This document discusses developmental stages and tasks from childhood through adulthood. It describes key stages as infancy, early childhood, middle childhood, adolescence, early adulthood, middle adulthood and late adulthood. For each stage, there are expected developmental tasks such as learning to walk, talk, read and develop social skills in childhood and selecting a career and starting a family in adulthood. The document emphasizes that mastery of tasks at each stage helps with tasks in later stages, while failure can hinder future development.