Delhi for Perceived susceptibility and self-efficacy have been identified as important and consistent predictors of change. As such, they carry intervention potential, but tailored interventions for different stages are more costly than a one size fits all’ approach, and evidence is mixed as to their success. Further reading Conner, M. and Norman, P. eds Predicting Health Behaviours. Buckingham Open University Press. An excellent text that provides comprehensive coverage of social cognition theory and all the models described in this chapter with the exception of the HAPA. Delhi 2016.