This document discusses Lev Vygotsky's social development theory, which has three major themes: social interaction, the more knowledgeable other, and the zone of proximal development. It explains that social learning precedes individual development, learning leads to development, and social interaction is the basis for cognitive growth. The document also provides examples of how teachers can use this theory with and without technology, and how students can apply the theory with and without technology through social interaction, communication, and using their skills.