Mr. Bogle believes that a simple portfolio including only two funds, the VanguardTotalStockMarketIndexFund and Total Bond MarketIndexFund would be sufficient for many investors.
To show this, I created and rebalanced several portfolios using the VanguardTotalStockMarketIndexFund Admiral Shares (VTSAX) and the VanguardTotal Bond MarketIndexFund Admiral Shares (VBTLX).