% to 4.4%, a level
significantly lower than that held by our benchmark index.

WHAT IS YOUR OUTLOOK FOR THE WORLD'S EMERGING MARKETS GOING FORWARD?

     We continue to be excited about the  opportunities we see in markets across
the globe. The long-standing  criticism of emerging markets is that their growth
is  typically  limited  to banks,  breweries  and cement  companies,  but we are
finding other growth  industries.  For example,  we've observed that  industries
demonstrating  growth  in the U.S.  or in other  developed  countries  are often
having  similar  success in emerging  markets.  As we stated  earlier,  software
service  companies,  for  example,  are doing well both here and abroad,  as are
financial  services  companies  and  cellular  service  providers.  Our earnings
methodology  has  pointed us to these and other  opportunities  that lie outside
typical  emerging  market  growth  areas.  A good  example  of such a  stock  is
Folli-Follie,  a manufacturer of designer  jewelry in Greece.  The company makes
high-quality jewelry that retails from $100 to $2,500.  Folli-Follie is enjoying
success in the United States,  Europe and in Greece,  its primary market, and is
doing especially well in Japan,  where its first-quarter 1998 sales were up 100%
over the previous  year's first  quarter.  This is a classic  growth stock:  The
company  is  doing  a  great  job  establishing  itself  as  a  brand  name,  is
demonstrating rapid acceleration in earnings and revenues, and we believe it has
excellent potential for growth going forward. This is exactly what we're looking
for -- and  continuing  to find -- in a number of  emerging  markets  around the
world.


[pie charts]

TYPES OF INVESTMENTS IN  THE PORTFOLIO

AS OF MAY 31, 1998
Repurchase Agreements       3.9%
Preferred Stocks            8.2%
Common Stocks & Rights     87.9%

AS OF NOVEMBER 30, 1997
Preferred Stocks            9.8%
Repurchase Agreements      11.0%
Common Stocks & Rights     79.2%

[bar chart]
EMERGING MARKETS' INVESTMENTS BY COUNTRY

                 5/31/98                 11/30/97
Brazil            11.2%                   11.7%
Greece             9.6%                    1.9%
South Africa       9.2%                    4.7%
India              8.9%                    0.0%
Portugal           6.5%                    5.6%
Poland             5.4%                    3.4%
Finland            4.8%                    3.0%
Mexico             4.4%                    6.9%
Turkey             3.9%                    1.7%
Other             36.1%                   61.1%


                                                      www.americancentury.com 25


Emerging Markets--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

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

COMMON STOCKS & RIGHTS

ARGENTINA--3.4%

         35,000  IRSA Inversiones y
                   representaciones S.A. Cl B                 $  123,954
                   (real estate)

         10,000  Mirgor S.A. C.I.F.I.A. Cl C                     280,122
                   (automobiles & auto parts)

         50,000  Renault Argentina S.A.                          103,545
                   (automobiles & auto parts)

         49,000  Siderar S.A.I.C. Cl A                           200,987
                   (steel)                           -------------------------

                                                                 708,608
                                                     -------------------------

BRAZIL--3.0%

        750,000  Companhia de Saneamento
                    Basico do Estado de Sao Paulo                127,146
                   (utilities)

        800,000  Light - Servicos de Eletricidade S/A            281,678
                   (utilities)

      2,000,000  Telecomunicacoes Brasileiras S.A.               168,659
                   (communications services)

            500  Telecomunicacoes
                   Brasileiras S.A. ADR                           53,313
                  (communications services)          -------------------------

                                                                 630,796
                                                     -------------------------

CANADA--2.2%

         16,500  Bell Canada International Inc.(1)               423,844
                   (communications services)

         29,297  Sedna Geotech, Inc.(1)                           22,130
                   (metals & mining)                 -------------------------

                                                                 445,974
                                                     -------------------------

CHILE--1.2%

         10,000  Compania Cervecerias
                   Unidas S.A. ADR                               240,938
                   (food & beverage)                 -------------------------

CROATIA--1.4%

         18,000  Pliva d.d. GDR                                  296,100
                   (pharmaceuticals)                 -------------------------



CZECH REPUBLIC--2.6%

          1,246  Cokoladovny a.s.(1)                             220,654
                   (food & beverage)

          1,509  Prazska Energetika a.s.(1)                       86,792
                   (utilities)

            800  SPT Telecom a.s.(1)                             102,682
                   (communications services)

          1,668  Stredoceska Energetika a.s.(1)                   71,701
                   (utilities)

          1,405  Vychodoceska Energetika (VCE)(1)                 57,546
                   (utilities)                       -------------------------

                                                                 539,375
                                                     -------------------------


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

FINLAND--4.8%

         20,000  Elcoteq Network Corp. Cl A                   $  254,350
                   (electrical & electronic
                   components)

          7,000  Nokian Renkaat Oyj                              352,219
                   (rubber & plastics)

         13,000  OY Hartwall AB                                  377,378
                   (food & beverage)                 -------------------------

                                                                 983,947
                                                     -------------------------

GREECE--9.6%

          2,000  Alpha Credit Bank                               208,540
                   (banking)

         10,000  Chipita International S.A.                      288,591
                   (food & beverage)

          3,000  Ergo Bank S.A.                                  272,423
                   (banking)

         14,000  Folli-Follie Abee(1)                            445,348
                   (retail-general merchandise)

          8,900  Hellenic Telecommunication
                   Organization SA (OTE)                         261,224
                   (communications services)

         23,000  Maillis                                         504,985
                    (retail-general merchandise)     -------------------------

                                                               1,981,111
                                                     -------------------------

HONG KONG--1.5%

        250,000  Cafe De Coral Holdings                           77,429
                   (food & beverage)

          7,000  Peak International Ltd.(1)                      112,219
                   (packaging & containers)

        305,000  Qingling Motors Company                         120,048
                   (automobiles & auto parts)        -------------------------

                                                                 309,696
                                                     -------------------------

HUNGARY--1.8%

          6,000  Magyar Tavkozlesi Rt. ADR(1)                    168,000
                   (communications services)

          4,000  Mezogazdasagi Gepgyarto
                   Reszvenytarsasag(1)                            89,759
                   (automobiles & auto parts)

          4,500  MOL Magyar Olaj-es Gazipari Rt.                 102,978
                   (energy-services)                 -------------------------

                                                                 360,737
                                                     -------------------------

INDIA--8.9%

         36,000  Corporation Bank(1)                             101,215
                   (banking)

          8,000  Hero Honda Motors Ltd.                          207,827
                   (leisure)

          5,000  Infosys Technologies Ltd.                       292,407
                   (electrical & electronic
                   components)

         20,000  Larsen & Toubro Ltd.                            122,785
                   (diversified companies)

         11,000  Nicholas Piramal Limited                        109,604
                   (pharmaceuticals)


See Notes to Financial Statements


26   1-800-345-2021


Emerging Markets--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

         20,000  Pentafour Software & Exports Ltd.            $  502,041
                   (computer software & services)

          9,000  Ranbaxy Laboratories Ltd.                       126,681
                   (pharmaceuticals)

         10,000  SmithKline Beecham Consumer
                   Healthcare Ltd.                              104,082
                   (pharmaceuticals)

          6,450  Wipro Limited                                   284,907
                   (computer peripherals)           -------------------------

                                                               1,851,549
                                                     -------------------------

INDONESIA--0.7%

        900,000  PT Indah Kiat Pulp & Paper
                   Corporation Tbk                               147,345
                   (paper & forest products)         -------------------------

ISRAEL--1.7%

         75,000  Bank Hapoalim Ltd.                              230,501
                   (banking)

         15,000  Oshap Technologies, Ltd.(1)                     125,156
                   (computer software & services)    -------------------------

                                                                 355,657
                                                     -------------------------

LATVIA--0.5%

         25,000  Latvijas Unibanka GDR                           106,875
                   (banking)                         --------------------------

MALAYSIA--0.6%

        165,000  Puncak Niaga Holding Berhad(1)                  131,561
                   (construction & property          ---------------------------
                   development)

MEXICO--4.4%

         45,000  ARA, S.A. de C.V.(1)                            179,460
                   (construction & property
                   development)

        409,137  Biper, S.A. de C.V. Series B(1)                 190,975
                   (communications services)

         21,000  Cemex SA de CV Cl B(1)                          103,019
                   (building & home improvements)

         35,000  Cemex SA de CV Cl B Rights(1)                       365
                   (building & home improvements)

          6,000  Coca-Cola FEMSA, S.A.
                   de C.V. ADR(1)                                102,000
                   (food & beverage)

         55,000  Corporacion Interamericana de
                   Entretenimiento S.A. Cl B(1)                  185,691
                   (leisure)

          4,533  Corporacion Interamericana de
                   Entretenimiento S.A. Cl L(1)                   14,277
                   (leisure)

          4,000  Fomento Economico Mexica UBD                    132,737
                   (food & beverage)                 -------------------------

                                                                 908,524
                                                     -------------------------

PERU--1.2%

        160,993  Cementos Norte Pacasmayo S.A.                   257,836
                   (construction & property          --------------------------
                    development)

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

PHILIPPINES--3.0%

      1,300,000  International Container Terminal
                   Services, Inc.(1)                          $  186,189
                  (transportation)

         10,000  Philippine Long Distance
                   Telephone Company ADR                         253,750
                  (communications services)

        360,000  Security Bank Corp.(1)                          177,238
                   (banking)                         -------------------------

                                                                 617,177
                                                     -------------------------

POLAND--5.4%

         23,000  Bank Ochrony Srodowiska S.A.                    275,394
                   (banking)

         28,400  Elektrim Spolka Akcyjna S.A.                    373,406
                   (electrical & electronic
                   components)

         12,000  Kredyt Bank S.A. GDR
                   (Aquired 12/11/97-1/28/98,
                   Cost $144,393)(1)(2)                          204,600
                   (banking)

         23,000  Softbank S.A. GDR(1)                            258,750
                   (electrical & electronic           -------------------------

components)

                                                               1,112,150
 .                                                     -------------------------

PORTUGAL--6.5%

          6,750  Banco Espirito Santo e
                   Comercial de Lisboa, SA                       237,265
                   (banking)

          6,000  Banco Espirito Santo e
                   Comercial de Lisboa, SA Rights(1)              42,180
                   (banking)

          8,000  Cimpor-Cimentos de Portugal,
                   SGPS, SA                                      305,960
                   (building & home improvements)

         10,000  EDP-Electricidade de Portugal, S.A.             262,438
                   (utilities)

          8,000  Espirito Santo Financial
                   Holding S.A. ADR                              203,500
                  (banking)

          1,700  Telecel-Comunicacaoes
                   Pessoais, SA(1)                               297,430
                  (communications services)          -------------------------

                                                               1,348,773
                                                     -------------------------

RUSSIAN FEDERATION--3.9%

         29,000  SUN Brewing Ltd. GDR(1)                         385,042
                   (food & beverage)

         10,000  Unified Energy Systems GDR(1)                   178,750
                   (energy-services)

          5,000  Vimpel-Communications ADR(1)                    242,188
                   (communications services)         -------------------------

                                                                 805,980
                                                     -------------------------

See Notes to Financial Statements

                                                      www.americancentury.com 27


Emerging Markets--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)

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

SOUTH AFRICA--9.2%

          7,000  Ellerine Holdings Limited                    $   59,878
                   (retail-general merchandise)

          8,000  Fedsure Holdings Limited                        123,208
                   (insurance)

         68,000  Foschini Limited(1)                             250,606
                   (retail-general merchandise)

          2,000  Investec Holdings Limited                        93,570
                   (financial services)

          4,000  Liberty Life Association of Africa Ltd.         110,949
                   (insurance)

          3,000  Nedcor Limited                                   80,303
                   (banking)

         35,000  Persetel Q Data Holdings Ltd.                   366,599
                   (computer software & services)

         26,000  Primedia Limited Cl N                           206,769
                   (broadcasting & media)

         55,000  Real Africa Holdings Limited(1)                 248,569
                   (insurance)

         13,000  South African Breweries Ltd.                    366,638
                   (food & beverage)                 -------------------------

                                                               1,907,089
                                                     -------------------------

SOUTH KOREA--0.4%

          8,000  Korea Electric Power Corp.                       80,142
                   (utilities)                       --------------------------

SPAIN--1.8%

          7,700  Melia Inversiones Americanas, N.V.(1)           371,115
                   (hotels)                          --------------------------

SRI LANKA--1.4%

         30,000  John Keells Holdings Ltd.                       115,500
                   (food & beverage)

        189,700  Maskeliya Plantation Ltd.(1)                    180,945
                   (food & beverage)                 -------------------------

                                                                 296,445
                                                     -------------------------

TAIWAN (PEOPLE'S REPUBLIC OF CHINA)--1.2%

         14,000  Asustek Computer Inc.(1)                        257,250
                   (computer peripherals)            -------------------------

THAILAND--1.1%

         35,000  Compass East Industry Public
                   Company Limited                               232,236
                  (retail-general merchandise)       -------------------------



TUNISIA--0.6%

         10,000  Banque Internationale Arabe
                   Tunisie GDR(1)                                116,500
                   (banking)                         --------------------------

TURKEY--3.9%

      3,200,000  Akbank T.A.S.                                    94,147
                   (banking)

      2,800,000  Aksigorta A.S.                                  170,718
                   (insurance)

        200,000  Carsi Buyuk Magazacilik A.S.                    106,457
                   (retail-general merchandise)

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

      2,500,000  Dogan Sirketler Grubu
                   Holding A.S.(1)                            $  147,588
                  (printing & publishing)

      2,884,500  Turkiye Is Bankasi(1)                           117,247
                   (banking)

      1,923,000  Turkiye Is Bankasi Cl C                          78,165
                   (banking)

      2,370,000  Yapi Kredi Yatirim Ortaligi A.S.(1)              45,873
                   (financial services)

      3,000,000  Yapi ve Kredi Bankasi A.S.                       58,067
                   (financial services)              -------------------------

                                                                 818,262
                                                     -------------------------

TOTAL COMMON STOCKS & RIGHTS--87.9%                           18,219,748
   (Cost $17,368,716)                                -------------------------


PREFERRED STOCKS

BRAZIL--8.2%

     10,000,000  Banco Bradesco S.A.                              81,721
                   (financial services)

        350,000  Banco Itau S.A.                                 208,436
                   (banking)

      3,671,310  Cia Energetica de Minas Gerais                  121,287
                   (utilities)

        400,000  Companhia de Tecidos
                    Norte de Minas                                67,811
                   (textiles & apparel)

         12,000  Globex Utilidades S.A.                           93,893
                   (retail-general merchandise)

       700,000  Petroleo Brasileiro S/A                          135,101
                   (energy-production & marketing)

      2,750,000  Telecomunicacoes de Minas Gerais                277,331
                   (communications services)

      2,800,000  Telecomunicacoes do
                    Rio de Janeiro S.A.                          233,688
                   (communications services)

        460,000  Telecomunicacoes de Sao Paulo S.A.               98,379
                   (communications services)

      2,750,000  Telemig Celular S.A. Cl C (1)                   129,341
                   (communications equipment)

      2,300,000  Telerj Celular S.A. Cl B (1)                    167,963
                   (communications equipment)

        900,000  Telesp Celular S.A. Cl B(1)                      82,938
                   (communications equipment)        -------------------------

TOTAL PREFERRED STOCKS--8.2%                                   1,697,889
   (Cost $1,167,318)                                 -------------------------

See Notes to Financial Statements


28   1-800-345-2021


Emerging Markets--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                  (Continued)

MAY 31, 1998 (UNAUDITED)


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

TEMPORARY CASH INVESTMENTS--3.9%

    Repurchase Agreement, State Street Bank
      & Trust Co., 5.48%, due 6/1/98, collateralized
      by $800,000 par value U.S. Treasury
      Notes, 5.625%, due 12/31/02
     (Delivery value $800,365)                             $     800,000
   (Cost $800,000)                                   -------------------------

TOTAL INVESTMENT SECURITIES--100.0%                          $20,717,637
   (Cost $19,336,034)                                =========================

NOTES TO SCHEDULE OF INVESTMENTS

ADR = American Depositary Receipt
GDR = Global Depositary Receipt
(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, 1998 was $204,600 which represented 0.9% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  shows  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

*    the percentage of total investments in each country

*    a list of each investment

*    the number of shares of each stock

*    the market value of each investment

*    the percent and dollar breakdown of each investment category

See Notes to Financial Statements

                                                      www.americancentury.com 29


<TABLE>
<CAPTION>
Statements of Assets and Liabilities
- --------------------------------------------------------------------------------

                                                                       INTERNATIONAL   INTERNATIONAL      EMERGING
                                                                           GROWTH        DISCOVERY        MARKETS

MAY 31, 1998 (UNAUDITED)

ASSETS
<S>                                                                       <C>               <C>              <C>    
Investment securities, at value (identified cost of $1,833,064,370,
  $623,138,379 and $19,336,034, respectively) (Note 3) ............  $2,454,994,159    $912,604,264      $20,717,637

Foreign currency holdings, at value (identified cost
  of $0, $3,078,005, and $555,219, respectively) ..................            --         3,048,323          551,980

Cash ..............................................................       1,204,945         868,371          111,377

Receivable for forward foreign currency exchange contracts ........       1,173,591         404,408             --

Receivable for investments sold ...................................      14,312,145      18,029,311          882,361

Receivable for capital shares sold ................................      16,738,201            --               --

Dividends and interest receivable .................................       9,704,087       1,526,707          113,910
                                                                      -------------     -----------       ----------
                                                                      2,498,127,128     936,481,384       22,377,265
                                                                      -------------     -----------       ----------

LIABILITIES

Disbursements in excess of demand deposit cash ....................       1,178,733         526,029             --

Payable for investments purchased .................................      52,686,924      23,835,591          767,610

Payable for capital shares redeemed ...............................      14,890,096         178,065             --

Accrued management fees (Note 2) ..................................       2,650,914       1,187,446           40,075

Distribution fees payable (Note 2) ................................           2,974               2             --

Service fees payable (Note 2) .....................................           2,974               2             --

Other liabilities .................................................           2,775             707               20
                                                                      -------------     -----------       ----------
                                                                         71,415,390      25,727,842          807,705
                                                                      -------------     -----------       ----------

Net Assets ........................................................  $2,426,711,738  $  910,753,542   $   21,569,560
                                                                     ==============  ==============   ==============

NET ASSETS CONSIST OF:

Capital (par value and paid in surplus) ...........................  $1,758,786,953  $  607,660,834   $   22,513,267

Undistributed net investment income (loss) ........................       7,450,223        (606,003)          29,138

Accumulated undistributed net realized gain (loss) from
investments and foreign currency transactions .....................      37,403,660      14,421,350       (2,169,599)

Net unrealized appreciation on investments and translation
  of assets and liabilities in foreign currencies (Note 3) ........     623,070,902     289,277,361        1,196,754
                                                                      -------------     -----------       ----------

                                                                     $2,426,711,738  $  910,753,542   $   21,569,560
                                                                     ==============  ==============   ==============

Investor Class, $0.01 Par Value

Net assets ........................................................  $2,387,496,813  $  848,554,430   $   21,569,560

Shares outstanding ................................................     234,236,583      78,682,502        5,070,418

Net asset value per share .........................................  $        10.19  $        10.78   $         4.25

Advisor Class, $0.01 Par Value

Net assets ........................................................  $   14,912,540  $       10,719              N/A

Shares outstanding ................................................       1,464,535             994              N/A

Net asset value per share .........................................  $        10.18  $        10.78              N/A

Institutional Class, $0.01 Par Value

Net assets ........................................................  $   24,302,385  $   62,188,393              N/A

Shares outstanding ................................................       2,381,464       5,766,193              N/A

Net asset value per share .........................................  $        10.20  $        10.79              N/A
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns,  you get the fund's net assets.  For each class of shares,  the net assets
divided  by the total  number of  shares  outstanding  gives you the price of an
individual share, or the net asset value per share.

NET ASSETS are also broken out by capital (money invested by shareholders);  net
investment  income not yet paid to  shareholders or net investment  losses;  net
gains  earned on  investments  not yet paid to  shareholders  or net losses from
investments (known as realized gains or losses), and finally, gains or losses on
securities  still  owned  by the  fund  (known  as  unrealized  appreciation  or
depreciation).  This  breakout  tells  you the  value  of net  assets  that  are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


30   1-800-345-2021


<TABLE>
<CAPTION>
Statements of Operations
- --------------------------------------------------------------------------------

                                                                 INTERNATIONAL    INTERNATIONAL      EMERGING
                                                                     GROWTH         DISCOVERY        MARKETS

FOR THE SIX MONTHS ENDED MAY 31, 1998 (UNAUDITED)

INVESTMENT INCOME (LOSS)

Income:
<S>                                                                  <C>               <C>              <C>   
Dividends (net of foreign taxes withheld of
  $2,893,442, $726,903, and $30,713, respectively) ............  $  18,966,297   $   4,915,748   $     205,180

Interest ......................................................      2,290,040         462,780          16,076
                                                                    ----------       ---------         -------
                                                                    21,256,337       5,378,528         221,256
                                                                    ----------       ---------         -------

Expenses (Note 2):

Management fees ...............................................     13,710,211       5,893,431         192,020

Distribution fees -- Advisor Class ............................         14,204               2            --

Service fees -- Advisor Class .................................         14,204               2            --

Directors' fees and expenses ..................................         10,780           3,746              98
                                                                    ----------       ---------         -------

                                                                    13,749,399       5,897,181         192,118
                                                                    ----------       ---------         -------

Net investment income (loss) ..................................      7,506,938        (518,653)         29,138
                                                                    ----------       ---------         -------


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

Net realized gain (loss) on:

Investments ...................................................     81,526,308      27,176,527        (938,311)

Foreign currency transactions .................................    (26,085,585)     (7,536,863)       (483,718)
                                                                    ----------       ---------         -------

                                                                    55,440,723      19,639,664      (1,422,029)
                                                                    ----------       ---------         -------

Change in net unrealized appreciation (depreciation) on:

Investments ...................................................    461,177,043     197,001,956       2,348,634

Translation of assets and liabilities in foreign currencies ...     (6,722,544)     (2,827,968)       (153,190)
                                                                    ----------       ---------         -------

                                                                   454,454,499     194,173,988       2,195,444
                                                                   -----------     -----------       ---------


Net realized and unrealized gain
  on investments and foreign currency .........................    509,895,222     213,813,652         773,415
                                                                   -----------     -----------         -------


Net Increase in Net Assets Resulting from Operations ..........  $ 517,402,160   $ 213,294,999   $     802,553
                                                                 =============   =============   =============
</TABLE>


- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks out how each
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income, fees and expenses, and investment gains or losses.

It does not include shareholder transactions and distributions.

Fund OPERATIONS include:

* income earned by investments (dividends and interest)

* management fees and expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized  appreciation or
  depreciation)

See Notes to Financial Statements


                                                      www.americancentury.com 31


<TABLE>
<CAPTION>
Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED MAY 31, 1998 (UNAUDITED) AND THE YEAR ENDED NOVEMBER 30, 1997

                                      INTERNATIONAL GROWTH             INTERNATIONAL DISCOVERY               EMERGING MARKETS
                                     1998             1997              1998            1997              1998           1997(1)
Increase in Net Assets

OPERATIONS

Net investment
<S>                            <C>              <C>              <C>              <C>              <C>              <C>             
  income (loss) .............. $     7,506,938  $       468,044  $      (518,653) $    (2,060,141) $        29,138  $       (12,297)

Net realized gain
  (loss) on investments
  and foreign currency
  transactions ...............      55,440,723      229,010,260       19,639,664       32,550,517       (1,422,029)        (758,197)

Change in net unrealized
  appreciation (depreciation)
  on investments and
  translation of assets
  and liabilities
  in foreign currencies ......     454,454,499       18,520,872      194,173,988       47,358,619        2,195,444         (998,690)
                                   -----------       ----------      -----------       ----------        ---------         -------- 

Net increase (decrease)
  in net assets
  resulting from
  operations .................     517,402,160      247,999,176      213,294,999       77,848,995          802,553       (1,769,184)
                                   -----------      -----------      -----------       ----------          -------       ---------- 

DISTRIBUTIONS TO SHAREHOLDERS

From net investment income:

  Investor Class .............      (5,226,555)          (5,636)      (1,491,375)        (862,734)            --               --
  Advisor Class ..............          (5,388)            --               --               --               --               --
  Institutional Class ........         (57,980)            --               --               --               --               --

From net realized gains
  on investment
  transactions:

  Investor Class .............    (237,084,033)    (140,384,782)     (33,708,327)     (16,063,439)            --               --
  Advisor Class ..............      (1,325,086)        (405,850)            --               --               --               --
  Institutional Class ........      (2,488,279)            --               --               --               --               --
                                   -----------      -----------      -----------       ----------          -------       ---------- 

Decrease in net
  assets from distributions ..    (246,187,321)    (140,796,268)     (35,199,702)     (16,926,173)            --               --
                                   -----------      -----------      -----------       ----------          -------       ---------- 

CAPITAL SHARE TRANSACTIONS (NOTE 4)

Net increase in net
  assets from
  capital share
  transactions ...............     398,922,550      302,960,946      106,331,645      188,275,387        8,937,492       13,598,699
                                   -----------      -----------      -----------      -----------        ---------       ----------

Net increase
  in net assets ..............     670,137,389      410,163,854      284,426,942      249,198,209        9,740,045       11,829,515


NET ASSETS

Beginning of period ..........   1,756,574,349    1,346,410,495      626,326,600      377,128,391       11,829,515             --
                                 -------------    -------------      -----------      -----------       ----------       ----------

End of period ................ $ 2,426,711,738  $ 1,756,574,349  $   910,753,542  $   626,326,600  $    21,569,560  $    11,829,515
                               ===============  ===============  ===============  ===============  ===============  ===============

Undistributed net
investment income (loss) ..... $     7,450,233  $     5,233,208  $      (606,003) $     1,404,025  $        29,138             --
                               ===============  ===============  ===============  ===============  ===============  ===============
</TABLE>

(1) September 30, 1997 (inception) through November 30, 1997.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF CHANGES IN NET ASSETS--This  statement shows how
each fund's net assets changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

*    operations--a summary of the Statement of Operations from the previous page
     for the most recent period

*    distributions--income and gains distributed to shareholders

*    share transactions--shareholders'  purchases, reinvestment of distributions
     and redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


32   1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1998 (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  company.  Three series of funds are currently issued as
American  Century--Twentieth  Century  International  Growth Fund (International
Growth),  American   Century--Twentieth  Century  International  Discovery  Fund
(International  Discovery),  and American  Century--Twentieth  Century  Emerging
Markets Fund (Emerging Markets) (the Funds). The Funds' investment  objective is
to  seek   capital   growth  by  investing   primarily  in  equity   securities.
International  Growth seeks to achieve its investment  objective by investing in
securities of issuers in developed  markets.  International  Discovery  seeks to
achieve its investment  objective by investing in issuers  having  comparatively
smaller market capitalizations. Emerging Markets seeks to achieve its investment
objective  by investing in issuers in emerging  market  countries.  Each Fund is
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 net 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  Advisor  Class  and
Institutional Class for International  Discovery commenced on April 28, 1998 and
January 2, 1998, respectively. Sale of the Advisor Class and Institutional Class
for  Emerging  Markets  had not  commenced  as of May 31,  1998.  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 as of the
trade date. 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 accretion of discounts and amortization of 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
investment 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 investment
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 investment  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 Fund's  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   advisor,   American  Century
Investment Management, Inc. (ACIM), has determined are creditworthy pursuant to


                                                   www.americancentury.com   33


Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

criteria  adopted  by the  Board of  Directors.  Each  repurchase  agreement  is
recorded  at cost.  The  Funds  require  that  the  collateral,  represented  by
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
greater than amounts owed to the Funds under each repurchase agreement.

     INCOME TAX STATUS -- It is the  policy of the Funds to  distribute  all net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state 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.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

     At November 30, 1997, Emerging Markets had accumulated net realized capital
loss  carryovers for federal income tax purposes of $591,349  (expiring in 2005)
which may be used to offset future taxable gains.

     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 period.  Actual results could differ from
these estimates.

     ADDITIONAL   INFORMATION   --  Funds   Distributor,   Inc.   (FDI)  is  the
Corporation's  distributor.  Certain  officers  of FDI are also  officers of the
Corporation.

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

     The  Corporation  has entered  into  Management  Agreements  with ACIM that
provide 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 class's average daily closing net assets during the previous month.

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

                              INVESTOR       ADVISOR     INSTITUTIONAL
                               CLASS          CLASS          CLASS
AVERAGE NET ASSETS
First $1 billion .............  1.50%         1.25%          1.30%
Of the next $1 billion .......  1.20%         0.95%          1.00%
Over $2 billion ..............  1.10%         0.85%          0.90%

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

                              INVESTOR       ADVISOR     INSTITUTIONAL
                               CLASS          CLASS          CLASS
AVERAGE NET ASSETS
First $500 million ........... 1.75%          1.50%          1.55%
Of the next $500 million ..... 1.40%          1.15%          1.20%
Over $1 billion .............. 1.20%          0.95%          1.00%


34   1-800-345-2021


Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

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

   The annual  management fee for the Investor  Class of Emerging  Markets is as
follows:

                                                              INVESTOR CLASS
AVERAGE NET ASSETS
First $500 million ............................................    2.00%
Of the next $500 million ......................................    1.50%
Over $1 billion ...............................................    1.25%

     The Board of Directors  has adopted the Advisor  Class Master  Distribution
and  Shareholder  Services  Plan  (the  Plan),  pursuant  to Rule  12b-1  of the
Investment  Company Act of 1940.  The 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  by  financial
intermediaries  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 respect to shares of
the  Funds.   The  service  fee  provides   compensation   for  shareholder  and
administrative  services  rendered by ACIM, its affiliates or independent  third
party  providers.  Fees incurred  under the Plan during the period ended May 31,
1998, were $28,408 and $4 for International Growth and International  Discovery,
respectively.

     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, and
the Corporation's transfer agent, American Century Services Corporation.

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

   Investment transactions, excluding short-term investments, for the six months
ended May 31, 1998, were as follows:

                             INTERNATIONAL    INTERNATIONAL    EMERGING
                                GROWTH          DISCOVERY      MARKETS

Purchases ................  $2,026,436,229    $711,484,059    $32,883,077

Proceeds From Sales ......  $1,880,814,861    $616,910,777    $25,992,419

    On May 31, 1998, the composition of unrealized appreciation and depreciation
of investment  securities based on the aggregate cost of investments for federal
income tax purposes was as follows:

                             INTERNATIONAL     INTERNATIONAL     EMERGING
                                GROWTH           DISCOVERY       MARKETS

Appreciation .............  $  637,790,549     $296,863,328    $ 2,336,358
Depreciation .............     (33,662,139)     (13,219,652)    (1,291,563)
                          -----------------------------------------------------
Net ......................  $  604,128,410     $283,643,676    $ 1,044,795
                          =====================================================
Federal Tax Cost .........  $1,850,865,749     $628,960,588    $19,672,842
                          =====================================================


                                                 www.americancentury.com   35


Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

- --------------------------------------------------------------------------------
4. CAPITAL SHARE TRANSACTIONS

    Transactions in shares of the Funds were as follows:

<TABLE>
                                    INTERNATIONAL GROWTH             INTERNATIONAL DISCOVERY         EMERGING MARKETS
                                   SHARES           AMOUNT            SHARES         AMOUNT       SHARES         AMOUNT

INVESTOR CLASS
<S>                             <C>             <C>                <C>            <C>             <C>          <C>         
Authorized shares ...............400,000,000                      100,000,000                    50,000,000
                                 ===========                      ===========                    ==========

Six months ended May 31, 1998

Sold ............................131,920,692    $1,221,036,075     16,797,468     $160,399,970    6,752,783    $ 28,226,286

Issued in reinvestment
  of distributions .............. 29,658,365       237,075,589      4,246,933       33,877,525            -              -

Redeemed .......................(114,847,558)   (1,066,202,708)   (15,708,400)    (141,548,602)  (4,533,507)    (19,288,794)
                                ------------    --------------    -----------     ------------   ----------     ----------- 

Net increase .................... 46,731,499     $ 391,908,956      5,336,001     $ 52,728,893    2,219,276    $  8,937,492
                                  ==========     =============      =========     ============    =========    ============


Year ended November 30, 1997(1)

Sold ............................139,809,145    $1,274,757,814     39,820,482     $327,139,130    3,580,134    $ 16,726,066

Issued in reinvestment
  of distributions .............. 17,809,533       137,887,292      2,369,407       16,757,464            -              -

Redeemed .......................(123,985,637)   (1,133,838,821)   (18,446,269)    (155,621,207)    (728,992)     (3,127,367)
                                ------------    --------------    -----------     ------------     --------      ---------- 

Net increase .................... 33,633,041     $ 278,806,285     23,743,620     $188,275,387    2,851,142    $ 13,598,699
                                  ==========     =============     ==========     ============    =========    ============

ADVISOR CLASS

Authorized shares ............... 170,000,000                      42,000,000
                                  ===========                      ==========

Period ended May 31, 1998(2)

Sold ............................     496,003       $4,715,742            994          $10,048

Issued in reinvestment
  of distributions ..............     166,517        1,330,469              -                -

Redeemed ........................    (188,566)      (1,687,771)             -                -
                                     ---------      -----------    ----------      -----------

Net increase ....................     473,954       $4,358,440            994          $10,048
                                      =======       ==========            ===          =======


Year ended November 30, 1997

Sold ............................    1,008,880      $9,379,963

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

Redeemed ........................     (506,709)     (4,696,551)
                                      --------      ---------- 

Net increase ....................      554,606      $5,089,262
                                       =======      ==========

INSTITUTIONAL CLASS

Authorized shares ...............   60,000,000                     16,000,000
                                    ==========                     ==========


Period ended May 31, 1998(3)

Sold ............................    1,762,423     $16,324,256      5,951,525      $55,573,193

Issued in reinvestment
  of distributions ..............      318,681       2,546,259              -                -

Redeemed ........................   (1,743,293)    (16,215,361)       (185,332)     (1,980,489)
                                    ----------     -----------        --------      ---------- 

Net increase ....................      337,811     $ 2,655,154       5,766,193     $53,592,704
                                       =======     ===========       =========     ===========

Period November 30, 1997(4)

Sold ............................    2,043,653     $19,065,399
                                     =========     ===========

(1)  September  30, 1997  (inception)  through  November  30, 1997 for  Emerging
     Markets.

(2)  December 1, 1997  through May 31, 1998 for  International  Growth and April
     28, 1998  (commencement  of sale)  through  May 31, 1998 for  International
     Discovery.

(3)  December 1, 1997 through May 31, 1998 for International  Growth and January
     2, 1998  (commencement  of sale)  through  May 31,  1998 for  International
     Discovery.

(4)  November 20, 1997 (commencement of sale) through November 30, 1998.


36   1-800-345-2021


Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------

MAY 31, 1998 (UNAUDITED)

5. AFFILIATED COMPANY TRANSACTIONS

   A summary of transactions  for each issuer which is or was an affiliate at or
during the six months ended May 31, 1998, follows:

                                   SHARE BALANCE     PURCHASE      SALES     REALIZED            MAY 31, 1998
FUND/ISSUER                        NOV. 30, 1997       COST         COST       LOSS      SHARE BALANCE   MARKET VALUE

INTERNATIONAL DISCOVERY

Oshap Technologies, Ltd.(1)           610,000        $323,421     $43,700   $(11,635)       636,200        $5,308,294
                                                  ======================================                ===============

(1) Security did not produce income during the period.
</TABLE>

                                                www.americancentury.com   37


<TABLE>
<CAPTION>
International Growth--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED NOVEMBER 30 (EXCEPT AS NOTED)

                                                                                  Investor Class
                                           1998(1)            1997             1996             1995          1994          1993

PER-SHARE DATA

Net Asset Value,
<S>                                   <C>              <C>              <C>              <C>           <C>           <C>        
Beginning of Period ................. $      9.22      $      8.73      $      7.51      $      7.47   $      7.34   $      5.79
                                      -----------      -----------      -----------      -----------   -----------   -----------
Income From Investment Operations

  Net Investment Income (Loss) ......        0.03(2)          --              (0.01)(2)         0.01         (0.04)        (0.04)

  Net Realized and Unrealized Gain
  on Investment Transactions ........        2.25             1.41             1.24             0.40          0.57          1.78
                                      -----------      -----------      -----------      -----------   -----------   -----------

  Total From Investment Operations ..        2.28             1.41             1.23             0.41          0.53          1.74
                                      -----------      -----------      -----------      -----------   -----------   -----------

Distributions

  From Net Investment Income ........       (0.03)            --              (0.01)            --            --           (0.04)

  In Excess of Net
    Investment Income ...............        --               --               --               --            --           (0.15)

  From Net Realized Gains
  on Investment Transactions ........       (1.28)           (0.92)            --              (0.37)        (0.40)         --
                                      -----------      -----------      -----------      -----------   -----------   -----------

  Total Distributions ...............       (1.31)           (0.92)           (0.01)           (0.37)        (0.40)        (0.19)
                                      -----------      -----------      -----------      -----------   -----------   -----------

Net Asset Value, End of Period ...... $     10.19      $      9.22      $      8.73      $      7.51   $      7.47   $      7.34
                                      ===========      ===========      ===========      ===========   ===========   ===========

  Total Return(3) ...................       28.60%           18.12%           16.35%            5.93%         7.28%        31.04%


RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ...............        1.35%(4)         1.38%(5)         1.65%(5)         1.77%         1.84%         1.90%

Ratio of Net Investment
Income (Loss) to
Average Net Assets ..................        0.72%(4)         0.04%           (0.07)%           0.25%        (0.53)%       (0.34)%

Portfolio Turnover Rate .............          94%             163%             158%             169%          242%          255%

Average Commission Paid
per Share
of Equity Security Traded ........... $    0.0137      $    0.0069      $    0.0195      $    0.0020         --(6)         --(6)

Net Assets, End of Period
(in thousands) ...................... $ 2,387,497      $ 1,728,617      $ 1,342,608      $ 1,210,442   $ 1,316,642   $   759,238
</TABLE>

(1) Six months ended May 31, 1998 (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. voluntarily waived a portion
     of its  management  fee effective  August 1, 1996 through July 30, 1997. In
     absence of the  management fee waiver,  the ratio of operating  expenses to
     average  net assets  would  have been  1.56% and 1.76% for the years  ended
     November 30, 1997 and November 30, 1996, respectively.

(6)  Disclosure of average  commission  paid per share of equity security traded
     was not required prior to the year ended November 30, 1995.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  page itemizes what contributed to
the  class's  change in share  price  during the period,  and  compares  this to
changes over the last five fiscal years (or less, if the class is not five years
old).

On a per-share basis, it includes:
*  share price at the beginning of the period
*  portfolio income and capital gains or losses
*  distributions of income and capital gains paid to shareholders
*  share price at the end of the period

It also includes some key statistics for the period: 

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions
* expense  ratio--operating  expenses,  expressed as a percentage of average net
  assets
* net income ratio--investment income as a percentage of average net assets
* portfolio turnover--the percentage of the portfolio that was replaced

See Notes to Financial Statements


38   1-800-345-2021

<TABLE>
<CAPTION>
International Growth--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED NOVEMBER 30 (EXCEPT AS NOTED)

                                                                                     Advisor Class
                                                                      1998(1)            1997          1996(2)

PER-SHARE DATA

<S>                                                               <C>               <C>            <C>         
Net Asset Value, Beginning of Period ............................ $       9.20      $       8.72   $       8.41
                                                                  ------------      ------------   ------------

Income From Investment Operations

  Net Investment Gain (Loss) ....................................         0.02(3)          (0.03)         (0.01)(3)

  Net Realized and Unrealized Gain on Investment Transactions ...         2.25              1.43           0.32
                                                                  ------------      ------------   ------------

  Total From Investment Operations ..............................         2.27              1.40           0.31
                                                                  ------------      ------------   ------------

Distributions

  From Net Investment Income ....................................        (0.01)             --             --

  From Net Realized Gains on Investment Transactions ............        (1.28)            (0.92)          --
                                                                  ------------      ------------   ------------

  Total Distributions ...........................................        (1.29)            (0.92)          --
                                                                  ------------      ------------   ------------

Net Asset Value, End of Period .................................. $      10.18      $       9.20   $       8.72
                                                                  ============      ============   ============


  Total Return(4) ...............................................        28.44%            17.97%          3.69%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses to Average Net Assets ...............         1.60%(5)          1.63%          1.67%(5)

Ratio of Net Investment Income (Loss) to Average Net Assets .....         0.47%(5)         (0.21)%       (0.76)%(5)

Portfolio Turnover Rate .........................................           94%              163%           158%

Average Commission Paid per Share of Equity Security Traded ..... $     0.0137      $     0.0069   $     0.0195

Net Assets, End of Period (in thousands) ........................ $     14,913      $      9,111   $      3,803
</TABLE>

(1)  Six months ended May 31, 1998 (unaudited).

(2)  October 2, 1996 (commencement of sale) 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.

See Notes to Financial Statements


                                                   www.americancentury.com   39


<TABLE>
<CAPTION>
International Growth--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE PERIODS ENDED AS INDICATED

                                                                               Institutional Class
                                                                            1998(1)           1997(2)

PER-SHARE DATA

<S>                                                                      <C>               <C>         
Net Asset Value, Beginning of Period ................................... $       9.22      $       9.26
                                                                         ------------      ------------
Income From Investment Operations

  Net Investment Income ................................................         0.04(3)           --

  Net Realized and Unrealized Gain (Loss) on Investment Transactions ...         2.25             (0.04)
                                                                         ------------      ------------

  Total From Investment Operations .....................................         2.29             (0.04)
                                                                         ------------      ------------

Distributions

  From Net Investment Income ...........................................        (0.03)             --

  From Net Realized Gains on Investment Transactions ...................        (1.28)             --
                                                                         ------------      ------------

  Total Distributions ..................................................        (1.31)             --
                                                                         ------------      ------------

Net Asset Value, End of Period ......................................... $      10.20      $       9.22
                                                                         ============      ============

  Total Return(4) ......................................................        28.75%            (0.43)%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses to Average Net Assets ......................         1.15%(5)          1.18%(5)

Ratio of Net Investment Income (Loss) to Average Net Assets ............         0.92%(5)        (0.53)%(5)

Portfolio Turnover Rate ................................................           94%              163%

Average Commission Paid per Share of Equity Security Traded ............ $     0.0137      $     0.0069

Net Assets, End of Period (in thousands) ............................... $     24,302      $     18,846
</TABLE>

(1)  Six months ended May 31, 1998 (unaudited).

(2)  November 20, 1997 (commencement of sale) through November 30, 1997.

(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.

See Notes to Financial Statements


40   1-800-345-2021


<TABLE>
<CAPTION>
International Discovery--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED NOVEMBER 30 (EXCEPT AS NOTED)

                                                                              Investor Class
                                                 1998(1)             1997            1996             1995       1994(2)

PER-SHARE DATA

<S>                                          <C>              <C>              <C>              <C>          <C>        
Net Asset Value, Beginning of Period ....... $      8.54      $      7.60      $      5.70      $      5.39  $      5.00
                                             -----------      -----------      -----------      -----------  -----------

Income From Investment Operations

  Net Investment Income (Loss) .............       (0.01)(3)        (0.03)           (0.02)(3)         0.03        (0.02)

  Net Realized and Unrealized Gain
  on Investment Transactions ...............        2.74             1.31             1.95             0.28         0.41
                                             -----------      -----------      -----------      -----------  -----------

  Total From Investment Operations .........        2.73             1.28             1.93             0.31         0.39
                                             -----------      -----------      -----------      -----------  -----------

Distributions

  From Net Investment Income ...............       (0.02)           (0.02)           (0.01)            --           --

  In Excess of Net Realized Gains ..........        --               --              (0.02)            --           --

  From Net Realized Gains
  on Investment Transactions ...............       (0.47)           (0.32)            --               --           --
                                             -----------      -----------      -----------      -----------  -----------

  Total Distributions ......................       (0.49)           (0.34)           (0.03)            --           --
                                             -----------      -----------      -----------      -----------  -----------

Net Asset Value, End of Period ............. $     10.78      $      8.54      $      7.60      $      5.70  $      5.39
                                             ===========      ===========      ===========      ===========  ===========


  Total Return(4) ..........................       33.92%           17.76%           34.06%            5.75%        7.80%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ......................        1.66%(5)         1.70%(6)         1.88%(6)         2.00%        2.00%(5)

Ratio of Net Investment
Income (Loss) to Average Net Assets ........      (0.18)%(5)        (0.37)%          (0.31)%           0.27%      (0.48)%(5)

Portfolio Turnover Rate ....................          86%             146%             130%             168%          56%

Average Commission Paid per Share
of Equity Security Traded .................. $    0.0039      $    0.0054      $    0.0054      $    0.0040        --(7)

Net Assets, End of Period (in thousands) ... $   848,554      $   626,327      $   377,128      $   114,579  $   111,202
</TABLE>

(1)  Six months ended May 31, 1998 (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. voluntarily waived a portion
     of its  management  fee effective  August 1, 1996 through July 30, 1997. In
     absence of the  management fee waiver,  the ratio of operating  expenses to
     average  net assets  would  have been  1.87% and 1.99% for the years  ended
     November 30, 1997 and November 30, 1996, respectively.

(7)  Disclosure of average  commission  paid per share of equity security traded
     was not required prior to the year ended November 30, 1995.

See Notes to Financial Statements

                                                      www.americancentury.com 41


<TABLE>
<CAPTION>
International Discovery--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD ENDED AS INDICATED

                                                                   Advisor Class
                                                                         1998(1)

PER-SHARE DATA

<S>                                                                 <C>         
Net Asset Value, Beginning of Period .............................. $      10.10
                                                                    ------------

Income From Investment Operations

  Net Investment Income(2) ........................................         0.02

  Net Realized and Unrealized Gain on Investment Transactions .....         0.66
                                                                    ------------

  Total From Investment Operations ................................         0.68
                                                                    ------------

Net Asset Value, End of Period .................................... $      10.78
                                                                    ============

  Total Return(3) .................................................         6.73%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses to Average Net Assets .................         1.91%(4)

Ratio of Net Investment Income to Average Net Assets ..............         1.74%(4)

Portfolio Turnover Rate ...........................................           86%

Average Commission Paid per Share of Equity Security Traded ....... $       0.0039

Net Assets, End of Period (in thousands) .......................... $     10,719
</TABLE>

(1)  April 28, 1998 (commencement of sale) through May 31, 1998 (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.

See Notes to Financial Statements


42   1-800-345-2021


<TABLE>
<CAPTION>
International Discovery--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD ENDED AS INDICATED


                                                            Institutional Class
                                                                       1998(1)

PER-SHARE DATA

<S>                                                               <C>         
Net Asset Value, Beginning of Period ............................ $       8.18
                                                                  ------------

Income From Investment Operations

  Net Investment Income(2) ......................................         0.04

  Net Realized and Unrealized Gain on Investment Transactions ...         2.57
                                                                  ------------

  Total From Investment Operations ..............................         2.61
                                                                  ------------

Net Asset Value, End of Period .................................. $      10.79
                                                                  ============

  Total Return(3) ...............................................        31.91%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses to Average Net Assets ...............         1.46%(4)

Ratio of Net Investment Income to Average Net Assets ............         0.86%(4)

Portfolio Turnover Rate .........................................           86%

Average Commission Paid per Share of Equity Security Traded ..... $     0.0039

Net Assets, End of Period (in thousands) ........................ $     62,188
</TABLE>

(1)  January 2, 1998 (commencement of sale) through May 31, 1998 (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.

See Notes to Financial Statements


                                               www.americancentury.com     43


<TABLE>
<CAPTION>
Emerging Markets--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE PERIODS ENDED AS INDICATED

                                                                                  Investor Class
                                                                              1998(1)        1997(2)

PER-SHARE DATA

<S>                                                                      <C>              <C>         
Net Asset Value, Beginning of Period ................................... $       4.15     $       5.00

Income From Investment Operations

  Net Investment Gain (Loss)(3) ........................................         0.01            (0.01)

  Net Realized and Unrealized Gain (Loss) on Investment Transactions ...         0.09            (0.84)


  Total From Investment Operations .....................................         0.10            (0.85)


Net Asset Value, End of Period ......................................... $       4.25     $       4.15


  Total Return(4) ......................................................         2.41%          (17.00)%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses to Average Net Assets ......................         2.00%(5)         2.00%(5)

Ratio of Net Investment Income (Loss) to Average Net Assets ............         0.30%(5)       (0.74)%(5)

Portfolio Turnover Rate ................................................          143%              36%

Average Commission Paid per Share of Equity Security Traded ............ $     0.0006     $     0.0012

Net Assets, End of Period (in thousands) ............................... $     21,570     $     11,830
</TABLE>

(1)  Six months ended May 31, 1998 (unaudited).

(2)  September 30, 1997 (inception) through November 30, 1997.

(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.

See Notes to Financial Statements


44   1-800-345-2021


Share Class 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.

     Now  more  share  purchases  are  made  by  investors   through   financial
intermediaries  (who ordinarily are compensated for the additional services they
provide),  or by very  large  institutional  investors  who expect  lower  costs
because of their size. In September 1996,  American Century began to offer three
classes of shares for International Growth and International Discovery. American
Century also offers three classes of shares for Emerging  Markets.  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 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 is available to  endowments,
foundations,  defined benefit pension plans or financial  intermediaries serving
these  investors.  This class  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.  In  recognition of the
comparatively lower transaction costs on large accounts, the total expense ratio
of the Institutional Class shares is 0.20% less than the Investor Class shares.

     The Advisor and  Institutional  Classes of shares for Emerging  Markets had
not commenced as of May 31, 1998.

     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.


                                                      www.americancentury.com 45


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The  Twentieth  Century  Group  offers 10 equity  funds that  invest in the
stocks of growing companies,  both domestically and  internationally,  using our
accelerating  growth  philosophy.  This  philosophy  focuses on three  important
principles.  First, the funds seek to own successful companies,  which we define
as those with growing  earnings  and  revenues.  Second,  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 those
opportunities can  significantly  limit the potential for gain. Third, the funds
are managed by teams,  rather than by one "star" manager. We believe this allows
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.

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

     EMERGING MARKETS invests primarily in the equity securities of companies in
emerging market countries that exhibit accelerating growth. The companies may be
located or principally traded in emerging market countries,  and also may derive
a significant  portion of their business from emerging  market  countries.  This
fund may experience  greater share price  fluctuation  and short-term  risk than
either International Growth or International Discovery.

     International   investing  involves  special  risks,   including  political
instability  and economic  risk.  Investing in emerging  markets may  accentuate
these  risks.  Historically,  share  prices  of small  companies  have been more
volatile than those of large companies.

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. As a result,  the value of your  investment  could change based
solely upon changes in the exchange  rates between  foreign  currencies  and the
U.S. dollar. 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.  (The weakened foreign currencies buys 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.

     MORGAN STANLEY CAPITAL  INTERNATIONAL  (MSCI) has developed several indices
that measure the  performance  of foreign stock  markets.  The best known is the
EUROPE, AUSTRALASIA,  FAR EAST INDEX (EAFE(reg.tm)),  which is a widely followed
group of stocks from 20 countries.  Within this index are two narrower  indices,
MSCI EUROPE and MSCI FAR EAST,  which measure stock  performance  in 14 European
countries and four Asian countries, respectively.

     The MORGAN STANLEY EMERGING MARKETS FREE INDEX (EMF(reg.tm)) represents the
performance of stocks in 26 emerging market  countries in Europe,  Latin America
and the Pacific Basin.


[left margin]

PORTFOLIO MANAGERS

INTERNATIONAL GROWTH
PORTFOLIO MANAGER:     HENRIK STRABO
PORTFOLIO MANAGER:     MARK KOPINSKI

INTERNATIONAL DISCOVERY
PORTFOLIO MANAGER:     HENRIK STRABO
PORTFOLIO MANAGER:     MARK KOPINSKI

EMERGING MARKETS

PORTFOLIO MANAGER:     MARK KOPINSKI
PORTFOLIO MANAGER:     MIKE DONNELLY, CFA


46   1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* 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.

* 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 38 through 44.

PORTFOLIO STATISTICS

* 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.)

* 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.


                                                      www.americancentury.com 47


Notes
- --------------------------------------------------------------------------------


48   1-800-345-2021


[inside back cover]

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

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

INVESTOR SERVICES:  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 MUTUAL FUNDS, INC.


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS  REPORT AND THE  STATEMENTS  IT  CONTAINS  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.

(c) 1998 AMERICAN CENTURY SERVICES CORPORATION
FUNDS DISTRIBUTOR, INC.

[recycled logo]
   Recycled


[back cover]

[40 Years Logo]
Four Decades of Serving Investors
40 Years
American Century
1958-1998

American Century Investments                                    BULK RATE    
P.O.Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                  AMERICAN CENTURY 
www.americancentury.com                                         COMPANIES    


9807                             (c)1998 American Century Services Corporation
SH-BKT-12814


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