Comments on the article by J. S. Hyde (see record 2005-11115-001), in which Hyde provided an overview of the many meta-analyses that have compared men and women on psychological attributes. The current author argues that, despite the strengths of Hyde's study, a major problem with the analysis is its lack of a theoretical basis for considering sex differences in psychological attributes. He suggests that over the last 20 years, our knowledge has been advanced by the advent of meta-analysis but also by the introduction of coherent theoretical accounts; it is unfortunate that Hyde's article did not recognize the theoretical advances as well as the methodological ones.