Formally, SDT comprises five mini-theories, each of which was developed to explain a set of motivationally based phenomena that emerged from laboratory and field research. Each, therefore, addresses one facet of motivation or personality functioning.
Cognitive Evaluation Theory (CET) concerns intrinsic motivation, motivation that is based on the satisfactions of behaving “for its own sake.” Prototypes of intrinsic motivation are children’s exploration and play, but intrinsic motivation is a lifelong creative wellspring. CET specifically addresses the effects of social contexts on intrinsic motivation, or how factors such as rewards, interpersonal controls, and ego-involvements impact intrinsic motivation and interest. CET highlights the critical roles played by competence and autonomy supports in fostering intrinsic motivation, which is critical in education, arts, sport, and many other domains.
The second mini-theory, Organismic Integration Theory (OIT), addresses the topic of extrinsic motivation in its various forms, with their properties, determinants, and consequences. Broadly speaking extrinsic motivation is behavior that is instrumental—that aims toward outcomes extrinsic to the behavior itself. Yet, there are distinct forms of instrumentality, which include external regulation, introjection, identification, and integration. These subtypes of extrinsic motivation are seen as falling along a continuum of internalization. The more internalized the extrinsic motivation, the more autonomous the person will be when enacting the behaviors. OIT is further concerned with social contexts that enhance or forestall internalization—that is, with what conduces toward people either resisting, partially adopting, or deeply internalizing values, goals, or belief systems. OIT particularly highlights supports for autonomy and relatedness as critical to internalization.
Causality Orientations Theory (COT), the third mini-theory, describes individual differences in people’s tendencies to orient toward environments and regulate behavior in various ways. COT describes and assesses three types of causality orientations: the autonomy orientation in which persons act out of interest in and valuing of what is occurring; the control orientation in which the focus is on rewards, gains, and approval; and the impersonal or amotivated orientation characterized by anxiety concerning competence.
Fourth, Basic Psychological Needs Theory (BPNT) elaborates the concept of evolved psychological needs and their relations to psychological health and well-being. BPNT argues that psychological well-being and optimal functioning is predicated on autonomy, competence, and relatedness. Therefore, contexts that support versus thwart these needs should invariantly impact wellness. The theory argues that all three needs are essential and that if any is thwarted there will be distinct functional costs. Because basic needs are universal aspects of functioning, BPNT looks at cross-developmental and cross-cultural settings for validation and refinements.
The fifth mini-theory, Goal Contents Theory (GCT), grows out of the distinctions between intrinsic and extrinsic goals and their impact on motivation and wellness. Goals are seen as differentially affording basic need satisfactions and are thus differentially associated with well-being. Extrinsic goals such as financial success, appearance, and popularity/fame have been specifically contrasted with intrinsic goals such as community, close relationships, and personal growth, with the former more likely associated with lower wellness and greater ill-being.