The purpose of this non-empirical paper is to explore the theoretical value of introducing constructs of self-determination theory (SDT) into the framework of the theory of planned behavior (TPB). Deci’s and Ryan’s (1985) formulation of SDT maintains an intrinsic focus while much of Ajzen’s (1985) TPB framework maintains an extrinsic focus. The incorporation of constructs based on an internal locus of causality may enhance the predictive power of TPB. Applications for practitioners and opportunities for further research are presented.


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