This volume brings together four semi-autonomous bodies of research (choice, self-determination, self-regulation, and self-management) to form a new theory of self-engaged learning entitled, Self-Determined Learning Theory. This theory explains why and how students self-engage. It identifies the factors that give students the sense of control over their learning that is needed for sustained, adaptive, and ultimately successful learning. It begins by describing the characteristics of disengaged learners, then describes and illustrates self-determined learning theory within both normal and special populations. It then examines the theory's predictive value across several special population contexts and then concludes with a critique of the theory's credibility and worth.