Self-determination theory (SDT) provides a framework for understanding the factors that promote motivation & healthy psychological & behavioral functioning In this authoritative work the codevelopers of the theory comprehensively examine SDT's conceptual underpinnings (including its six mini-theories) empirical evidence base & practical applications across the lifespan The volume synthesizes a vast body of research on how supporting--or thwarting--people's basic needs for competence relatedness & autonomy affects their development & well-being Chapters cover implications for practice & policy in education health care psychotherapy sport & the workplace