Self-determination theory
Motivation thrives when three basic needs — autonomy, competence, and relatedness — are met.
What it means
Self-determination theory (SDT) is a broad framework of human motivation holding that people flourish and motivate themselves when three basic psychological needs are satisfied: autonomy (acting with volition and ownership), competence (feeling effective and capable), and relatedness (feeling connected to and cared for by others). Its central claim is that motivation is not simply a quantity but a quality on a continuum from controlled to autonomous, and that contexts which support the three needs foster the more autonomous, internalized forms of motivation that sustain engagement and well-being. The mechanism is one of nutriment and thwarting: need-supportive environments — offering meaningful choice, clear and attainable challenge, and warmth — energize and internalize behavior, while controlling, pressuring, or isolating environments undermine it. SDT also explains why tangible rewards can backfire (the overjustification effect), since incentives experienced as controlling erode the sense of autonomy. The theory is one of the most empirically supported accounts of motivation across work, education, health, and sport. It matters because it tells designers, managers, and educators that durable motivation comes from supporting needs rather than from carrots and sticks.
Examples
Employees given meaningful choice, the chance to build mastery, and a sense of belonging stay engaged without external pressure.
A gym app that lets you pick your own goal, sets challenges you can just about meet, and shows a group cheering you on keeps people coming; a nagging streak counter does not.
Pupils allowed to choose which book to review, stretched but not swamped, and known by name to their teacher read for pleasure; the same pupils drilled for a test stop at the bell.
First described in Deci & Ryan (1985, 2000).