The document discusses the theories of developmental psychologist James Marcia. [1] Marcia expanded on Erik Erikson's psychosocial stages of development by arguing that identity formation in adolescence involves crisis and commitment, rather than just resolution or confusion. [2] Marcia identified four identity statuses - identity diffusion, foreclosure, moratorium, and achievement - that describe the process of establishing an identity. [3] The document also discusses criticisms of Marcia's identity theories and applications to teaching in the classroom.