The "stages of change" model is the work of Prochaska and DiClemente. They initially developed this model while working with people who were trying to quit smoking. This model can be applied to any type of human change, quitting smoking, starting an exercise program, changing your diet, quitting drinking or using drugs, changing your study habits, parenting techniques, trying to stop using curse words, etc. This model can be related to virtually any type of change of behavior.