The self-determination theory (SDT) was developed by psychologists Edward Deci and Richard Ryan.

The data fit all three models; but only the model based on self-determination theory helped students to engage and learn.

According to self-determination theory, individuals who attribute their actions to external circumstances rather than internal mechanisms are far more likely to succumb to peer pressure.

Based on the connection between self-determination theory and environmental behaviors, Pelletier et al. suggest that successful intervention should emphasize self-determined motivation for performing environmental behaviors.

With Richard Ryan, he is the co-founder of self-determination theory (SDT), an influential contemporary motivational theory.

The self-determination theory is based on the work of Edward Deci and Richard Ryan.

The self-determination theory proposes a motivational continuum from the extrinsic to intrinsic motivation and autonomous self-regulation.

Many studies around the participants of the Special Olympics point to the self-determination theory.

This emphasizes the potential prominence of self-determination theory (SDT), which focuses upon the authentication of behaviours, values, and self-presentations as an integral feature to personal well-being.

Along with professor Edward L. Deci, he is the co-creator of self-determination theory, one of the most influential theories of human motivation.