 In this way, Boas introduced culture as the primary concept for describing differences in behavior between human groups, and as the central analytical concept of anthropology.Among Boas's main contributions to anthropological thought was his rejection of the then-popular evolutionary approaches to the study of culture, which saw all societies progressing through a set of hierarchic technological and cultural stages, with Western European culture at the summit.Boas argued that culture developed historically through the interactions of groups of people and the diffusion of ideas and that consequently there was no process towards continuously "higher" cultural forms.