In this article, we argue for a change in how researchers study motivation to learn. We believe that research can provide better explanations of the origins and outcomes of behavior, and thus be more useful, if we focus on how motivation develops and why it changes. We suggest reframing motivation research in education by extending the current focus on beliefs to studying the transactions among persons engaged in specific classroom activities over time. We present one approach from developmental psychology--Rogoff's three planes--that attempts to account for this transaction. We then present examples of current motivation research to illustrate how this approach has been applied. We believe that using this framework can produce new results that are meaningful for both researchers and practitioners who want to understand and foster motivation in education. (Contains 1 table.)