Self-Determination Theory
Self-Determination Theory (SDT) is a macro-theory of human motivation developed by Edward Deci and Richard Ryan. It proposes that human beings have three innate psychological needs — autonomy, competence, and relatedness — and that satisfying these needs is essential for wellbeing, engagement, and sustained motivation.
What it is
Deci and Ryan developed SDT over several decades, beginning with research in the 1970s on the distinction between intrinsic motivation (engaging in an activity for its own sake) and extrinsic motivation (engaging because of external rewards or pressures). Their key finding was that external rewards, when introduced for activities people already find intrinsically motivating, can paradoxically undermine motivation — the so-called 'overjustification effect'.
The three basic psychological needs are: Autonomy (the experience of volition and self-endorsement of one's actions), Competence (the feeling of effectiveness and mastery), and Relatedness (the sense of meaningful connection with others). SDT predicts that contexts which support these needs will foster intrinsic motivation, wellbeing, and performance; contexts that thwart them will generate amotivation, anxiety, or compliance without engagement.
How it is used in coaching
SDT is a powerful theoretical lens for coaches. It explains why some clients are highly motivated and others feel chronically stuck — not because of personality flaws but because their environment or role fails to meet their basic psychological needs. Coaches use SDT to diagnose motivation, help clients design work and life structures that support autonomy and competence, and understand the limits of external incentives.
Key benefits & applications
Robust empirical base; explains why motivation varies across contexts; applicable to leadership, education, health behaviour, and career coaching; supports intrinsic motivation over dependence on rewards.
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