This document summarizes several theories of child development and psychology: 1. Howard Gardner's theory of multiple intelligences which identifies eight types of intelligence including linguistic, logical-mathematical, spatial, bodily-kinesthetic, musical, interpersonal, intrapersonal, and naturalist. 2. Erik Erikson's psychosocial stages of development which identifies eight stages from infancy to old age centered around resolving crises of trust, autonomy, initiative, industry, identity, intimacy, generativity, and integrity. 3. Bronfenbrenner's ecological systems theory which describes a child's development within different environmental systems from the microsystem to the macrosystem. 4. Piag