As we have already observed, the sciences of the social are concerned less with what is universal among societies and their inhabitants and concerned more with variations among individuals, patterns in variation, the consequences and functions of variation, the acquisition and reproduction of variation, and ultimately how patterns in all of these things change over time. We will begin Part III of the book with micro-sociological questions regarding how identities are forged. In previous chapters we talked about the function of the self-concept in agency and the acquisition of attributes to augment the self-concept. There were roles for courage and freedom in such activity. Here we discuss the accumulation of self-attributions into a single identity. This is sociology with existential credentials.