History and Core Constructs of The Model
James O. Prochaska of the University of Rhode Island and colleagues developed the Transtheoretical Model beginning in 1977. It is based on analysis and use of different theories of psychotherapy, hence the name "transtheoretical."
Prochaska and colleagues refined the model on the basis of research that they published in peer-reviewed journals and books. The model consists of four "core constructs": "stages of change," "processes of change," "decisional balance," and "self-efficacy."
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