Phenomena such as group integration and group cohesiveness can be best studied through the examination their functional components, or bases. Three bases group integration are operationally defined: functional integration, interpersonal integration, and normative integration. Results from a study 61 children's groups indicate that functional integration and interpersonal integration manifest the highest positive correlation whereas normative integration and interpersonal integration manifest the next highest. The correlation between functional integration and normative integration does not attain an acceptable level statistical significance. The three bases group integration are differentially distributed in groups varying size, sex composition, and social milieu. Small groups, as well as larger social systems, must attain and maintain adequate, although as yet ill-defined, degrees integration and cohesiveness in order to constitute a persistent order or to undergo an orderly process social change. However, group integration and group cohesiveness, despite their central positions in the literature sociology and social psychology, have yet to be defined in a consistent and differentiated fashion. The two phenomena are usually conceptualized in an highly abstract manner and, oftentimes, are used interchangeably or defined in terms one another. Integration, for example, has been defined as the uniting of separate entities into a cohesive whole which is something different from its parts (Fairchild, 1944:159). In order to facilitate clarification the interacting, and sometimes countervailing, nature the social forces contributing to the cohesiveness and integration small groups efforts should be made to differentiate and examine the functional components, or bases, such phenomena.