ABSTRACT The term autonomy literally refers to regulation by the self. Its opposite, heteronomy, refers to controlled regulation, or regula-tion that occurs without self-endorsement. At a time when philosophers and economists are increasingly detailing the nature of autonomy and recognizing its social and practical significance, many psychologists are questioning the reality and import of autonomy and closely related phe-nomena such as will, choice, and freedom. Using the framework of self-determination theory (Ryan & Deci, 2000), we review research concerning the benefits of autonomous versus controlled regulation for goal perfor-mance, persistence, affective experience, quality of relationships, and well-being across domains and cultu...