If-Then Planning: How to Write a Trigger That Gets You Started

If-then planning means deciding in advance when and where you will act, written as "If [moment], then I [action]." Psychologists call it an implementation intention. A 2025 review of 642 tests found a positive, small-to-moderate effect: the decision is made ahead of time, so starting takes less willpower when the moment comes.

The format: "If [moment], then I [action]"

An if-then plan has two halves. The "if" is a cue you will notice: a time, a place, or a point in your day. The "then" is one concrete action you can begin right away. "If it's 9 AM and I'm at my desk, then I open the budget file" works. "If I have time, then I'll look at the budget" does not, because nothing tells you that the moment has arrived.

The idea comes from the psychologist Peter Gollwitzer, who described implementation intentions in 1999 (American Psychologist 54, 493–503). A goal says what you want. The if-then plan says when, where and how you will start on it.

What the research says

The largest summary so far is a 2025 meta-analysis by Sheeran, Listrom and Gollwitzer in the European Review of Social Psychology (36(1), 162–194). Across 642 tests, forming an if-then plan had an overall effect of d = .36, and d = .27 on behavior itself. After correcting for publication bias, the effect on behavior fell to d = .15.

Read honestly, that is a positive, small-to-moderate effect. Real enough to use, too modest to carry a task on its own.

At workplace flu-shot clinics, employees whose reminder prompted them to note the date and time they planned to go were 4.2 percentage points more likely to get the shot, from a 33.1% baseline (Milkman and colleagues, PNAS 108(26), 2011).

What makes a trigger work

The 2025 review also compared kinds of cues. Plans that named a time and a place did better than plans that named a time alone (d = .46 versus d = .25). Cues tied to a point in the task itself also did well: finishing one phase of the work (d = .64) and starting a phase (d = .49), though those two results come from small samples.

• Name a moment you will actually notice, not "later" or "when I can".
• Add the place: the desk, the kitchen table, the meeting room.
• Make the action small enough to start within a minute.
• Write one trigger per task. Ten triggers in a row is a to-do list again.

Ten if-then triggers for a workday (examples)

These are illustrations to adapt, not rules:

1. If it's 9 AM and I'm at my desk, then I write the first line of the quarterly summary before email.
2. If the team call ends, then I write my action items before I leave the room.
3. If I sit down after lunch, then I spend the first half hour on the proposal.
4. If a meeting finishes early, then I answer the oldest message in my inbox.
5. If I finish one section of a document, then I write the heading of the next one before I stop.
6. If it's 4:30 PM, then I choose tomorrow's three priorities.
7. If I catch myself switching tabs, then I go back to the task and write its next step.
8. If a new request arrives during a focus block, then I note it on the backlog and keep working.
9. If it's Friday at 3 PM, then I review the week and move unfinished items forward.
10. If I bring my coffee back to the desk in the morning, then I start the first timebox.

The trigger in the Action Day® Method

The Action Day® Method has four steps: TO-DO → TIMEBOX → DO → DONE™. You choose three priorities with the Rule of 3, give each one a Start & End Time, then use an If-Then trigger at the DO step, so the start is decided before the moment arrives: "If it's 9 AM, then I start." The research above suggests one small improvement, adding the place: "If it's 9 AM and I'm at my desk, then I start."

See all four steps on how the Action Day® Method works, and read what time blocking is for the TIMEBOX step that sets the time your trigger points to.

What if-then planning cannot do

A trigger helps you start something you already intend to do. In the 2025 review, the effect was larger among people strongly committed to the goal (d = .79). A trigger will not make you care about a goal you don't, and it does not replace choosing the right work first. If the task is the wrong one, start with a priority rule such as the Rule of 3, then add the trigger.

Write yours

1. Pick one task you have been putting off.
2. Choose a moment you will notice tomorrow: a time, plus the place you will be.
3. Name the first physical action, one you could begin within a minute.
4. Put it in one line: "If [time] at [place], then I [action]."
5. Write it next to the timebox for that task, so the cue and the slot sit together.

The Timeboxing® Weekly Planner has weekly layout pages and a daily planner with an hourly schedule next to your to-do lists, so the task, its Start & End Time and its trigger share one page.