A method for selecting investment assets for a portfolio is based upon a score derived for each asset which is indicative of its style, for example, whether a stock is predominantly a growth or a value stock. Different sets of score factors are designated for assessing an asset's score with respect to a first characteristic, or style, indicated by one set of score factors and with respect to a second characteristic, or style, indicated by the second set of factors. Based on the asset's score from one set of score factors relative to its score from a second set of score factors, the asset's predominant character can be determined. Also, an index for a number of assets can be computed in which each constituent asset's weight is determined by the asset's score with respect to one style or another.