VANGUARD ASSET ALLOCATION FUND INC
N-30D, 2000-05-23
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<PAGE>
VANGUARD(R)
ASSET ALLOCATION FUND

[PHOTO]

SEMIANNUAL REPORT
March 31, 2000

[THE VANGUARD GROUP LOGO]

<PAGE>

HAVE THE PRINCIPLES OF INVESTING CHANGED?

In a world  of  frenetic  change  in  business,  technology,  and the  financial
markets,  it is natural to wonder whether the basic principles of investing have
changed.

     We don't think so.

     The most  successful  investors  over the coming  decade  will be those who
began the new century with a fundamental  understanding  of risk and who had the
discipline to stick with long-term investment programs.

     Certainly,  investors  today  confront a challenging,  even  unprecedented,
environment.  Valuations of market  indexes are at or near historic  highs.  The
strength and duration of the bull market in U.S.  stocks have inflated  people's
expectations  and  diminished  their  recognition  of the market's  considerable
risks. And the incredible  divergence in stock returns--many  technology-related
stocks  gained  100% or more in 1999,  yet prices fell for more than half of all
stocks--has made some investors question the idea of diversification.

     And then there is the  Internet.  Undeniably,  it is a powerful  medium for
communications and transacting business.  For investors,  the Internet is a vast
source  of  information  about  investments,  and  online  trading  has  made it
inexpensive and convenient to trade stocks and invest in mutual funds.

     However,  new tools do not guarantee good  workmanship.  Information is not
the same as wisdom.  Indeed,  much of the information,  opinion,  and rumor that
swirl  about  financial  markets  each day  amounts  to  "noise"  of no  lasting
significance.  And the fact  that  rapid-fire  trading  is easy does not make it
beneficial.   Frequent  trading  is  almost  always  counterproductive   because
costs--even at low commission rates--and taxes detract from the returns that the
markets  provide.  Sadly,  many  investors jump into a "hot" mutual fund just in
time to see it  cool  off.  Meanwhile,  long-term  fund  investors  are  hurt by
speculative  trading  activity  because they bear part of the costs  involved in
accommodating purchases and redemptions.

     Vanguard  believes that  intelligent  investors  should  resist  short-term
thinking and focus instead on a few time-tested principles:

     o Invest for the long term.  Pursuing your  long-term  investment  goals is
more like a marathon than a sprint.

     o Diversify  your  investments  with  holdings in stocks,  bonds,  and cash
investments.

Remember  that,  at any moment,  some part of a diversified  portfolio  will lag
other  parts,  and be  wary  of  taking  on  more  risk  by  "piling  onto"  the
best-performing  part of your holdings.  Today's leader could well be tomorrow's
laggard.

     o Step back from the daily  frenzy of the  markets;  focus on your  overall
asset allocation.

     o Capture as much of the market's  return as possible by  minimizing  costs
and taxes.  Costs and taxes  diminish  long-term  returns while doing nothing to
reduce the risks you incur as an investor.

- - - - - - - --------------------------------------------------------------------------------
CONTENTS

REPORT FROM THE CHAIRMAN        1          PERFORMANCE SUMMARY             7
THE MARKETS IN PERSPECTIVE      3          FUND PROFILE                    8
REPORT FROM THE ADVISER         5          FINANCIAL STATEMENTS           12
- - - - - - - --------------------------------------------------------------------------------

All  comparative  mutual fund data  arefrom  Lipper Inc. or  Morningstar,  Inc.,
unless otherwise noted.
"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.
Frank Russell Company is the owner of trademarks and copyrights  relating to the
Russell Indexes.
"Wilshire 4500" and "Wilshire 5000" are trademarks of Wilshire Associates.

<PAGE>

REPORT FROM THE CHAIRMAN


[PHOTO]
JOHN J. BRENNAN

Vanguard Asset  Allocation Fund delivered an excellent  absolute return of 10.8%
during the six months ended March 31,  2000,  the first half of our fiscal year.
However,  your fund's  performance was less impressive on a relative basis as it
lagged the returns of its average  competitor and its composite  index of stocks
and bonds.
- - - - - - - ------------------------------------------------------------
                                         TOTAL RETURNS
                                        SIX MONTHS ENDED
                                        MARCH 31, 2000
- - - - - - - ------------------------------------------------------------
Vanguard Asset Allocation Fund              10.8%
- - - - - - - ------------------------------------------------------------
Average Flexible Fund*                      13.6%
- - - - - - - ------------------------------------------------------------
Asset Allocation Composite Index**          13.5%
- - - - - - - ------------------------------------------------------------
S&P 500 Index                               17.5%
Lehman Long Treasury Index                   5.8
Salomon Smith Barney 3-Month
  Treasury Index                             2.6
- - - - - - - ------------------------------------------------------------
 *Derived from data provided by Lipper Inc.
**65% S&P 500 Index and 35% Lehman Long
  Treasury Index.

     The adjacent table compares our six-month total return (capital change plus
reinvested dividends) with those of the average competing fund and our composite
index, which is weighted 65% in large-capitalization stocks and 35% in long-term
U.S.  Treasury  bonds.  We also  present  six-month  returns for the index's two
components--the  Standard & Poor's 500 Index and the Lehman  Brothers  Long U.S.
Treasury  Bond  Index--as  well as for the Salomon  Smith  Barney  3-Month  U.S.
Treasury Bill Index, a measure of short-term reserves. As you know, the fund may
invest in any combination of the three asset classes.

     The fund's  return is based on an  increase  in net asset value from $24.11
per share on September 30, 1999,  to $25.14 per share on March 31, 2000,  and is
adjusted for a dividend of $0.53 per share paid from net investment income and a
distribution of $0.96 per share paid from net realized capital gains.

THE PERIOD IN REVIEW

In March,  the  remarkably  vibrant U.S.  economy  completed  its 108th month of
uninterrupted  expansion--a  record nine full years without a recession.  In the
last quarter of 1999,  the economy was growing at an astounding  7.3% rate.  The
engine of the expansion--consumer  demand--remained strong throughout our fiscal
half-year.  Americans' ardor for spending  combined with other factors to prompt
an uptick in inflation.  But there was also remarkable  growth in the production
of goods and services during the period,  and corporate profits  improved.  Amid
these  generally  accommodating  conditions,  stock market  averages turned in a
terrific, yet turbulent, performance. The bond market was generally weak.

     Large-cap  stocks--which  had  gained  just 0.4% from  April  1999  through
September  1999--resumed  their climb. The S&P 500 Index,  which is dominated by
large-cap  stocks,  gained 17.5%. The overall U.S. stock market,  as measured by
the Wilshire 5000 Total Market Index, did even better, advancing 23.2%.

     The bull market in stocks continued  despite three  quarter-point  interest
rate  hikes--raising  the federal  funds rate from 5.25% to 6.0%--by the Federal
Reserve  Board.  The yield on Treasury  bills  responded  by climbing  102 basis
points (1.02 percentage  point) to 5.87% as of March 31. But long-term  interest
rates went the other way. The yield of the benchmark  30-year Treasury bond fell
22 basis points, on balance, ending the  half-year--unusually--below  the T-bill
rate, at 5.83%.  Typically,  long-term bonds carry

                                       1

<PAGE>

higher yields than short-term bonds. This relationship,  which is often depicted
in an upward sloping yield curve,  compensates  long-term bond investors for the
risks  associated  with cash flows that they will not  receive  for many  years.
Analysts  attributed  the  inversion  of the yield  curve  during  the period to
technical factors that are unlikely to persist for long.

     The overall bond market,  as measured by the Lehman  Aggregate  Bond Index,
returned   2.1%,  as  price  declines  for   corporate,   mortgage-backed,   and
shorter-term  Treasury  bonds  offset  some of  their  interest  income.  Prices
declined  because  short-term  interest  rates rose,  making the fixed yields on
outstanding bonds less attractive.  One oasis in this difficult  environment was
the market for  long-term  Treasury  bonds,  which posted a total return of 5.8%
thanks to the slight downward movement of yields on long-term Treasuries.

PERFORMANCE OVERVIEW

Vanguard  Asset   Allocation   Fund  is  managed   according  to  a  proprietary
asset-allocation  model  developed by our  investment  adviser,  Mellon  Capital
Management.  The model assesses various factors to project the long-term returns
on stocks,  bonds, and short-term reserves.  It then recommends asset allocation
changes designed to exploit temporary  imbalances  between the prices and values
of the different  asset  classes.  During the first half of our fiscal year, our
adviser  made just one shift.  The fund moved from 50%  stocks/50%  bonds to 40%
stocks/60% bonds in November and remained in that  position--which  it last took
in 1992--for the remainder of the period. The fund has never had a smaller stake
in stocks. (For more information, see the Report from the Adviser on page 5.)

     In a period of rising stock prices, of course, this relatively conservative
allocation  had a cost.  A "neutral"  mix of 65% stocks and 35% bonds would have
provided a return of 13.5% for the six months. Likewise, our average competitor,
which  provided  a total  return of 13.6%,  held a bigger  stake in  stocks--and
therefore  outperformed--Vanguard  Asset  Allocation Fund. Six months is far too
brief a period,  however, to judge the effectiveness of an investment  strategy.
We note that Asset Allocation Fund's long-term record,  compiled  exclusively by
Mellon Capital, is excellent. The fund has managed to provide much of the return
of stocks while taking significantly less risk.

IN SUMMARY

Stocks continued to provide impressive returns during the six months ended March
31. But volatility was extreme.  In fact, as I write this letter, the U.S. stock
market has just completed an eye-opening week during which the S&P 500 Index and
the Nasdaq Composite Index declined -10.5% and -25.3%, respectively.

     How should an investor  respond to such  volatility?  By holding a balanced
investment  portfolio that includes stocks,  bonds,  and short-term  reserves in
proportions  that are  appropriate to his or her time horizon,  goals,  and risk
tolerance. Once such a program is in place, the best course is to stick with it.
Short-term  fluctuations  are  unsettling,  but  they  are  a  natural  part  of
investing.


/S/
John J. Brennan
Chairman and Chief Executive Officer

April 17, 2000

                                       2
<PAGE>

THE MARKETS IN PERSPECTIVE
SIX MONTHS ENDED MARCH 31, 2000

A strong economy and an  extraordinary  run-up in prices for  technology  stocks
carried broad market  indexes  higher during a volatile but generally  rewarding
six  months ended March 31, 2000.

     The rise in stocks was  surprising in light of higher  inflation and rising
interest  rates,  both of which  did  some  damage  to bond  prices.  For  stock
investors,  however,  worries about  inflation and interest  rates did little to
dampen enthusiasm for technology, telecommunications, and media companies.

     The U.S. economy  continued its rapid growth during the semiannual  period.
Gross domestic  product,  an estimate of total economic  output,  increased at a
7.3% pace,  even after  inflation,  during the final three  months of 1999.  The
economy  expanded by more than 4% during 1999, which is a brisk clip for a large
economy,  especially one that in March completed a record 108 consecutive months
without a recession.

- - - - - - - ----------------------------------------------------------------------
                                              TOTAL RETURNS
                                        PERIODS ENDED MARCH 31, 2000
                                       -------------------------------
                                      6 MONTHS    1 YEAR     5 YEARS*
- - - - - - - ----------------------------------------------------------------------
STOCKS
  S&P 500 Index                       17.5%       17.9%       26.8%
  Russell 2000 Index                  26.8        37.3        17.2
  Wilshire 5000 Index                 23.2        24.0        25.9
  MSCI EAFE Index                     17.0        25.4        12.7
- - - - - - - ----------------------------------------------------------------------
BONDS
  Lehman Aggregate Bond Index          2.1%        1.9%        7.1%
  Lehman 10 Year Municipal Bond Index  2.2         0.5         6.2
  Salomon Smith Barney 3-Month
   U.S. Treasury Bill Index            2.6         5.0         5.2
- - - - - - - ----------------------------------------------------------------------
OTHER
  Consumer Price Index                 1.9%        3.7%        2.5%
- - - - - - - ----------------------------------------------------------------------
*Annualized.

     Inflation  measures  sent mixed  messages.  Higher oil prices did cause the
Consumer Price Index to increase by 1.9% and 3.7% for the six- and  twelve-month
periods  ended  March 31.  But if energy  and food  prices  were  factored  out,
inflation remained tame. Nonetheless,  the Federal Reserve Board, concerned that
rapid  growth and low  unemployment  (around 4% of the  workforce)  would  cause
inflation to build momentum, continued the efforts it began in June 1999 to slow
the economy.  The Fed raised its target for  short-term  interest  rates by 0.25
percentage point on three occasions during the six months,  bringing the federal
funds rate to 6.0%.

U.S. STOCK MARKETS

The  technology  sector  continued  to  dominate  the stock  market  during  the
half-year,  although it suffered  some  setbacks.  Over a five-week  period from
March 10  through  April 14,  technology  stocks  fell  sharply  and the  Nasdaq
Composite  Index,  which is  dominated  by large  tech  issues,  declined  -34%.
However,  for the six months ended March 31, the Nasdaq Composite  registered an
incredible 67.3% return.

     The overall stock market, as measured by the Wilshire 5000 Index,  posted a
23.2% gain.  Large-capitalization  stocks  didn't do quite as well--the  S&P 500
Index returned 17.5%. The small-cap Russell 2000 Index gained 26.8%.

                                       3
<PAGE>

     Computer  software and hardware  companies,  semiconductor  makers,  and an
array of Internet-related  companies powered the advance on Wall Street. Indeed,
one-third  of the 57 companies in the S&P 500's tech group gained more than 100%
during  the  six  months.   A  number  of  tech-related   companies  within  the
producer-durables  and  utility  groups also posted  impressive  gains.  For the
half-year,  technology  stocks,  which  accounted for  one-quarter  of the total
market  capitalization  of the  S&P 500  Index,  gained  53%.  Producer-durables
companies  returned 36%. The oil-drilling  and services  companies in the "other
energy" category benefited from higher oil prices and returned about 30% for the
six months.

     Despite  the  impressive  gains for the market  averages,  many  individual
stocks  declined.  The market's  worst-performing  sectors were consumer staples
(-14%), including large food, beverage, supermarket, and tobacco stocks, and the
materials & processing  group  (-6%),  which was hurt by higher  energy  prices,
competitive pressure from imports, and higher interest rates.

     With demand for stocks  high,  Wall Street came up with new supply:  During
the first  three  months of 2000,  a record $75  billion in new stock was issued
through underwriters.

U.S. BOND MARKETS

The step-by-step  increases in short-term  interest rates by the Federal Reserve
did succeed in elevating other short-term rates. For example,  yields of 3-month
U.S.  Treasury bills rose by 102 basis points (about 1 percentage  point) during
the half-year, from 4.85% on September 30 to 5.87% on March 31. Yields on 3-year
Treasury notes rose about 75 basis points, in line with the Fed's actions.

     But for long-term  Treasury  bonds,  interest rates fell during the period.
This  was due  primarily  to the  federal  government's  budget  surplus,  which
resulted in reduced  issuance of new bonds and steps by the Treasury to buy back
some of its existing  long-term  securities.  This  reduced  supply of long-term
bonds  caused the yield on the 30-year  Treasury  to fall 22 basis  points--from
6.05% to 5.83%--during the half-year. Yields of 10-year Treasury securities rose
only 12 basis points to 6.00% as of March 31.

     Higher  short-term  rates and lower or relatively  stable  long-term  rates
resulted in an inversion in the yield curve. Instead of the usual upward sloping
curve--with yields rising along with the maturity of Treasury securities--yields
were lower for long-term bonds.

     Outside  of the  Treasury  market,  yields  rose and  prices  fell for most
intermediate-  to long-term  corporate  and  municipal  bonds.  The overall bond
market, as measured by the Lehman Aggregate Bond Index, posted a 2.1% return, as
an average price decline of -1.3% offset much of the 3.4% income provided by the
market.

INTERNATIONAL STOCK MARKETS

Stock markets in Europe,  Asia, and many emerging markets produced  double-digit
gains during the half-year as investors  responded to improving  global economic
growth and a rise in  corporate  merger and  acquisition  activity.  The overall
return from developed foreign markets was an excellent 17.0%, as measured by the
Morgan Stanley Capital International Europe, Australasia, Far East (EAFE) Index.

     In Europe, an average return of 27.7% in  local-currency  terms was reduced
to 17.6% for U.S.  investors because of the U.S. dollar's gains against European
currencies.  (Returns from abroad are diminished  when the dollar rises in value
against other  currencies,  and increased  when the dollar falls.) Stocks in the
Pacific region, which is dominated by Japan, returned 15.6% in dollars and 12.8%
in local-currency  terms. The Select Emerging Markets Free Index soared 26.2% in
dollars, led by big gains in Turkey (111%) and Brazil (60%).

                                       4
<PAGE>

REPORT FROM THE ADVISER

Vanguard  Asset  Allocation  Fund had a total return of 10.8% for the six months
ended  March 31,  2000.  This was below the  13.5%  return of the  fund's  index
benchmark,  a composite that is weighted 65% in stocks and 35% in bonds. The S&P
500 Index, which constitutes the stock portion of the benchmark, returned 17.5%.
The other benchmark  component,  the Lehman Long Treasury  Index,  returned 5.8%
during the half-year.

     Stocks outperformed bonds during the first fiscal quarter while the economy
continued on its path of solid growth with low inflation. Gross domestic product
(GDP) grew at a 5.7% annual rate in the quarter ended  September 30. During that
quarter,  the personal spending  component of GDP, which accounts for two-thirds
of economic  activity,  grew at a 4.9% pace.  The  Conference  Board's  Consumer
Confidence  Index rose to a 31-year high of 141.7 in December,  when the jobless
rate was at a  30-year  low of 4.1%.  Yet  there  were few  signs of a pickup in
broad-based  inflation during the quarter.  Core  inflation--as  measured by the
Consumer Price Index excluding  energy and  food--remained  near the 33-year low
touched in August.  Meanwhile, in most industries,  companies found it difficult
to raise  prices  due to  tough  competition,  a fact  reflected  in  restrained
increases in producer prices. The core rate of inflation in producer prices grew
by just  0.8% in 1999,  and the GDP  price  deflator--the  broadest  measure  of
inflation--rose at a 1.1% rate.

     However,  by late 1999 it appeared  that the strong  demand for workers was
exerting  modest upward  pressure on  wages--average  hourly  earnings rose 0.4%
during  December and 3.7% for all of 1999.  Even so, the rise in average  hourly
earnings was lower than those seen in both 1998 and 1997. Nevertheless,  in view
of the tight labor market, the Federal Reserve Board acted preemptively, raising
its target  federal funds rate to 5.5% on November 16, the third  increase since
June 1999.

     Bonds significantly  outperformed stocks during the January-March  quarter,
during which the current economic  expansion became the longest in U.S. history.
The Lehman  Long  Treasury  Bond Index  returned  8.1%,  while the S&P 500 Index
gained 2.3%.  In its  continuing  effort to slow the economy and keep  inflation
from  accelerating,  the Federal Reserve raised the target for the federal funds
rate twice to a level of 6.0% by quarter-end. In all, the Fed has raised the fed
funds rate five times by a total of 1.25 percentage points since June 1999.

- - - - - - - --------------------------------------------------------------------------------
INVESTMENT PHILOSOPHY
The adviser  believes that,  although the financial  markets are very efficient,
imbalances can be identified in the relative pricing of stocks, bonds, and money
market  instruments.  Implicit in this approach is a belief that such imbalances
occur  only  periodically  and do not  persist  for long  periods.  The  adviser
attempts to identify these windows of opportunity and to structure the portfolio
to take advantage of them.
- - - - - - - --------------------------------------------------------------------------------

     However, through March 2000 there was little evidence that higher rates had
slowed  the  economy's  growth.   Labor  markets  remained  tight  and  economic
indicators continued to signal stronger-than-expected  growth. The economy added
817,000 jobs during the January-March quarter,  pushing the unemployment rate as
low as 4.0% in  January--near  the record of 3.9% recorded in January 1970.  The
Consumer  Confidence  Index  reached  an  all-time  high of  144.7  in  January,
surpassing  the record of 142.3 set in October 1968.  GDP grew at an annual rate
of 7.3% in the fourth quarter of 1999, the fastest pace since a 9.0%
                                       5
<PAGE>

annual rate in the first quarter of 1984. For all of 1999, the economy grew at a
4.6% "real" rate (after inflation),  having grown 4.3% in 1998 and 4.5% in 1997.
The last time the  economy  expanded  at 4% or more for three years in a row was
1976-1978.  Again, inflation remained subdued, despite well-publicized increases
in the price of oil. For the 12 months through March 2000, core inflation, which
excludes energy and food prices,  was 1.2% at the producer level and 2.4% at the
consumer level.

     The fund began the  semiannual  period with an allocation of 50% stocks/50%
bonds.  The  sharp  divergence  in  returns  on  stocks  and  bonds  during  the
October-December  quarter  presented an  opportunity  for us to shift the fund's
asset  allocation.  The rise in equity prices through early November lowered the
expected  return on stocks,  while higher bond yields raised the expected return
on bonds.  The net effect of these changes was to narrow the spread  between the
expected  returns on stocks and bonds,  prompting our tactical asset  allocation
model to call for a shift of 10% of assets from  stocks into bonds.  On November
4, the fund's allocation was shifted to 40% stocks/60% bonds.

     As stock prices continued to rise during  December,  the expected return on
stocks fell.  Meanwhile,  increasing  bond yields raised the expected  return on
bonds.  Although these changes  narrowed the spread between the expected returns
on stocks and bonds, the narrowing  wasn't  sufficient to prompt a change in the
fund's holdings.

     A decline  in stock  prices in January  and  February  raised the  expected
return on stocks,  while falling bond yields lowered  expected returns on bonds.
But the changes weren't enough to trigger any shifts in asset allocation. Stocks
increased during early March,  lowering their expected return.  Meanwhile,  bond
yields  continued to fall,  further  lowering the expected  return on bonds.  On
balance,  expected returns for stocks and bonds didn't change much, and the fund
held its allocation at approximately 40% stocks and 60% bonds.

     During  the past six  months,  forecasts  of  improved  corporate  earnings
boosted expected returns on stocks.  Our long-run  forecast for stock returns is
near 10%.  However,  with yields on long Treasury  bonds near 6.0%, our tactical
asset  allocation  model finds  bonds  somewhat  more  attractive  than  stocks.
Therefore,  the  Asset  Allocation  Fund has a lighter  weight  in stocks  and a
heavier weight in bonds than our index benchmark.

William L. Fouse, CFA
Mellon Capital Management Corporation

April 13, 2000
                                       6

<PAGE>

PERFORMANCE SUMMARY
ASSET ALLOCATION FUND

All of the data on this page represent past performance, which cannot be used to
predict  future returns that may be achieved by the fund.  Note,  too, that both
share  price and  return  can  fluctuate  widely.  An  investor's  shares,  when
redeemed, could be worth more or less than their original cost.


TOTAL INVESTMENT RETURNS: NOVEMBER 3, 1988-MARCH 31, 2000
- - - - - - - ----------------------------------------------------------
             ASSET ALLOCATION FUND             COMPOSITE
                                               INDEX*
FISCAL  CAPITAL      INCOME      TOTAL         TOTAL
YEAR    RETURN       RETURN      RETURN        RETURN
- - - - - - - ----------------------------------------------------------
1989    21.1%        2.8%        23.9%         27.8%
1990    -8.6         4.0         -4.6          -5.1
1991    20.9         6.4         27.3          27.5
1992     7.2         5.0         12.2          12.2
1993    10.7         4.7         15.4          15.5
1994    -5.2         3.1         -2.1          -1.5
- - - - - - - ----------------------------------------------------------
             ASSET ALLOCATION FUND             COMPOSITE
                                               INDEX*
FISCAL  CAPITAL      INCOME      TOTAL         TOTAL
YEAR    RETURN       RETURN      RETURN        RETURN
- - - - - - - ----------------------------------------------------------
1995    23.6%        5.0%        28.6%         27.4%
1996    11.1         4.2         15.3          13.9
1997    24.7         4.7         29.4          30.4
1998    11.5         3.7         15.2          14.2
1999    10.5         4.2         14.7          14.4
2000**  8.5          2.3         10.8          13.5
- - - - - - - ----------------------------------------------------------
 *65% S&P 500 Index, 35% Lehman Long Treasury Index.
**Six months ended March 31, 2000.
See  Financial  Highlights  table  on page 20 for  dividend  and  capital  gains
information for the past five years.


AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED MARCH 31, 2000
- - - - - - - --------------------------------------------------------------------------------
                                                                 10 YEARS
                      INCEPTION                           ----------------------
                        DATE      1 YEAR    5 YEARS      CAPITAL  INCOME   TOTAL
- - - - - - - --------------------------------------------------------------------------------
Asset Allocation Fund 11/3/1988  10.01%    20.82%       11.40%   4.48%    15.88%
- - - - - - - --------------------------------------------------------------------------------

                                       7

<PAGE>

FUND PROFILE
ASSET ALLOCATION FUND

This Profile provides a snapshot of the fund's  characteristics  as of March 31,
2000,  compared where  appropriate to an unmanaged  index.  Key elements of this
Profile are defined on pages 10 and 11.

TOTAL FUND CHARACTERISTICS                    FUND ASSET ALLOCATION*
- - - - - - - ---------------------------------             ----------------------------------
Turnover Rate    31%*                         STOCKS         41%
Expense Ratio  0.47%*                         BONDS          58%
Cash Reserves   1.2%                          CASH RESERVES   1%

*Annualized.                                  *Actual  allocation may vary
                                               slightly from target  allocation
                                               because of day-to-day market
                                               fluctuations.



TOTAL FUND VOLATILITY MEASURES
- - - - - - - -------------------------------------
          ASSET ALLOCATION   S&P 500
- - - - - - - -------------------------------------
R-Squared      0.90         1.00
Beta           0.61         1.00




TEN LARGEST STOCKS
(% OF EQUITIES)
- - - - - - - -------------------------------------------
Microsoft Corp.                        4.3%
Cisco Systems, Inc.                    4.2
General Electric Co.                   4.0
Intel Corp.                            3.5
Exxon Mobil Corp.                      2.1
Wal-Mart Stores, Inc.                  1.9
Oracle Corp.                           1.7
International Business Machines Corp.  1.7
Citigroup, Inc.                        1.6
Lucent Technologies, Inc.              1.5
- - - - - - - -------------------------------------------
Top Ten                               26.5%
- - - - - - - -------------------------------------------
Top Ten as % of Total Net Assets       8.2%




SECTOR DIVERSIFICATION (% OF COMMON STOCKS)
- - - - - - - --------------------------------------------------------------------------------
                           MARCH 31, 1999               MARCH 31, 2000
                     -----------------------------------------------------------
                           ASSET ALLOCATION     ASSET ALLOCATION        S&P 500
                     -----------------------------------------------------------
Auto & Transportation           2.5%                 1.9%                 1.9%
Consumer Discretionary         13.2                 12.5                 12.5
Consumer Staples                8.4                  5.0                  5.0
Financial Services             16.7                 13.5                 13.5
Health Care                    12.4                  9.0                  9.0
Integrated Oils                 5.1                  4.6                  4.6
Other Energy                    1.0                  1.7                  1.7
Materials & Processing          3.3                  2.6                  2.5
Producer Durables               3.2                  4.0                  4.0
Technology                     17.3                 29.4                 29.4
Utilities                      11.1                  9.7                  9.7
Other                           5.8                  6.1                  6.2
- - - - - - - --------------------------------------------------------------------------------

                                       8

<PAGE>

EQUITY CHARACTERISTICS
- - - - - - - --------------------------------------------------------------------------------
                  ASSET ALLOCATION      S&P 500
- - - - - - - ------------------------------------------------
Number of Stocks               505         500
Median Market Cap           $94.4B      $94.4B
Price/Earnings Ratio         28.7x       28.7x
Price/Book Ratio              5.7x        5.7x
Dividend Yield                1.1%        1.1%
Return on Equity             24.2%       24.2%
Earnings Growth Rate         16.4%       16.4%
Foreign Holdings              1.2%        1.2%



EQUITY INVESTMENT FOCUS
- - - - - - - ----------------------------
[GRID]
STYLE                  BLEND
MARKET CAP             LARGE



FIXED-INCOME CHARACTERISTICS
- - - - - - - ----------------------------------------------------------
                                                LEHMAN
                     ASSET ALLOCATION           INDEX*
- - - - - - - ----------------------------------------------------------
Number of Bonds              31                  5,566
Average Coupon              8.0%                  6.8%
Average Duration      10.5 years             4.9 years
Average Maturity      21.0 years             8.9 years
Average Quality        Treasury                    Aaa

*Lehman Aggregate Bond Index.



FIXED-INCOME INVESTMENT FOCUS
- - - - - - - --------------------------------------
[GRID]
AVERAGE MATURITY       LONG
CREDIT QUALITY         TREASURY/AGENCY


                                       9
<PAGE>

AVERAGE COUPON. The average interest rate paid on the securities held by a fund.
It is expressed as a percentage of face value.

AVERAGE  DURATION.  An  estimate  of how much a bond  fund's  share  price  will
fluctuate in response to a change in interest  rates. To see how the price could
shift,  multiply the fund's  duration by the change in rates.  If interest rates
rise by one percentage point, the share price of a fund with an average duration
of five years  would  decline  by about 5%. If rates  decrease  by a  percentage
point, the fund's share price would rise by 5%.

AVERAGE  MATURITY.  The average  length of time until bonds held by a fund reach
maturity  (or are  called) and are  repaid.  In general,  the longer the average
maturity, the more a fund's share price will fluctuate in response to changes in
market interest rates.

AVERAGE QUALITY. An indicator of credit risk, this figure
is the  average of the  ratings  assigned  to a fund's  securities  holdings  by
credit-rating  agencies.  The agencies make their judgment  after  appraising an
issuer's ability to meet its obligations. Quality is graded on a scale, with Aaa
or AAA indicating the most creditworthy bond issuers and A-1 or MIG-1 indicating
the  most  creditworthy  issuers  of  money  market  securities.  U.S.  Treasury
securities are considered to have the highest credit quality.

BETA. A measure of the magnitude of a fund's past  share-price  fluctuations  in
relation  to the ups and downs of the  overall  market  (or  appropriate  market
index).  The market (or index) is assigned a beta of 1.00, so a fund with a beta
of 1.20  would have seen its share  price  rise or fall by 12% when the  overall
market rose or fell by 10%.

CASH  RESERVES.  The  percentage  of a  fund's  net  assets  invested  in  "cash
equivalents"--highly  liquid,  short-term,  interest-bearing  instruments.  This
figure does not include cash invested in futures  contracts to simulate stock or
bond investment.

DIVIDEND  YIELD.  The current,  annualized  rate of dividends paid on a share of
stock,  divided by its current  share price.  For a fund,  the weighted  average
yield for stocks it holds.

EARNINGS  GROWTH RATE.  The average  annual rate of growth in earnings  over the
past five years for the stocks now in a fund.

EQUITY  INVESTMENT  FOCUS.  This grid  indicates  the  focus of a fund's  equity
holdings in terms of two attributes:  market capitalization  (large,  medium, or
small) and relative valuation (growth, value, or a blend).

EXPENSE  RATIO.  The  percentage of a fund's  average net assets used to pay its
annual  administrative  and advisory  expenses.  These expenses  directly reduce
returns to investors.

FIXED-INCOME  INVESTMENT  FOCUS.  This  grid  indicates  the  focus  of a fund's
fixed-income  holdings  in terms of two  attributes:  average  maturity  (short,
medium, or long) and average credit quality  (Treasury/agency,  investment-grade
corporate, or below investment-grade).

FOREIGN HOLDINGS. The percentage of a fund's equity assets represented by stocks
or American Depositary Receipts of companies based outside the United States.

FUND ASSET  ALLOCATION.  This chart shows the  proportions of a fund's  holdings
allocated to different types of assets.

MEDIAN  MARKET  CAP.  An  indicator  of the  size of  companies  in which a fund
invests;  the  midpoint  of  market   capitalization   (market  price  x  shares
outstanding) of a fund's stocks, weighted by the proportion of the fund's assets
invested  in each  stock.  Stocks  representing  half of the fund's  assets have
market capitalizations above the median, and the rest are below it.

NUMBER OF BONDS.  An indicator of  diversification.  The more separate  issues a
fund holds,  the less  susceptible  it is to a price  decline  stemming from the
problems of a particular bond issuer.

                                       10

<PAGE>

NUMBER OF STOCKS. An indicator of diversification. The more stocks a fund holds,
the more  diversified  it is and the more  likely  to  perform  in line with the
overall stock market.

PRICE/BOOK  RATIO.  The share price of a stock divided by
its net worth,  or book  value,  per share.  For a fund,  the  weighted  average
price/book ratio of the stocks it holds.

PRICE/EARNINGS  RATIO.  The ratio of a stock's  current  price to its  per-share
earnings over the past year. For a fund, the weighted  average P/E of the stocks
it holds. P/E is an indicator of market expectations about corporate  prospects;
the higher the P/E, the greater the expectations for a company's future growth.

R-SQUARED.  A measure of how much of a fund's past  returns can be  explained by
the returns from the overall market (or its benchmark  index). If a fund's total
return  were  precisely  synchronized  with the  overall  market's  return,  its
R-squared  would  be 1.00.  If a  fund's  returns  bore no  relationship  to the
market's returns, its R-squared would be 0.

RETURN ON  EQUITY.  The annual  average  rate of return  generated  by a company
during the past five years for each dollar of  shareholder's  equity (net income
divided by  shareholder's  equity).  For a fund, the weighted  average return on
equity for the companies whose stocks it holds.

SECTOR DIVERSIFICATION. The percentages of a fund's common stocks that come from
each of the major industry groups that compose the stock market.

TEN LARGEST STOCKS.  The percentage of equity assets that a fund has invested in
its ten largest stocks. As this percentage rises, a fund's returns are likely to
be more  volatile  because  they are more  dependent  on the  fortunes  of a few
companies.

TURNOVER RATE. An indication of trading  activity during the period.  Funds with
high  turnover  rates  incur  higher  transaction  costs and are more  likely to
distribute capital gains (which are taxable to investors).

                                       11

<PAGE>

FINANCIAL STATEMENTS
MARCH 31, 2000 (UNAUDITED)


STATEMENT OF NET ASSETS

This Statement  provides a detailed list of the fund's holdings,  including each
security's market value on the last day of the reporting period.  Securities are
grouped and  subtotaled by asset type (common  stocks,  bonds,  etc.),  with the
fund's S&P 500 Index  common  stocks  listed in  descending  market value order.
Other assets are added to, and  liabilities  are  subtracted  from, the value of
Total  Investments to calculate the fund's Net Assets.  Finally,  Net Assets are
divided by the  outstanding  shares of the fund to arrive at its share price, or
Net Asset Value (NAV) Per Share.

     At the end of the Statement of Net Assets, you will find a table displaying
the  composition  of the fund's net assets.  Because all income and any realized
gains must be  distributed  to  shareholders  each year,  the bulk of net assets
consists of Paid in Capital (money invested by shareholders).  The amounts shown
for  Undistributed  Net  Investment  Income and  Accumulated  Net Realized Gains
usually   approximate   the  sums  the  fund  had  available  to  distribute  to
shareholders as income  dividends or capital gains as of the statement date, but
may  differ  because  certain   investments  or  transactions   may  be  treated
differently  for  financial  statement  and tax purposes.  Any  Accumulated  Net
Realized Losses,  and any cumulative excess of distributions  over net income or
net realized gains, will appear as negative  balances.  Unrealized  Appreciation
(Depreciation)  is the  difference  between  the  market  value  of  the  fund's
investments  and their  cost,  and  reflects  the gains  (losses)  that would be
realized if the fund were to sell all of its investments at their statement-date
values.
- - - - - - - --------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
ASSET ALLOCATION FUND                          SHARES               (000)
- - - - - - - --------------------------------------------------------------------------------
COMMON STOCKS (31.0%)(1)
- - - - - - - --------------------------------------------------------------------------------
o Microsoft Corp.                           1,082,700           $  115,037
o Cisco Systems, Inc.                       1,425,600              110,217
  General Electric Co.                        684,200              106,179
  Intel Corp.                                 695,600               91,776
  Exxon Mobil Corp.                           720,120               56,034
  Wal-Mart Stores, Inc.                       928,000               51,504
o Oracle Corp.                                588,800               45,963
  International Business
    Machines Corp.                            375,300               44,285
  Citigroup, Inc.                             700,891               41,571
  Lucent Technologies, Inc.                   663,371               40,300
  Nortel Networks Corp.                       300,520               37,865
  AT&T Corp.                                  664,221               37,362
  American International
    Group, Inc.                               322,868               35,354
o America Online, Inc.                        465,400               31,298
  Home Depot, Inc.                            476,900               30,760
o Sun Microsystems, Inc.                      325,200               30,472
  Merck & Co., Inc.                           487,500               30,286
  SBC Communications Inc.                     711,414               29,879
  Pfizer, Inc.                                805,700               29,458
o Dell Computer Corp.                         529,400               28,554
  Hewlett-Packard Co.                         212,500               28,169
  Time Warner, Inc.                           268,300               26,830
o MCI WorldCom, Inc.                          590,966               26,778
  Texas Instruments, Inc.                     167,000               26,720
o EMC Corp.                                   213,412               26,676
  Royal Dutch Petroleum Co. ADR               444,700               25,598
  The Coca-Cola Co.                           515,100               24,177
  Bristol-Myers Squibb Co.                    412,760               23,837
o QUALCOMM, Inc.                              153,500               22,919
  Motorola, Inc.                              148,140               21,091
  Johnson & Johnson                           288,100               20,185
  Bell Atlantic Corp.                         322,230               19,696
  Morgan Stanley Dean
    Witter & Co.                              232,200               18,939
o Yahoo!, Inc.                                109,000               18,680
  Bank of America Corp.                       355,988               18,667
  BellSouth Corp.                             391,700               18,410
  The Walt Disney Co.                         430,100               17,795
  Tyco International Ltd.                     352,170               17,564
  Warner-Lambert Co.                          179,100               17,462
  Procter & Gamble Co.                        274,944               15,466
  The Chase Manhattan Corp.                   171,322               14,937
o Applied Materials, Inc.                     158,400               14,929
  American Home Products Corp.                272,900               14,634
  GTE Corp.                                   204,100               14,491
  Eli Lilly & Co.                             228,300               14,383
  Wells Fargo Co.                             343,610               14,066
  American Express Co.                         93,745               13,962
o Amgen, Inc.                                 213,000               13,073
  Medtronic, Inc.                             249,300               12,823
  Chevron Corp.                               135,200               12,497
  Fannie Mae                                  214,700               12,117
o Sprint PCS                                  178,900               11,684
  E.I. du Pont de Nemours & Co.               220,867               11,678
  Ford Motor Co.                              251,300               11,544
  Sprint Corp.                                180,200               11,353
  Abbott Laboratories                         320,600               11,281
  Schering-Plough Corp.                       304,300               11,183
  Enron Corp.                                 149,200               11,171

                                       12

  <PAGE>

- - - - - - - --------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
                                               SHARES               (000)
- - - - - - - --------------------------------------------------------------------------------
  Corning, Inc.                                57,500           $   11,155
o NEXTEL Communications, Inc.                  74,900               11,104
  General Motors Corp.                        133,531               11,058
  McDonald's Corp.                            283,100               10,634
  PepsiCo, Inc.                               307,500               10,628
  Philip Morris Cos., Inc.                    493,400               10,423
o MediaOne Group, Inc.                        126,030               10,208
  Charles Schwab Corp.                        169,250                9,615
  Compaq Computer Corp.                       353,848                9,421
o CBS Corp.                                   161,667                9,154
  Honeywell International Inc.                171,150                9,017
  The Gap, Inc.                               176,737                8,804
  Schlumberger Ltd.                           112,700                8,621
o Veritas Software Corp.                       64,564                8,458
  Gillette Co.                                223,700                8,431
o Comcast Corp.-Special Class A               193,000                8,371
  Bank One Corp.                              243,435                8,368
  Merrill Lynch & Co., Inc.                    76,000                7,980
  First Union Corp.                           205,932                7,671
o Viacom Inc. Class B                         143,800                7,585
  U S WEST, Inc.                              103,782                7,537
  Minnesota Mining &
   Manufacturing Co.                           84,700                7,501
o Micron Technology, Inc.                      56,200                7,081
  FleetBoston Financial Corp.                 189,037                6,900
  Colgate-Palmolive Co.                       121,900                6,872
  The Boeing Co.                              180,086                6,832
  Target Corp.                                 89,818                6,714
  Monsanto Co.                                130,000                6,695
  Computer Associates
   International, Inc.                        111,400                6,593
o Global Crossing Ltd.                        160,715                6,579
  The Bank of New York Co., Inc.              155,600                6,467
  Kimberly-Clark Corp.                        113,992                6,383
  Freddie Mac                                 144,200                6,372
  United Technologies Corp.                   100,000                6,319
  Electronic Data Systems Corp.                97,500                6,258
  Pharmacia & Upjohn, Inc.                    105,090                6,227
  Automatic Data Processing, Inc.             128,200                6,186
  Texaco Inc.                                 115,300                6,183
  Marsh & McLennan Cos., Inc.                  54,650                6,029
  Anheuser-Busch Cos., Inc.                    96,414                6,002
o Analog Devices, Inc.                         73,400                5,913
  Unilever NV ADR                             118,442                5,700
  Atlantic Richfield Co.                       66,400                5,644
o Xilinx, Inc.                                 67,200                5,565
  Alcoa Inc.                                   77,600                5,451
  Walgreen Co.                                209,300                5,389
o Tellabs, Inc.                                83,700                5,272
  The Seagram Co. Ltd.                         88,500                5,266
  Dow Chemical Co.                             45,850                5,227
o Network Appliance, Inc.                      62,800                5,197
o Solectron Corp.                             122,000                4,888
o Clear Channel
   Communications, Inc.                        70,200                4,848
  Emerson Electric Co.                         90,800                4,801
o Safeway, Inc.                               106,100                4,801
  J.P. Morgan & Co., Inc.                      36,242                4,775
  Firstar Corp.                               208,149                4,774
o Costco Wholesale Corp.                       89,512                4,705
  Lowe's Cos., Inc.                            79,700                4,652
o Apple Computer, Inc.                         34,000                4,618
o LSI Logic Corp.                              62,000                4,503
  MBNA Corp.                                  166,650                4,250
  PE Corp.-PE Biosystems Group                 43,500                4,198
  Gannett Co., Inc.                            58,700                4,131
  ALLTEL Corp.                                 65,500                4,131
o 3Com Corp.                                   73,500                4,088
  Fifth Third Bancorp                          64,350                4,054
  Allstate Corp.                              170,054                4,049
  First Data Corp.                             91,200                4,036
  Duke Energy Corp.                            74,081                3,889
  Williams Cos., Inc.                          87,700                3,853
  SunTrust Banks, Inc.                         65,600                3,788
  Baxter International, Inc.                   59,000                3,699
  International Paper Co.                      86,389                3,693
  Halliburton Co.                              90,000                3,690
  Eastman Kodak Co.                            67,900                3,688
o Guidant Corp.                                62,300                3,664
o Best Buy Co., Inc.                           42,300                3,638
  Household International, Inc.                97,088                3,623
o Gateway, Inc.                                66,900                3,546
  Xerox Corp.                                 135,996                3,536
  Omnicom Group Inc.                           37,000                3,457
  Illinois Tool Works, Inc.                    62,300                3,442
  U.S. Bancorp                                155,703                3,406
  Sara Lee Corp.                              188,700                3,397
o AES Corp.                                    43,000                3,386
  Conoco Inc. Class B                         131,939                3,381
o ADC Telecommunications, Inc.                 62,400                3,362
o Kohl's Corp.                                 32,200                3,301
  Washington Mutual, Inc.                     123,941                3,284
  Associates First Capital Corp.              149,912                3,214
  State Street Corp.                           33,000                3,197
  Mellon Financial Corp.                      108,300                3,195
o KLA-Tencor Corp.                             37,600                3,168
  Southern Co.                                145,200                3,158
  Carnival Corp.                              127,100                3,154
  Northern Trust Corp.                         45,900                3,101
  Columbia/HCA Healthcare Corp.               120,145                3,041
  CVS Corp.                                    80,600                3,028
o Comverse Technology, Inc.                    15,900                3,005
o The Kroger Co.                              169,100                2,970
  American General Corp.                       52,295                2,935
o Teradyne, Inc.                               35,600                2,928
  Caterpillar, Inc.                            74,200                2,926
o Conexant Systems, Inc.                       40,900                2,904
  Campbell Soup Co.                            94,200                2,897
  Linear Technology Corp.                      51,852                2,852
  Wachovia Corp.                               42,200                2,851
  PNC Financial Services Group                 62,800                2,830
  Adobe Systems, Inc.                          25,300                2,816
o Lexmark International
   Group, Inc. Class A                         26,600                2,813
  National City Corp.                         136,082                2,807
  Bestfoods                                    58,800                2,753
o Computer Sciences Corp.                      34,700                2,746
o Cendant Corp.                               148,234                2,742

                                       13

<PAGE>

- - - - - - - --------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
ASSET ALLOCATION FUND                          SHARES                (000)
- - - - - - - --------------------------------------------------------------------------------
  Albertson's, Inc.                            87,736           $    2,720
  Weyerhaeuser Co.                             47,700                2,719
  Interpublic Group of Cos., Inc.              56,100                2,651
  CIGNA Corp.                                  34,700                2,629
o Seagate Technology Inc.                      43,400                2,615
  Paychex, Inc.                                49,900                2,614
  Sysco Corp.                                  73,100                2,609
  H.J. Heinz Co.                               74,700                2,605
  The Hartford Financial Services
   Group Inc.                                  49,100                2,590
  Cardinal Health, Inc.                        56,050                2,571
o BMC Software, Inc.                           51,700                2,553
  Pitney Bowes, Inc.                           56,500                2,525
o Citrix Systems, Inc.                         37,900                2,511
  Sears, Roebuck & Co.                         81,100                2,504
  Harley-Davidson, Inc.                        31,400                2,492
  AFLAC, Inc.                                  54,700                2,492
  Providian Financial Corp.                    28,600                2,477
  Circuit City Stores, Inc.                    40,600                2,472
  Phillips Petroleum Co.                       53,300                2,465
  NIKE, Inc. Class B                           59,800                2,370
  Molex, Inc.                                  40,250                2,365
  The Chubb Corp.                              34,900                2,358
  Lehman Brothers Holdings, Inc.               24,300                2,357
  General Mills, Inc.                          64,300                2,327
o FedEx Corp.                                  59,220                2,310
  Transocean Sedco Forex Inc.                  43,207                2,217
o National Semiconductor Corp.                 36,500                2,213
  Kellogg Co.                                  85,300                2,186
  Burlington Northern
   Santa Fe Corp.                              98,696                2,184
o Biogen, Inc.                                 31,200                2,180
  Southwest Airlines Co.                      104,300                2,171
  General Dynamics Corp.                       43,400                2,159
  Tandy Corp.                                  41,128                2,087
  United Healthcare Corp.                      34,900                2,081
o Novell, Inc.                                 72,300                2,070
  Scientific-Atlanta, Inc.                     32,400                2,055
  Coastal Corp.                                44,000                2,024
  Rohm & Haas Co.                              45,239                2,019
  Dover Corp.                                  41,800                2,001
  Deere & Co.                                  52,300                1,987
  Kansas City Southern
   Industries, Inc.                            23,100                1,985
  Union Pacific Corp.                          50,600                1,980
  PPG Industries, Inc.                         37,600                1,967
  Dominion Resources, Inc.                     50,778                1,952
o Staples, Inc.                                97,400                1,948
  May Department Stores Co.                    68,300                1,947
  Baker Hughes, Inc.                           64,160                1,941
  Capital One Financial Corp.                  40,200                1,927
  El Paso Energy Corp.                         47,400                1,914
  Coca-Cola Enterprises, Inc.                  88,700                1,913
  Masco Corp.                                  91,800                1,882
  Delphi Automotive Systems Corp.             116,718                1,867
  Textron, Inc.                                30,500                1,857
o Boston Scientific Corp.                      86,500                1,844
  The McGraw-Hill Cos., Inc.                   40,400                1,838
  ConAgra, Inc.                               101,000                1,831
  Tribune Co.                                  49,900                1,824
o Advanced Micro Devices, Inc.                 31,700                1,809
  Wrigley, (Wm.) Jr. Co.                       23,500                1,805
  BB&T Corp.                                   64,300                1,804
  The Limited, Inc.                            42,688                1,798
o Federated Department
   Stores, Inc.                                42,100                1,758
  KeyCorp                                      91,800                1,744
  Ralston-Ralston Purina Group                 63,400                1,736
  Franklin Resources Corp.                     51,900                1,735
  Texas Utilities Co.                          57,641                1,711
  FPL Group, Inc.                              36,900                1,700
  Waste Management, Inc.                      123,910                1,696
  Aetna Inc.                                   30,406                1,693
  The Quaker Oats Co.                          27,700                1,679
  USX-Marathon Group                           64,000                1,668
  Aon Corp.                                    51,625                1,665
  PG&E Corp.                                   78,600                1,651
  Lockheed Martin Corp.                        80,482                1,645
o Unisys Corp.                                 64,500                1,645
  Marriott International, Inc.
   Class A                                     52,100                1,641
  Rockwell International Corp.                 39,200                1,639
  St. Paul Cos., Inc.                          47,856                1,633
  Burlington Resources, Inc.                   43,585                1,613
o Compuware Corp.                              76,300                1,607
  Unicom Corp.                                 43,500                1,588
  The Clorox Co.                               48,600                1,580
  Avon Products, Inc.                          54,200                1,575
  Alcan Aluminium Ltd.                         46,050                1,560
  Occidental Petroleum Corp.                   75,000                1,556
  Union Carbide Corp.                          26,400                1,539
  TRW, Inc.                                    25,900                1,515
  Hershey Foods Corp.                          30,900                1,506
  New York Times Co. Class A                   35,000                1,503
  Dollar General Corp.                         55,431                1,490
  Unocal Corp.                                 50,039                1,489
  Georgia Pacific Group                        37,600                1,488
  TJX Cos., Inc.                               66,700                1,480
  Avery Dennison Corp.                         24,100                1,472
  Public Service Enterprise
   Group, Inc.                                 49,600                1,469
  Ingersoll-Rand Co.                           33,150                1,467
  Reliant Energy, Inc.                         61,822                1,449
  Tenet Healthcare Corp.                       62,700                1,442
  Jefferson-Pilot Corp.                        21,600                1,438
  PECO Energy Corp.                            38,900                1,434
  Comerica, Inc.                               34,050                1,426
  Dow Jones & Co., Inc.                        19,700                1,415
  Lincoln National Corp.                       42,100                1,410
  Delta Air Lines, Inc.                        26,400                1,406
  Danaher Corp.                                27,500                1,403
  Newell Rubbermaid, Inc.                      55,909                1,387
  Consolidated Edison Inc.                     47,700                1,383
  Air Products & Chemicals, Inc.               48,100                1,368
  Allergan, Inc.                               26,700                1,335
  Archer-Daniels-Midland Co.                  128,434                1,333
  Praxair, Inc.                                31,700                1,320
  Becton, Dickinson & Co.                      49,900                1,313

                                       14

<PAGE>

- - - - - - - --------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
                                               SHARES                (000)
- - - - - - - --------------------------------------------------------------------------------
  PaineWebber Group, Inc.                       9,600           $    1,302
  Cincinnati Financial Corp.                   33,800                1,272
  Edison International                         74,700                1,237
  Raytheon Co. Class B                         69,700                1,237
  Amerada Hess Corp.                           19,000                1,228
o Parametric Technology Corp.                  58,000                1,222
  AmSouth Bancorp                              81,000                1,210
  Eaton Corp.                                  15,500                1,209
  Bear Stearns Co., Inc.                       26,187                1,195
  Barrick Gold Corp.                           75,600                1,186
  McKesson HBOC, Inc.                          55,965                1,175
  American Electric Power Co., Inc.            39,400                1,175
  IMS Health, Inc.                             69,300                1,174
  Loews Corp.                                  23,400                1,170
  SLM Holding Corp.                            35,000                1,166
  W.W. Grainger, Inc.                          21,400                1,161
  Apache Corp.                                 23,100                1,149
o Bed Bath & Beyond, Inc.                      29,000                1,142
  The Times Mirror Co. Class A                 12,200                1,134
  Norfolk Southern Corp.                       78,600                1,130
o PeopleSoft, Inc.                             56,000                1,120
  Progressive Corp. of Ohio                    14,600                1,111
o Cabletron Systems, Inc.                      37,700                1,105
  Golden West Financial Corp.                  35,200                1,098
  Huntington Bancshares Inc.                   47,807                1,070
  CenturyTel, Inc.                             28,550                1,060
  MGIC Investment Corp.                        24,000                1,047
  MBIA, Inc.                                   20,100                1,046
  CSX Corp.                                    44,400                1,043
  Champion International Corp.                 19,400                1,033
  Reynolds Metals Co.                          15,300                1,023
  Kerr-McGee Corp.                             17,597                1,016
  Entergy Corp.                                50,300                1,015
  Fort James Corp.                             45,800                1,008
  Synovus Financial Corp.                      53,350                1,007
  Dun & Bradstreet Corp.                       34,900                  999
o AMR Corp.                                    31,300                  998
  Regions Financial Corp.                      43,700                  997
  Columbia Energy Group                        16,800                  995
  T. Rowe Price                                25,200                  995
  Carolina Power & Light Co.                   30,500                  989
  Constellation Energy Group                   30,950                  987
o Tricon Global Restaurants, Inc.              31,700                  985
  FirstEnergy Corp.                            47,700                  984
  Ecolab, Inc.                                 26,700                  980
o Wellpoint Health
   Networks Inc. Class A                       14,000                  978
  Tosco Corp.                                  31,800                  968
  Knight Ridder                                18,900                  963
  H & R Block, Inc.                            21,500                  962
  Parker Hannifin Corp.                        23,125                  955
o Kmart Corp.                                  98,500                  954
  Vulcan Materials Co.                         20,800                  953
  Summit Bancorp                               36,100                  948
  Johnson Controls, Inc.                       17,300                  935
  Anadarko Petroleum Corp.                     24,100                  932
  Florida Progress Corp.                       20,100                  922
o Sealed Air Corp.                             16,915                  919
  Whirlpool Corp.                              15,600                  915
  Dana Corp.                                   32,359                  912
  Union Planters Corp.                         29,600                  912
  Mattel, Inc.                                 86,687                  905
o Office Depot, Inc.                           78,200                  904
  Willamette Industries, Inc.                  22,500                  903
  Nucor Corp.                                  17,800                  890
o Toys R Us, Inc.                              59,500                  881
  Leggett & Platt, Inc.                        40,900                  879
  Genuine Parts Co.                            36,650                  875
  Biomet, Inc.                                 24,000                  873
  SouthTrust Corp.                             34,300                  873
  Ameren Corp.                                 28,200                  872
  Fortune Brands, Inc.                         34,800                  870
o AutoZone Inc.                                30,800                  855
  DTE Energy Co.                               29,400                  853
  Phelps Dodge Corp.                           17,803                  846
  UnumProvident Corp.                          49,591                  843
  Sabre Holdings Corp.                         22,619                  835
o Adaptec, Inc.                                21,500                  830
  PACCAR, Inc.                                 16,440                  822
o NCR Corp.                                    20,000                  803
  Nordstrom, Inc.                              27,100                  799
  Old Kent Financial Corp.                     24,700                  798
  Sherwin-Williams Co.                         36,200                  794
  Brown-Forman Corp. Class B                   14,500                  789
o Watson Pharmaceuticals, Inc.                 19,800                  786
  International Flavors &
   Fragrances, Inc.                            22,400                  785
o ALZA Corp.                                   20,900                  785
  SAFECO Corp.                                 29,400                  781
  Nabisco Group Holdings Corp.                 64,900                  779
  Equifax, Inc.                                30,800                  778
  J.C. Penney Co., Inc.                        51,000                  759
  Black & Decker Corp.                         19,900                  747
  The Mead Corp.                               21,100                  737
  The Goodyear Tire & Rubber Co.               31,600                  737
  Union Pacific Resources
   Group, Inc.                                 50,622                  734
o Inco Ltd.                                    39,998                  732
  GPU, Inc.                                    26,700                  731
  Central & South West Corp.                   42,600                  727
  Conseco Inc.                                 63,545                  727
  Eastman Chemical Co.                         15,950                  726
  Northrop Grumman Corp.                       13,700                  725
  PPL Corp.                                    34,100                  714
  Sempra Energy                                42,592                  713
  Westvaco Corp.                               21,300                  711
  Newmont Mining Corp.                         31,546                  708
  Torchmark Corp.                              30,300                  701
  New Century Energies, Inc.                   22,900                  688
  Cinergy Corp.                                31,918                  686
o Mirage Resorts, Inc.                         35,400                  686
  Cooper Industries, Inc.                      19,557                  685
  Liz Claiborne, Inc.                          14,900                  683
  Young & Rubicam Inc.                         14,500                  682
  The BFGoodrich Co.                           22,800                  654
  R.R. Donnelley & Sons Co.                    31,100                  651
  Hasbro, Inc.                                 39,450                  651
  ITT Industries, Inc.                         20,600                  640

                                       15

<PAGE>

- - - - - - - --------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
ASSET ALLOCATION FUND                          SHARES                (000)
- - - - - - - --------------------------------------------------------------------------------
  Autodesk, Inc.                               13,900           $      632
  Bausch & Lomb, Inc.                          12,100                  631
o Thermo Electron Corp.                        30,900                  630
  Countrywide Credit
   Industries, Inc.                            23,100                  629
o Navistar International Corp.                 15,580                  625
  PerkinElmer, Inc.                             9,400                  625
o Ceridian Corp.                               32,500                  624
  Maytag Corp.                                 18,700                  619
  Tektronix, Inc.                              11,050                  619
  VF Corp.                                     25,528                  614
  Northern States Power Co.                    30,600                  608
  UST, Inc.                                    38,200                  597
  Winn-Dixie Stores, Inc.                      30,700                  597
  Hilton Hotels Corp.                          76,800                  595
  Darden Restaurants Inc.                      33,300                  593
o US Airways Group, Inc.                       21,200                  590
  Temple-Inland Inc.                           11,800                  588
  Sigma-Aldrich Corp.                          20,900                  562
  Placer Dome, Inc.                            67,600                  549
  Wendy's International, Inc.                  27,200                  549
  Harcourt General, Inc.                       14,663                  546
  Pall Corp.                                   24,266                  544
  SuperValu Inc.                               28,500                  540
o Owens-Illinois, Inc.                         31,900                  538
  Sunoco, Inc.                                 19,467                  533
  Fluor Corp.                                  17,100                  530
o Rowan Cos., Inc.                             17,900                  527
o Niagara Mohawk Holdings Inc.                 38,500                  520
  Ashland, Inc.                                15,500                  518
o Harrah's Entertainment, Inc.                 26,800                  497
  The Stanley Works                            18,800                  496
  Pinnacle West Capital Corp.                  17,500                  493
o HEALTHSOUTH Corp.                            88,100                  490
  Millipore Corp.                               8,600                  485
o Freeport-McMoRan Copper &
   Gold Inc. Class B                           40,000                  483
o St. Jude Medical, Inc.                       18,500                  478
  C.R. Bard, Inc.                              12,200                  472
  Engelhard Corp.                              30,850                  467
  Deluxe Corp.                                 17,300                  458
  USX-U.S. Steel Group                         17,940                  449
o FMC Corp.                                     7,800                  441
  Great Lakes Chemical Corp.                   12,800                  435
  Mallinckrodt, Inc.                           15,100                  434
o Andrew Corp.                                 18,275                  418
  Crown Cork & Seal Co., Inc.                  26,100                  418
  Allegheny Technologies Inc.                  20,555                  412
  Bemis Co., Inc.                              11,000                  406
o Quintiles Transnational Corp.                23,300                  398
  Dillard's Inc.                               23,900                  393
  Brunswick Corp.                              20,700                  392
o Silicon Graphics, Inc.                       36,646                  387
  Ryder System, Inc.                           16,700                  379
  Adolph Coors Co. Class B                      7,900                  378
  CMS Energy Corp.                             20,800                  377
  Boise Cascade Corp.                          10,300                  358
  NICOR, Inc.                                  10,800                  356
  Crane Co.                                    14,537                  343
  Snap-On Inc.                                 12,950                  339
  Hercules, Inc.                               20,900                  337
  Meredith Corp.                               11,700                  324
o Manor Care, Inc.                             23,200                  313
  Cummins Engine Co., Inc.                      8,300                  312
  Centex Corp.                                 13,000                  310
  Thomas & Betts Corp.                         10,900                  308
  Louisiana-Pacific Corp.                      22,100                  307
o Pactiv Corp.                                 34,500                  302
  Rite Aid Corp.                               53,100                  292
  American Greetings
   Corp. Class A                               15,700                  287
  Alberto-Culver Co. Class B                   11,800                  281
  Potlatch Corp.                                6,100                  262
o Allied Waste Industries, Inc.                38,900                  255
o Consolidated Stores, Inc.                    22,100                  251
  Shared Medical Systems Corp.                  4,800                  249
  Eastern Enterprises                           4,100                  245
  Homestake Mining Co.                         40,900                  245
  Worthington Industries, Inc.                 19,550                  242
o Humana, Inc.                                 32,800                  240
  Briggs & Stratton Corp.                       5,800                  239
  Polaroid Corp.                                9,762                  232
  Pulte Corp.                                  10,900                  228
  Jostens Inc.                                  9,000                  219
  Ball Corp.                                    6,300                  218
  Cooper Tire & Rubber Co.                     17,300                  217
  National Service Industries, Inc.            10,200                  215
  The Timken Co.                               13,000                  211
  Owens Corning                                10,400                  202
  Peoples Energy Corp.                          7,300                  200
  Tupperware Corp.                             12,500                  198
  Longs Drug Stores, Inc.                       8,500                  193
o W.R. Grace & Co.                             15,100                  192
  IKON Office Solutions, Inc.                  25,800                  160
  Great Atlantic & Pacific
   Tea Co., Inc.                                8,000                  156
  Kaufman & Broad Home Corp.                    6,900                  148
  Armstrong World Industries Inc.               8,200                  147
  ONEOK, Inc.                                   5,800                  145
  Springs Industries Inc. Class A               3,800                  144
o Bethlehem Steel Corp.                        23,500                  141
  Russell Corp.                                 8,400                  120
  Milacron Inc.                                 7,500                  108
o Reebok International Ltd.                    11,600                  107
  McDermott International, Inc.                11,400                  105
  NACCO Industries, Inc. Class A                1,760                   84
  Arch Coal, Inc.                               3,815                   27
o Siebel Systems, Inc.                            204                   24
- - - - - - - --------------------------------------------------------------------------------
TOTAL COMMON STOCKS
  (COST $1,012,717)                                              2,651,581
- - - - - - - --------------------------------------------------------------------------------






                                               FACE
                                             AMOUNT
                                              (000)
- - - - - - - --------------------------------------------------------------------------------
U.S. GOVERNMENT OBLIGATIONS (58.3%)
- - - - - - - --------------------------------------------------------------------------------
U.S. TREASURY BONDS
  5.25%, 11/15/2028                          $154,760              138,564
  5.25%, 2/15/2029                             65,000               58,292
  5.50%, 8/15/2028                            266,030              246,844
  6.125%, 11/15/2027                          163,410              165,023

                                       16

<PAGE>

- - - - - - - --------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
                                                (000)                (000)
- - - - - - - --------------------------------------------------------------------------------
  6.125%, 8/15/2029                          $ 37,500           $   38,269
  6.375%, 8/15/2027                           214,210              223,115
  6.50%, 11/15/2026                           206,160              217,528
  6.875%, 8/15/2025                           110,715              121,649
  7.125%, 2/15/2023                           393,345              439,964
  7.25%, 5/15/2016                            140,550              155,295
  7.50%, 11/15/2016                            73,440               83,166
  7.50%, 11/15/2024                            96,490              113,294
  7.625%, 11/15/2022                           87,370              102,939
  7.625%, 2/15/2025                            72,585               86,528
(2)8.00%, 11/15/2021                          162,520              197,886
  8.125%, 8/15/2019                            86,720              105,424
(2)8.125%, 5/15/2021                          202,095              248,138
  8.125%, 8/15/2021                           151,830              186,669
  8.50%, 2/15/2020                            172,034              216,930
  8.75%, 5/15/2017                            189,830              239,822
  8.75%, 5/15/2020                             84,400              108,968
  8.75%, 8/15/2020                            132,500              171,379
  8.875%, 8/15/2017                           207,560              265,430
  8.875%, 2/15/2019                           173,460              224,414
  10.375%, 11/15/2012                         129,608              159,525
  10.625%, 8/15/2015                           82,260              117,472
  11.25%, 2/15/2015                            87,300              129,037
  11.75%, 11/15/2014                          104,775              144,300
  12.00%, 8/15/2013                           186,435              252,053
  12.75%, 11/15/2010                            7,220                9,288
  14.00%, 11/15/2011                           17,300               24,178
- - - - - - - --------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT OBLIGATIONS
  (COST $5,070,475)                                              4,991,383
- - - - - - - --------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (14.6%)(1)
- - - - - - - --------------------------------------------------------------------------------
COMMERCIAL PAPER (5.2%)
AIG Funding Inc.
  5.86%, 5/18/2000                             24,000               23,820
Coca-Cola Co.
  5.72%, 4/28/2000                             30,000               29,874
  6.03%, 6/5/2000                              50,000               49,456
E.I. du Pont de Nemours & Co.
  5.904%, 4/27/2000                            50,000               49,800
  6.04%,  6/5/2000                             30,000               29,673
Ford Motor Credit Co.
  5.99%, 6/14/2000                             80,000               79,015
General Electric Capital Corp.
  5.91%, 6/2/2000                              25,000               24,749
General Motors Acceptance Corp.
  6.05%, 6/6/2000                              80,000               79,113
International Lease Finance Corp.
  5.90%, 5/15/2000                             80,000               79,439
                                                                  --------
                                                                   444,939
                                                                  --------


- - - - - - - --------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
                                                (000)                (000)
- - - - - - - --------------------------------------------------------------------------------
REPURCHASE AGREEMENTS (9.4%)
Collateralized by U.S. Government
     Obligations in a Pooled
     Cash Account
     6.12%, 4/3/2000                         $395,161          $   395,161
     6.14%, 4/3/2000--Note F                  405,520              405,520
                                                                   -------
                                                                   800,681
                                                                   -------
- - - - - - - --------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
  (COST $1,245,586)                                              1,245,620
- - - - - - - --------------------------------------------------------------------------------
TOTAL INVESTMENTS (103.9%)
  (COST $7,328,778)                                              8,888,584
- - - - - - - --------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-3.9%)
- - - - - - - --------------------------------------------------------------------------------
Other Assets--Note C                                              100,465
Security Lending Collateral Payable
     to Brokers--Note F                                          (405,520)
                                                                 ---------
Other Liabilities                                                 (31,220)
                                                                 ---------
                                                                 (336,275)
                                                                 ---------
- - - - - - - --------------------------------------------------------------------------------
NET ASSETS (100%)
- - - - - - - --------------------------------------------------------------------------------
Applicable to 340,158,990 outstanding $0.001
  par value shares of beneficial interest
  (unlimited authorization)                                    $8,552,309
================================================================================
NET ASSET VALUE PER SHARE                                          $25.14
================================================================================
 *See Note A in Notes to  Financial  Statements.
 oNon-Income-Producing Security.
(1)The fund invests a portion of its cash reserves in equity markets through the
use of index futures contracts. After giving effect to futures investments,  the
fund's effective common stock and temporary cash investment  positions represent
40.5% and 5.1%,  respectively,  of net assets.  See Note E in Notes to Financial
Statements.
(2)Securities  with an aggregate  value of $97,920,000  have been  segregated as
initial margin for open futures contracts. ADR--American Depositary Receipt.










- - - - - - - --------------------------------------------------------------------------------
AT MARCH 31, 2000, NET ASSETS CONSISTED OF:
- - - - - - - --------------------------------------------------------------------------------
                                               AMOUNT                  PER
                                                (000)                SHARE
- - - - - - - --------------------------------------------------------------------------------
Paid in Capital                            $6,690,600               $19.67
Undistributed Net
  Investment Income                            82,986                  .24
Accumulated Net
  Realized Gains                              155,036                  .46
Unrealized Appreciation--Note E
  Investment Securities                     1,559,806                 4.58
  Futures Contracts                            63,881                  .19
- - - - - - - --------------------------------------------------------------------------------
NET ASSETS                                 $8,552,309               $25.14
================================================================================

                                       17

<PAGE>

STATEMENT OF OPERATIONS

This Statement  shows dividend and interest income earned by the fund during the
reporting period,  and details the operating expenses charged to the fund. These
expenses  directly  reduce the amount of investment  income  available to pay to
shareholders  as  dividends.  This  Statement  also  shows  any Net Gain  (Loss)
realized  on the  sale of  investments,  and the  increase  or  decrease  in the
Unrealized Appreciation  (Depreciation) on investments during the period. If the
fund  invested  in futures  contracts  during the  period,  the results of these
investments are shown separately.

- - - - - - - --------------------------------------------------------------------------------
                                                           ASSET ALLOCATION FUND
                                                 SIX MONTHS ENDED MARCH 31, 2000
                                                                           (000)
- - - - - - - --------------------------------------------------------------------------------
INVESTMENT INCOME
INCOME
    Dividends                                                          $ 16,714
    Interest                                                            175,479
    Security Lending                                                        428
                                                                       ---------
       Total Income                                                     192,621
                                                                       ---------
EXPENSES
   Investment Advisory Fees--Note B
       Basic Fee                                                          4,563
       Performance Adjustment                                              (709)
   The Vanguard Group--Note C
       Management and Administrative                                     14,929
       Marketing and Distribution                                           660
   Custodian Fees                                                            44
   Auditing Fees                                                             16
   Shareholders' Reports                                                    111
   Trustees' Fees and Expenses                                                5
                                                                       ---------
       Total Expenses                                                    19,619
- - - - - - - --------------------------------------------------------------------------------
NET INVESTMENT INCOME                                                   173,002
- - - - - - - --------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)
   Investment Securities Sold                                           180,960
   Futures Contracts                                                     (1,805)
- - - - - - - --------------------------------------------------------------------------------
REALIZED NET GAIN                                                       179,155
- - - - - - - --------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)
   Investment Securities                                                394,768
   Futures Contracts                                                    115,289
- - - - - - - --------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)                        510,057
- - - - - - - --------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                   $862,214
================================================================================

                                     18

<PAGE>

STATEMENT OF CHANGES IN NET ASSETS

This Statement shows how the fund's total net assets changed during the two most
recent reporting periods. The Operations section summarizes information detailed
in  the  Statement  of  Operations.   The  amounts  shown  as  Distributions  to
shareholders  from the fund's net  income  and  capital  gains may not match the
amounts shown in the Operations section, because distributions are determined on
a tax  basis  and may be made in a period  different  from the one in which  the
income was earned or the gains were  realized on the financial  statements.  The
Capital Share Transactions section shows the amount shareholders invested in the
fund,  either by purchasing shares or by reinvesting  distributions,  as well as
the amounts redeemed.  The  corresponding  numbers of Shares Issued and Redeemed
are shown at the end of the Statement.
<TABLE>
<CAPTION>

- - - - - - - -----------------------------------------------------------------------------------------------------------
                                                                                   ASSET ALLOCATION FUND
                                                                          ----- ---------------------------
                                                                             SIX MONTHS                YEAR
                                                                                  ENDED               ENDED
                                                                          MAR. 31, 2000       SEP. 30, 1999
                                                                                  (000)               (000)
- - - - - - - -----------------------------------------------------------------------------------------------------------
<S>                                                                               <C>                 <C>

INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
   Net Investment Income                                                   $   173,002         $   261,315
   Realized Net Gain                                                           179,155             477,764
   Change in Unrealized Appreciation (Depreciation)                            510,057             102,998
                                                                           --------------------------------
      Net Increase in Net Assets Resulting from Operations                     862,214             842,077
                                                                           --------------------------------
DISTRIBUTIONS
    Net Investment Income                                                     (182,342)           (263,532)
    Realized Capital Gain                                                     (330,279)           (308,685)
                                                                           --------------------------------
      Total Distributions                                                     (512,621)           (572,217)
                                                                           --------------------------------
CAPITAL SHARE TRANSACTIONS1
     Issued                                                                    953,909           3,038,828
     Issued in Lieu of Cash Distributions                                      493,894             550,958
     Redeemed                                                               (1,427,208)         (1,314,040)
                                                                           --------------------------------
        Net Increase from Capital Share Transactions                            20,595           2,275,746
- - - - - - - -----------------------------------------------------------------------------------------------------------
     Total Increase                                                            370,188           2,545,606
- - - - - - - -----------------------------------------------------------------------------------------------------------
NET ASSETS
    Beginning of Period                                                      8,182,121           5,636,515
                                                                           --------------------------------
    End of Period                                                           $8,552,309          $8,182,121
===========================================================================================================

1Shares Issued (Redeemed)
    Issued                                                                      39,569             123,320
    Issued in Lieu of Cash Distributions                                        20,682              23,236
    Redeemed                                                                   (59,477)            (53,361)
                                                                           --------------------------------
       Net Increase in Shares Outstanding                                          774              93,195
===========================================================================================================
</TABLE>

                                     19
<PAGE>

FINANCIAL HIGHLIGHTS

This table  summarizes  the  fund's  investment  results  and  distributions  to
shareholders on a per-share  basis. It also presents the fund's Total Return and
shows net  investment  income and expenses as percentages of average net assets.
These data will help you assess:  the  variability  of the fund's net income and
total returns from year to year;  the relative  contributions  of net income and
capital gains to the fund's total return; how much it costs to operate the fund;
and the extent to which the fund tends to distribute  capital  gains.  The table
also  shows the  Portfolio  Turnover  Rate,  a measure of  trading  activity.  A
turnover  rate of 100% means that the  average  security is held in the fund for
one year.
<TABLE>
<CAPTION>

- - - - - - - ---------------------------------------------------------------------------------------------------------------
                                                                       ASSET ALLOCATION FUND
                                                                       YEAR ENDED SEPTEMBER 30,
FOR A SHARE OUTSTANDING               SIX MONTHS ENDED    -----------------------------------------------------
THROUGHOUT EACH PERIOD                 MARCH 31, 2000         1999        1998       1997      1996      1995
- - - - - - - ---------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>         <C>        <C>       <C>       <C>
NET ASSET VALUE, BEGINNING OF PERIOD            $24.11       $22.90      $21.53     $18.27    $17.03    $13.78
- - - - - - - ---------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
     Net Investment Income                         .50          .80         .79        .74       .69       .64
     Net Realized and Unrealized Gain
         (Loss) on Investments                    2.02         2.50        2.33       4.29      1.82      3.18
                                              -----------------------------------------------------------------
         Total from Investment Operations         2.52         3.30        3.12       5.03      2.51      3.82
                                              -----------------------------------------------------------------
DISTRIBUTIONS
     Dividends from Net Investment Income         (.53)        (.91)       (.74)      (.72)     (.66)     (.57)
     Distributions from Realized Capital Gains    (.96)       (1.18)      (1.01)     (1.05)     (.61)
                                              -----------------------------------------------------------------
        Total Distributions                      (1.49)       (2.09)      (1.75)     (1.77)    (1.27)     (.57)
- - - - - - - ---------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                  $25.14       $24.11      $22.90     $21.53    $18.27    $17.03
===============================================================================================================

TOTAL RETURN                                    10.78%       14.68%      15.24%     29.42%    15.27%    28.57%
===============================================================================================================

RATIOS/SUPPLEMENTAL DATA
     Net Assets, End of Period (Millions)       $8,552       $8,182      $5,637     $3,738    $2,341    $1,593
     Ratio of Total Expenses to
         Average Net Assets                     0.47%*        0.49%       0.49%      0.49%     0.47%     0.49%
     Ratio of Net Investment Income to
         Average Net Assets                     4.11%*        3.49%       3.80%      3.96%     4.17%     4.41%
     Portfolio Turnover Rate                      31%*          11%         60%        10%       47%       34%
===============================================================================================================
</TABLE>

*Annualized.

                                       20
<PAGE>



NOTES TO FINANCIAL STATEMENTS

Vanguard Asset Allocation Fund is registered under the Investment Company Act of
1940 as a diversified open-end investment company, or mutual fund.

A. The following  significant  accounting policies conform to generally accepted
accounting  principles  for mutual  funds.  The fund  consistently  follows such
policies in preparing its financial statements.

     1. SECURITY  VALUATION:  Equity  securities are valued at the latest quoted
sales  prices  as of the  close  of  trading  on the  New  York  Stock  Exchange
(generally  4:00 p.m.  Eastern time) on the valuation  date; such securities not
traded on the valuation date are valued at the mean of the latest quoted bid and
asked  prices.  Prices are taken from the primary  market in which each security
trades. Bonds, and temporary cash investments acquired over 60 days to maturity,
are valued  using the latest  bid prices or using  valuations  based on a matrix
system (which considers such factors as security prices, yields, maturities, and
ratings),  both as furnished by independent  pricing  services.  Other temporary
cash investments are valued at amortized cost, which approximates  market value.
Securities for which market  quotations are not readily  available are valued by
methods deemed by the Board of Trustees to represent fair value.

     2.  FEDERAL  INCOME  TAXES:  The fund  intends to  continue to qualify as a
regulated   investment  company  and  distribute  all  of  its  taxable  income.
Accordingly,  no provision for federal income taxes is required in the financial
statements.

     3.  REPURCHASE  AGREEMENTS:  The fund,  along  with  other  members  of The
Vanguard  Group,  transfers  uninvested  cash balances to a Pooled Cash Account,
which  is  invested  in  repurchase   agreements  secured  by  U.S.   government
securities.  Securities pledged as collateral for repurchase agreements are held
by a custodian bank until the agreements  mature.  Each agreement  requires that
the market value of the  collateral be sufficient to cover  payments of interest
and principal; however, in the event of default or bankruptcy by the other party
to  the  agreement,  retention  of  the  collateral  may  be  subject  to  legal
proceedings.

     4. FUTURES CONTRACTS:  The fund uses S&P 500 Index futures contracts,  with
the  objectives of  maintaining  full  exposure to the stock  market,  enhancing
returns,  maintaining liquidity,  and minimizing transaction costs. The fund may
purchase futures contracts to immediately invest incoming cash in the market, or
sell futures in response to cash outflows,  thereby  simulating a fully invested
position in the underlying index while maintaining a cash balance for liquidity.
The fund may seek to enhance returns by using futures  contracts  instead of the
underlying  securities when futures are believed to be priced more  attractively
than the underlying  securities.  The primary risks  associated  with the use of
futures contracts are imperfect  correlation between changes in market values of
stocks held by the fund and the prices of futures contracts, and the possibility
of an illiquid market.

     Futures contracts are valued at their quoted daily settlement  prices.  The
aggregate  principal  amounts of the contracts are not recorded in the financial
statements.  Fluctuations  in the value of the  contracts  are  recorded  in the
Statement  of Net  Assets  as an  asset  (liability)  and in  the  Statement  of
Operations as  unrealized  appreciation  (depreciation)  until the contracts are
closed, when they are recorded as realized futures gains (losses).

     5.  DISTRIBUTIONS:  Distributions  to  shareholders  are  recorded  on  the
ex-dividend  date.  Distributions  are  determined on a tax basis and may differ
from net investment  income and realized  capital gains for financial  reporting
purposes.

     6. OTHER:  Dividend  income is recorded on the ex-dividend  date.  Security
transactions  are accounted for on the date securities are bought or sold. Costs
used to determine  realized gains (losses) on the sale of investment  securities
are those of the  specific  securities  sold.  Premiums  and  discounts  on debt
securities  purchased  are amortized  and  accreted,  respectively,  to interest
income over the lives of the respective securities.

                                       21
<PAGE>
NOTES TO FINANCIAL STATEMENTS (CONTINUED)

B. Mellon Capital Management  Corporation  provides investment advisory services
to the fund for a fee  calculated  at an annual  percentage  rate of average net
assets.  The basic fee is subject to quarterly  adjustments based on performance
for the preceding  three years relative to a combined  index  comprising the S&P
500 Index and the Lehman  Brothers Long U.S.  Treasury  Bond Index.  For the six
months ended March 31, 2000, the advisory fee  represented  an effective  annual
basic  rate of 0.11% of the fund's  average  net  assets  before a  decrease  of
$709,000 (0.02%) based on performance.

C. The Vanguard Group  furnishes at cost corporate  management,  administrative,
marketing,  and distribution  services. The costs of such services are allocated
to the fund  under  methods  approved  by the  Board of  Trustees.  The fund has
committed to provide up to 0.40% of its net assets in capital  contributions  to
Vanguard.  At March 31, 2000, the fund had contributed  capital of $1,647,000 to
Vanguard (included in Other Assets), representing 0.02% of the fund's net assets
and 1.6% of Vanguard's capitalization. The fund's Trustees and officers are also
Directors and officers of Vanguard.

D. During the six months ended March 31, 2000, the fund  purchased  $119,491,000
of investment securities and sold $832,151,000 of investment  securities,  other
than U.S.  government  securities and temporary cash investments.  Purchases and
sales  of U.S.  government  securities  were  $1,157,666,000  and  $345,449,000,
respectively.

E. At March 31, 2000, net unrealized  appreciation of investment  securities for
financial   reporting  and  federal  income  tax  purposes  was  $1,559,806,000,
consisting of unrealized gains of $1,709,290,000 on securities that had risen in
value since their purchase and  $149,484,000 in unrealized  losses on securities
that had fallen in value since their purchase.

     At March 31, 2000, the aggregate settlement value of open futures contracts
expiring in June 2000 and the related unrealized appreciation were:

- - - - - - - --------------------------------------------------------------------------------
                                                          (000)
                                             -----------------------------------
                                                 AGGREGATE
                      NUMBER  OF                 SETTLEMENT        UNREALIZED
FUTURES CONTRACTS    LONG CONTRACTS                VALUE          APPRECIATION
- - - - - - - --------------------------------------------------------------------------------
 S&P 500 Index          2,139                     $810,307           $63,881
- - - - - - - --------------------------------------------------------------------------------


F. The market value of securities on loan to  broker/dealers  at March 31, 2000,
was  $542,625,000,  for  which  the  fund had  received  as  collateral  cash of
$405,520,000 and U.S.  Treasury  securities with a market value of $145,938,000.
Cash collateral  received is invested in repurchase  agreements.  Security loans
are  required  to be secured at all times by  collateral  at least  equal to the
market  value  of  securities  loaned;  however,  in the  event  of  default  or
bankruptcy by the other party to the agreement,  retention of the collateral may
be subject to legal proceedings.

                                       22
<PAGE>

THE VANGUARD(R) FAMILY OF FUNDS

STOCK FUNDS
- - - - - - - ----------------------------------------
500 Index Fund
Aggressive Growth Fund
Capital Opportunity Fund
Convertible Securities Fund
Emerging  Markets Stock
 Index Fund
Energy Fund
Equity Income Fund
European Stock Index Fund
Explorer(TM) Fund
Extended Market Index Fund*
Global Equity Fund
Gold and  Precious  Metals Fund
Growth and Income Fund
Growth Index Fund*
Health Care Fund
Institutional  Index Fund*
International  Growth Fund
International  Value Fund
Mid-Cap  Index  Fund*
Morgan(TM)  Growth  Fund
Pacific  Stock Index Fund
PRIMECAP Fund
REIT Index Fund
Selected Value Fund
Small-Cap  Growth Index Fund*
Small-Cap  Index  Fund*
Small-Cap   Value  Index  Fund*
Tax-Managed   Capital
 Appreciation Fund*
Tax-Managed Growth and
  Income Fund*
Tax-Managed International Fund*
Tax-Managed  Small-Cap Fund*
Total  International  Stock
  Index Fund
Total Stock  Market  Index Fund*
U.S.  Growth Fund
Utilities  Income Fund
Value Index Fund*
Windsor(TM) Fund
Windsor(TM) II Fund

BALANCED FUNDS
- - - - - - - ----------------------------------------
Asset Allocation Fund
Balanced Index Fund
Global  Asset   Allocation  Fund
LifeStrategy(R)   Conservative
 Growth  Fund
LifeStrategy(R) Growth Fund
LifeStrategy(R) Income Fund
LifeStrategy(R) Moderate
 Growth Fund
STAR(TM) Fund
Tax-Managed  Balanced Fund
Wellesley(R)  Income Fund
Wellington(TM) Fund

BOND FUNDS
- - - - - - - ----------------------------------------
Admiral(TM)  Intermediate-Term
 Treasury Fund
Admiral(TM) Long-Term Treasury
 Fund
Admiral(TM)  Short-Term  Treasury
  Fund
GNMA  Fund
High-Yield  Corporate  Fund
High-Yield  Tax-Exempt Fund
Insured Long-Term Tax-Exempt
 Fund
Intermediate-Term Bond
 Index Fund
Intermediate-Term  Corporate Fund
Intermediate-Term  Tax-Exempt
 Fund
Intermediate-Term Treasury Fund
Limited-Term Tax-Exempt Fund
Long-Term Bond Index Fund
Long-Term Corporate Fund
Long-Term Tax-Exempt Fund
Long-Term Treasury Fund
Preferred Stock Fund
Short-Term Bond Index Fund
Short-Term  Corporate Fund*
Short-Term  Federal Fund
Short-Term  Tax-Exempt  Fund
Short-Term  Treasury Fund
State Tax-Exempt Bond Funds
(California,  Florida,
 Massachusetts, New Jersey,
 New York, Ohio, Pennsylvania)
Total Bond Market Index Fund*

MONEY MARKET FUNDS
- - - - - - - ----------------------------------------
Admiral(TM) Treasury Money
 Market Fund
Federal Money Market Fund
Prime Money Market Fund*
State Tax-Exempt Money Market
 Funds (California, New Jersey,
 New York, Ohio, Pennsylvania)
Tax-Exempt Money Market Fund
Treasury Money Market Fund









VARIABLE ANNUITY PLAN
- - - - - - - ----------------------------------------
Balanced  Portfolio
Diversified  Value Portfolio
Equity Income Portfolio
Equity Index  Portfolio
Growth  Portfolio
High-Grade  Bond  Portfolio
High Yield Bond Portfolio
International Portfolio
Mid-Cap Index Portfolio
Money Market Portfolio
REIT  Index  Portfolio
Short-Term  Corporate  Portfolio
Small  Company  Growth Portfolio

*Offers Institutional Shares.

For information  about Vanguard funds and our variable  annuity plan,  including
charges and  expenses,
obtain a prospectus  from The Vanguard  Group,  P.O. Box 2600,  Valley Forge,
PA 19482-2600.
Read it carefully before you invest or send money.

                                       23

<PAGE>

- - - - - - - --------------------------------------------------------------------------------
THE PEOPLE WHO GOVERN YOUR FUND

The  Trustees of your mutual fund are there to see that the fund is operated and
managed in your best interests  since,  as a shareholder,  you are part owner of
the fund.  Your  fund  Trustees  also  serve on the  Board of  Directors  of The
Vanguard  Group,  which is owned by the  funds  and  exists  solely  to  provide
services to them on an at-cost basis.

     Seven of Vanguard's eight board members are independent,  meaning that they
have no  affiliation  with  Vanguard or the funds they  oversee,  apart from the
sizable personal investments they have made as private  individuals.  They bring
distinguished  backgrounds  in business,  academia,  and public service to their
task of working with Vanguard officers to establish the policies and oversee the
activities of the funds.

     Among board members' responsibilities are selecting investment advisers for
the  funds;  monitoring  fund  operations,  performance,  and  costs;  reviewing
contracts;  nominating  and  selecting  new  Trustees/Directors;   and  electing
Vanguard officers.

     The list below provides a brief description of each Trustee's  professional
affiliations.  Noted in  parentheses is the year in which the Trustee joined the
Vanguard Board.

TRUSTEES

JOHN J. BRENNAN  (1987)  Chairman of the Board,  Chief  Executive  Officer,  and
Director/Trustee  of The  Vanguard  Group,  Inc.,  and  each  of the  investment
companies in The Vanguard Group.

JOANN HEFFERNAN HEISEN (1998) Vice President,  Chief Information  Officer, and a
member of the  Executive  Committee of Johnson & Johnson;  Director of Johnson &
Johnsono  Merck Consumer  Pharmaceuticals  Co., The Medical Center at Princeton,
and Women's Research and Education Institute.

BRUCE K.  MACLAURY  (1990)  President  Emeritus  of The  Brookings  Institution;
Director of  American  Express  Bank Ltd.,  The St. Paul  Companies,  Inc.,  and
National Steel Corp.

BURTON G. MALKIEL  (1977)  Chemical  Bank  Chairman's  Professor  of  Economics,
Princeton  University;  Director of Prudential  Insurance Co. of America,  Banco
Bilbao Gestinova,  Baker Fentress & Co., The Jeffrey Co., and Select Sector SPDR
Trust.

ALFRED M. RANKIN, JR. (1993) Chairman,  President,  Chief Executive Officer, and
Director of NACCO Industries, Inc.; Director of The BFGoodrich Co.

JOHN C.  SAWHILL  (1991)  President  and Chief  Executive  Officer of The Nature
Conservancy;  formerly,  Director  and  Senior  Partner  of  McKinsey  & Co. and
President  of New York  University;  Director of Pacific Gas and  Electric  Co.,
Procter & Gamble Co., NACCO Industries, and Newfield Exploration Co.

JAMES O.WELCH, JR. (1971) Retired Chairman of Nabisco Brands, Inc.; retired Vice
Chairman and Director of RJR Nabisco;  Director of TECO Energy,  Inc., and Kmart
Corp.

J.  LAWRENCE  WILSON  (1985)  Retired  Chairman of Rohm & Haas Co.;  Director of
AmeriSource Health Corporation,  Cummins Engine Co., and The Mead Corp.; Trustee
of Vanderbilt University.
- - - - - - - --------------------------------------------------------------------------------

OTHER FUND OFFICERS

RAYMOND J. KLAPINSKY Secretary;  Managing Director and Secretary of The Vanguard
Group,  Inc.;  Secretary  of each of the  investment  companies  in The Vanguard
Group.

THOMAS J. HIGGINS Treasurer; Principal of The Vanguard Group, Inc.; Treasurer of
each of the investment companies in The Vanguard Group.


VANGUARD MANAGING DIRECTORS

R. GREGORY BARTON  Legal Department.

ROBERT A. DISTEFANO  Information Technology.

JAMES H. GATELY  Individual Investor Group.

KATHLEEN C. GUBANICH  Human Resources.

IAN A. MACKINNON  Fixed Income Group.

F. WILLIAM MCNABB, III  Institutional Investor Group.

MICHAEL S. MILLER  Planning and Development.

RALPH K. PACKARD  Chief Financial Officer.

GEORGE U. SAUTER  Quantitative Equity Group.

<PAGE>

[SHIP LOGO]
[THE VANGUARD GROUP(R) LOGO]
Post Office Box 2600
Valley Forge, Pennsylvania 19482-2600

ABOUT OUR COVER

Our cover art, depicting HMS Vanguard at sea, is a
reproduction  of Leading the Way, a 1984 work created
and copyrighted by noted naval artist Tom Freeman,
of Forest Hill, Maryland.

WORLD WIDE WEB
www.vanguard.com

FUND INFORMATION
1-800-662-7447

INDIVIDUAL ACCOUNT SERVICES
1-800-662-2739

INSTITUTIONAL INVESTOR SERVICES
1-800-523-1036


This report is intended for the fund's
shareholders.  It may not be distributed
to  prospective  investors  unless it
is preceded or  accompanied by the
current fund prospectus.



Q782-042000

(C)2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing
Corporation, Distributor.





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