To study the applicability of simple structure logic for factorial data from scientific disciplines outside psychology, four correlation matrices from each of six scientific areas were factor analyzed by five factoring methods. Resulting factor matrices were compared on two objective criteria of simple structure before and after rotation. Factoring methods differed in their ability to provide a simple structure for a given set of data. Scientific disciplines differed in the extent to which they provided data which could be factor analyzed, but not in the simple structure of factors obtained. Varimax rotation did not systematically improve simple structure. (Author)