The iShares Russell 1000 Growth Index Fund (Ticker: IW ) seeks investment results that, before fees and expenses, correspond generally to the performance of the Russell Growth 2000 Index, which is a style-set of the Russell 1000 Index of large cap stocks. Companies in the index are ranked by two variables: the price-to-book ratio and the I/B/E/S forecast long-term growth mean. Variables are combined to create a composite value score (CVS) for each stock. Rank the stocks by their CVS and apply a algorithm to the distribution to determine style membership weights. 70% are classified as all value or all growth and 30% are weighted proportionately to both value & growth.