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
According to Elisabeth Kübler-Ross, in her book called “On Death and Dying”, there are five stages of grief. However, one should not conclude that these stages only apply in case of personal death or somebody else’s death. We can experience the stages in other traumatic life events such as social rejection, divorce, break-up, disease, etc. Although she is popular for her grief model, she also did a lot of research on other aspects associated with death, dying and overall personal trauma.