This document discusses developmental stages and tasks across the lifespan. It presents outlines for conceptualizing development according to Havighurst and Santrock, two theorists. Havighurst identified 6 main stages - infancy & early childhood, middle childhood, adolescence, early adulthood, middle adulthood, and later maturity. Each stage involves developmental tasks that must be achieved. Similarly, Santrock identified 7 stages - prenatal period, infancy, early childhood, middle and late childhood, adolescence, early adulthood, middle adulthood, and late adulthood. The document provides an overview of the stages and developmental tasks according to these two perspectives on human growth and change across the lifespan.