Contents: Preface. Part I: A Critical Analysis of Approaches to Self and Identity. Identity Theory in Perspective. Psychological Approaches to the Concepts of Self and Identity. The Identity Concept in Sociology. Integrating Sociological and Psychological Perspectives on Identity: Toward a Social Psychology of Identity. Issues in Definition and Critique. Part II: A Return to a Formal Theory of Ego Identity Formation. Erikson Revisited: The Basis of a Formal Theory of Identity Formation. Identity, Agency, and Social Structure. Part III: Theoretical and Empirical Elaborations for a Social Psychology of Identity in Late Modernity. Identity Capital. Assessing the Adequacy of Identity Stage Resolution in Late Modernity. Identity and Late Modern Society: Ongoing Concerns and Future Research.