Which personality development theory proposed eight stages of personality formation throughout the lifespan?

Analytical psychology, developed by Carl Jung, focuses on the exploration of the unconscious mind, archetypes, and the process of individuation. Jung's theory does not specifically outline distinct stages of personality development throughout the lifespan, making it an incorrect choice for this question.

Interpersonal psychoanalysis, pioneered by Harry Stack Sullivan, concentrates on interpersonal relationships and the role of early social interactions in shaping personality. While this theory emphasizes the significance of social interactions, it does not propose a specific framework of eight stages for personality development.

Classical psychoanalysis, established by Sigmund Freud, centers on the role of unconscious conflicts and early childhood experiences in personality development. Freud's psychoanalytic theory focuses on psychosexual stages rather than the psychosocial stages outlined in Erikson's model, making it distinct from the eight-stage theory in question.