The growing differentiation within the International Sociological Association (ISA) requires different forms of integration among Research Committees (RCs). The aim of this paper is to reveal some patterns of integrational versus differentiational activities and produce an organizational and conceptual typology of RCs. The problem is approached by different clustering methods: Ward's hierarchical clustering, local optimization methods and hierarchical clustering with relational constraints for different types of Connectivity between units in clusters. International Sociological Association, Sociological Specialization, Classification Analysis, Typological Analysis, Classification with Constraints.