A behavior change method, or behavior change technique, is a theory-based method for changing one or several determinants of behavior such as a person's attitude or self-efficacy. Such behavior change methods are used in behavior change interventions. Although of course attempts to influence people's attitude and other psychological determinants were much older, especially the definition developed in the late nineties yielded useful insights, in particular four important benefits:
Traditionally, reports of evaluations of behavior change interventions barely described the actual intervention, making it very difficult to identify the most effective methods. This was increasingly recognized in the late nineties and early twenty-first century, where behavior change methods gained increasing popularity, and another taxonomy was developed and subsequently gained popularity that enabled the coding of previously published interventions.