This document discusses different theories that can help guide children, including those focusing on the systems children develop in, how children construct knowledge, and psychological needs. It outlines ecological theory which examines a child's environment from micro to macro levels. Family systems theory looks at boundaries, rules and roles. Piaget's stages of cognitive development and Vygotsky's zone of proximal development are also summarized. Erikson's psychosocial stages and Maslow's hierarchy of needs are presented as ways teachers can help meet children's psychological and social requirements.