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Philosology Essay Preview: Philosology Report this essay In the text form, Human Development Ninth Edition by Diane E. Papalia, Sally Weldkos Olds, Ruth Duskin Feldman (POF), Psychoanalyst Erik Erikson had a theory of psychosocial development that covered eight stages of life. These stages were in the form of the virtues hope, will, purpose, skill, fidelity,.