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

Studies (7)
Paper
Five written plans built wake-up habits no better than a short videoTestedNo differenceWriting an if-then plan or another plan for getting up built the habit no better than a short video.
Randomised trial of 286 US adults who snooze and sleep badly · vs people who only watched the short video · they rated themselves · ⚠ many people dropped out
Paper
One set of plans was followed by a stronger habit of buying vegetablesTestedMixedPlans to buy vegetables built no stronger habit at first, but the authors report a stronger one by six months.
Randomised trial of 198 UK adults who ate few vegetables · vs the same goal and video without plans · they rated themselves
Paper
A bedtime if-then plan made each night beat one made onceUsedHelpedMaking a fresh if-then bedtime plan each night got people to bed closer to their planned time than planning once.
Randomised trial of 297 UK adults who wanted to sleep better · vs the same plan made once at the week's start · they rated themselves
Paper
Weekly point goals and a leaderboard got drivers to hold their phones lessTestedNo differenceA phone mount, or a promise with if-then plans and texted tips, cut phone use no more than risk lessons.
Large randomised trial of 1,653 US drivers who often held phones while driving · vs drivers who only got lessons on the risks · behaviour was recorded · ⚠ numbers unreliable
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
Paper
Swapping sugary drinks for diet drinks worked no better than swapping them for waterUsedNo differenceSwapping sugary drinks for diet drinks cut sugary drinks no more than swapping them for water.
Randomised trial of 136 adults who drink a lot of sugary drinks · vs people who swapped to water instead · they rated themselves · ⚠ only counted people who finished; numbers unreliable; uneven outlier exclusions between groups
UsedNo differenceSugary drinks felt no less automatic after a swap to diet drinks than after a swap to water.
Randomised trial of 136 adults who drink a lot of sugary drinks · vs people who swapped to water instead · they rated themselves · ⚠ only counted people who finished; numbers unreliable; uneven outlier exclusions between groups
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





