“Self-Determination Theory: Basic Psychological Needs in Motivation, Development, and Wellness is [the authors’] magnum opus—a definitive exposition of autonomy, competence, and relatedness as basic psychological needs….Transcending social psychology, self-determination theory (SDT) has become a multidisciplinary phenomenon with implications for health sciences, sociology, social work, environmental studies, and philosophy of education.”

—Theory and Research in Education


“For over 30 years, Richard Ryan and Edward Deci have worked together to expand theory and research on intrinsic motivation. Their new book, Self-Determination Theory…is an impressive synthesis of their work to date.”

—PsycCRITIQUES


“This valuable volume presents a synthesis of four decades of systematic work within one of the most comprehensive, profound research programs on human motivation in the history of psychology. It is a true milestone in motivational research, as rich in conceptual insights as it is in exciting findings. The book offers a formidable set of answers as to why people do what they do, and with what consequences. An assured and instant classic!”

—Arie W. Kruglanski, PhD, Distinguished University Professor, Department of Psychology, University of Maryland, College Park


“This book is a tour-de-force exposition of the motivational nutrients needed for optimal human growth and well-being. It is global in scope, while also replete with applications to specific contexts. SDT and its mini-theories are characterized by astonishing scholarly vitality and depth of thought, combined with unrivaled relevance for everyday life at all levels of society. Taken as a whole, the advances summarized in this volume have transformed what we know about human behavior and development.”

—Carol D. Ryff, PhD, Hilldale Professor of Psychology, University of Wisconsin–Madison


“A masterful, comprehensive explication of the tenets of SDT. The authors demonstrate a keen sense of history and respect for their intellectual ancestors, stepping only lightly on a few theoretical toes. The theoretical claims that comprise SDT are coherently documented by a plethora of well-crafted and ingenious laboratory and real-world research studies. A major contribution is the compelling practical application of the theory to numerous life domains, including classroom teaching, the workplace, psychotherapy, and others. There is great wisdom in these applications. The breadth of topics will make this volume attractive to researchers, clinicians, educators, and sports and organizational psychologists.”

—Susan Harter, PhD, John Evans Professor of Psychology (Emerita), University of Denver


“Ryan and Deci are among the most brilliant psychologists of our time, and SDT has been one of the most influential theories in the field of motivation for the past 30 years. In this book, Ryan and Deci provide an in-depth review of research on SDT, which provides overwhelming support for their theory in a number of contexts, activities, and cultures. This book is a 'must read.' I recommend it for all motivational scientists and graduate students alike. Self-Determination Theory will leave its mark for years to come and will become a classic in the field.”

—Robert J. Vallerand, PhD, Canada Research Chair on Motivational Processes and Optimal Functioning and Professor of Social Psychology, Université du Québec à Montréal


“This much-anticipated volume does not disappoint! Ryan and Deci explain SDT with a richness and clarity that will enable readers at all levels to understand and use this important and increasingly influential theory. The organization is excellent—the reader is walked through the philosophical and historical foundations, presented with the key mini-theories that make up SDT, and then, equipped with the basics, introduced to the myriad applications of the theory for increasing human well-being. This book is essential reading for educational psychologists and those training for careers in education as it provides crucial information about setting up environments to maximize student motivation, learning, and adjustment. Bravo to the authors for this invaluable, beautifully written resource that will be in the hands of all of my undergraduate and graduate students.”

—Wendy S. Grolnick, PhD, Professor of Psychology and Director of Clinical Training, Clark University