Self-determination theory (SDT) is a psychological framework developed by Edward Deci and Richard Ryan that explains human motivation through three core psychological needs: autonomy, competence, and relatedness. First formally outlined in the 1980s, SDT proposes that people are most engaged, productive, and psychologically healthy when these needs are genuinely satisfied. Unlike earlier models that treated motivation as a simple dial...

Goal setting theory, developed by Edwin Locke and expanded with Gary Latham, proposes that specific, challenging goals — paired with adequate feedback — consistently produce better performance than vague or easy targets. First articulated by Locke in the 1960s and formalized in their landmark 1990 framework, the theory has become one of the most empirically supported models in motivational psychology....