The Self-Care Nursing Theory or the Orem Model of Nursing was developed by Dorothea Orem is considered a grand nursing theory, which means the theory covers a broad scope with general concepts that can be applied to all instances of nursing.
Stages of behavior change. Transtheoretical Model of Change, a theoretical model of behavior change was originally explained by Prochaska & DiClemente, 1983. The TTM is a model of intentional change. This model focuses on the decision making of the individual. source: http://currentnursing.com/nursing_theory/transtheoretical_model.html