Rule · how
Write down when and where
A written action plan with time and place.

Studies (10)
Paper
With habit tools, people did a daily self-kindness exercise more often for six monthsTestedHelpedPeople who got a plan, phone reminders and skip days did the exercise more, and it felt more automatic.
Randomised trial of 497 US adults with smartphones · vs the same exercise and cue without habit tools · they rated themselves
Paper
Men who planned gym times and trained with coaches were more activeTestedHelpedMen who planned set exercise times, laid out gym clothes and trained with coaches moved more than men without it.
Trial, groups not picked at random of 139 inactive men at a Saudi university · vs men who got no programme · behaviour was recorded · ⚠ numbers unreliable
Paper
After using a walking app with two coaching calls, brisk walking felt more automaticUsedNo comparisonAfter planning 10-minute brisk walks with an app and two coach calls, brisk walking felt more automatic. There was no other group to compare with.
Small study of one group of 44 inactive adults after cancer treatment · no comparison group · they rated themselves · ⚠ groups weren't properly compared; results not tested statistically
Paper
Three short planning talks made healthy eating feel more automatic for older peopleTestedHelpedPlanning one new eating habit at a time made healthy food feel more automatic than a leaflet did.
Small randomised trial of 54 older dental patients in Northern Ireland · vs people who only got a healthy-eating leaflet · they rated themselves · ⚠ numbers unreliable; many people dropped out
Review
Habit plans made exercise feel a bit more automaticTestedHelpedIn 10 studies, help to plan, track and get reminders made exercise feel more automatic than for the rest.
Pooled analysis of 10 studies with 2,349 people · vs a mix of other groups · they rated themselves · ⚠ whole programmes were tested, so no single part can be credited
Paper
A habit app for weight loss didn't clearly beat waitingTestedNo differencePlans, logs and daily reminders in an app did not clearly help people eat well more than waiting.
Small randomised trial of 81 overweight adults in the UK · vs people who waited for the app · they rated themselves · ⚠ many people dropped out; numbers unreliable; only counted people who finished; groups weren't properly compared
Paper
A short habit leaflet made food and exercise habits feel more like second natureTestedHelpedWith a tip sheet, plans and daily ticks, food and exercise habits felt more automatic than in usual care.
Randomised trial of 537 adults with obesity in England · vs usual weight-loss care · they rated themselves
Paper
Web plans built exercise and diet habits briefly, but not by three monthsTestedMixedPlans for when, where and how to move built a stronger habit at 8 weeks, but not at 3 months.
Randomised trial of 790 adults in Germany and the Netherlands · vs people who were waiting for the programme · they rated themselves · ⚠ many people dropped out; numbers unreliable; summary claims more than the results show
TestedMixedThe same web plans built a stronger fruit and vegetable habit at 8 weeks, but not at 3 months.
Randomised trial of 790 adults in Germany and the Netherlands · vs people who were waiting for the programme · they rated themselves · ⚠ many people dropped out; numbers unreliable; summary claims more than the results show
Paper
Picturing your future self worked no better than a short meditationUsedNo differenceStudents who pictured their future self twice a week put things off no less than those who meditated.
Randomised trial of 193 university students in Canada · vs students who listened to a calming meditation · they rated themselves · ⚠ student thesis, not checked by other scientists; numbers unreliable
Paper
Parents' food goals felt more automatic after home visits, with no group to compareUsedNo comparisonParents who set one clear food goal at a time said it felt much more automatic within six weeks.
Small study of one group of 57 parents of young children in London · no comparison group · they rated themselves · ⚠ intervention arm only, no comparison analysed; post-hoc analysis; numbers unreliable
Often used with it






Action4
Make an if-then plan for your obstacleImplementation intentions or WOOP/MCII: if this obstacle happens, then I will do that.