A frequently cited cycle of change model is the transtheoretical (stages of change) model (Prochaska and DiClemente 1984). The model includes six stages of change, which people may go through several times before maintaining behaviour change. Individuals may not go through all stages and may go back and forth between stages, not necessarily consecutively. The value of this model is that practitioners can tailor their interventions appropriately to whatever stage the patient is at. The six stages include (Prochaska and DiClemente 1984):