Implementation intentions
Naming when, where and how to act closes the gap between intending and doing.
An implementation intention is a plan in the form: when situation X occurs, I will do Y. Specifying the cue and the response in advance hands control of the behaviour to the situation, so acting no longer depends on remembering or deciding in the moment. It works on goals people already hold and does nothing for goals they do not.
From goal to if-then plan
How it shows up in software
This is the research behind scheduling steps in onboarding: pick a day, pick a time, set a reminder. It also justifies asking the user to name a concrete first task rather than describing their goals in the abstract. The output is a cue stored in the product, which the product can then fire.
Using it well
- Ask for a specific time and place during setup, and store the answer so you can prompt against it.
- Let the user write their own trigger rather than picking from your list, since the cue must be one that actually occurs in their day.
- Attach the new behaviour to an existing routine the user names, which gives the cue a reliable occurrence.
- Prompt at the named moment only, and drop the plan if it fails three times rather than falling back to generic nags.
Where it turns manipulative
- Turning a plan the user wrote for themselves into a licence for unlimited notifications converts a self-commitment into surveillance pressure.
- Eliciting a plan for a behaviour that serves you rather than them, such as a daily check-in with no user value, borrows the mechanism for retention.
- Reminding someone of a plan they have abandoned, repeatedly, produces guilt rather than action and is a common reason people delete health apps.
Where you have seen it
Duolingo
Setup asks the learner to choose a daily reminder time, which fixes the cue before the habit exists.
Apple Reminders
Location and time triggers let a user bind an intention to an actual situation rather than a list.
What the research says
- Gollwitzer, 1999Well evidenced
Set out the mechanism and reviewed experiments in which if-then planning raised goal completion over goal intention alone.
- Gollwitzer and Sheeran, 2006Mixed evidence
Meta-analysis across ninety-four independent tests found a medium-to-large effect of if-then planning on goal attainment.
Largely lab and short-horizon studies, from the era before routine preregistration. Expect a smaller effect in the field.
- Milkman, Beshears, Choi, Laibson and Madrian, 2011Mixed evidence
A mailer that asked employees to write the date and time they would get a flu shot raised vaccination rates over a plain reminder.
Later large field work, including the 2021 vaccination megastudies, found planning prompts produce real but small effects at scale. The mechanism holds; the headline sizes from lab work do not transfer.
Grades are a judgement about the evidence, not about how useful the idea is. Plenty of contested effects are still worth knowing, as long as you do not cite them as settled.