The document discusses the stages of human development and corresponding developmental tasks. It describes 8 stages from prenatal to late adulthood. Each stage is associated with expected tasks such as learning to walk in infancy or selecting a mate in early adulthood. Developmental tasks are challenges that must be achieved for healthy development and success in later life. The document also notes ongoing debates in developmental psychology around the influences of nature vs nurture and continuity vs change across the lifespan.