This document outlines learning goals and key concepts for understanding theories of cognitive development by Jean Piaget and Lev Vygotsky. It discusses Piaget's four stages of cognitive development in children as well as Vygotsky's zone of proximal development and scaffolding. It also addresses applying these theories to education and comparing Piaget and Vygotsky's views, describing cognitive changes in adulthood, and lists important terms and people related to theories of cognitive development.