Health Psychology35.9 (Sep 2016): 935-943. Objective: In this study, the aim was to (a) test for the first time whether implementation intentions formed outside the laboratory can overcome the effects of habits, and (b) see whether the operation of implementation intentions could be improved by asking people to form certain “when–then” plans as opposed to uncertain “if–then” plans. To read the full article, log in using your NHS OpenAthens details.