Self-Determination Theory (SDT) is a macro theory of human motivation and personality that concerns peoples innate growth tendencies and innate psychological needs. It pertains to the motivation behind peoples choices in the absence of external influences and distractions. SDT focuses on the degree to which human behavior is self-motivated and self-determined.

SDT comprises six mini-theories, each of which was developed to explain a set of motivationally based phenomena that emerged from laboratory and field research. These mini-theories include cognitive evaluation theory, organismic integration theory, causality orientations theory, basic needs theory, goal contents theory, and relational motivation theory.

One mini-theory of SDT includes basic psychological needs theory, which proposes three basic psychological needs that must be satisfied to foster well-being and health. These three psychological needs of autonomy, competence, and relatedness are generally universal and apply across individuals and situations.

SDT has been applied in many life domains such as health, sport, education, and work. It has been found that work environments that support the three core needs of autonomy, relatedness, and competence lead to positive work-related outcomes. SDT can help employers understand how best to develop and engage their people, and can help individuals understand how they can be successful professionally.

In summary, SDT is a theory of human motivation and personality that focuses on the degree to which human behavior is self-motivated and self-determined. It comprises six mini-theories, including basic psychological needs theory, and has been applied in many life domains such as health, sport, education, and work.