The document summarizes cognitive, physical, and social development during middle childhood from ages 7-11. Key points include: - Children develop concrete operational thought and can understand reversibility and conservation. - Their memory, vocabulary, and information processing skills improve. Socioeconomic status impacts development. - Physically, children gain weight and strength and lose baby teeth while gaining permanent teeth. Fine motor skills progress. - Socially, children identify more with peers than parents and understand other perspectives.