The PowerShares FTSE RAFI US 1000 Portfolio (Fund) is based on the FTSE RAFI US 1000 Index (Index). The Fund will normally invest at least 90% of its total assets in common stocks that comprise the Index. The Index is designed to track the performance of the largest US equities, selected based on the following four fundamental measures of firm size: book value, cash flow, sales and dividends. The 1,000 equities with the highest fundamental strength are weighted by their fundamental scores. The Fund and the Index are reconstituted annually.