This document discusses several theories related to understanding students' basic psychological needs. It covers Maslow's hierarchy of needs, Dreikurs' four goals of misbehavior, Glasser's five basic needs, and Coopersmith's needs for significance, competence and power. Erikson's stages of psychosocial development and the work of Elkind and Lipsitz on social factors are also summarized. The document concludes by listing factors that can put students at risk for school failure if their needs are not adequately met.