The first week of a habit

Almost everyone can do something new for three days. The interesting question is what happens in the following week, when the novelty disappears and nothing has visibly improved yet.

Researchers who follow people starting new routines find a familiar shape. Enthusiasm is highest at the start, drops sharply after the first few days, and reaches its lowest point somewhere between day seven and day fourteen. People who pass that point usually continue; people who stop, stop there.

Three things help during that low period, and none of them is willpower. The first is a smaller task. A plan that was reasonable on day one often becomes impossible on day nine, when school and family return to normal. Cutting the plan in half is better than missing it.

The second is a fixed cue: the same place and the same moment, so that starting needs no decision. The third is a record you can see. A row of marks on a calendar is weak evidence of progress but strong evidence of identity: it says that you are a person who does this.

The practical advice for a student is unglamorous. Expect week two to be the worst week. Decide now what the minimum version is — thirty seconds, five words, one page — and promise only that. Nobody keeps a promise they renegotiate every evening.