In social science, a social relation or social interaction refers to a relationship between two (i.e. a dyad), three (i.e. a triad) or more individuals (e.g. a social group). Social relations, derived from individual agency, form the basis of the social structure. To this extent social relations are always the basic object of analysis for social scientists. Fundamental enquiries into the nature of social relations are to be found in the work of the classical sociologists, for instance, in Max Weber's theory of social action. Further categories must be established in the abstract in order to form observations and conduct social research, such as Gemeinschaft and Gesellschaft (lit. "Community and Society") or "collective consciousness"