Why the plan happens on Monday

Whatcha Doing asks you to write your plan on Monday. Not whenever you feel like it, not at the start of a project. Monday, every week, about four minutes. That choice has research behind it, and it matters most if you're building something on your own or after work, where nobody else sets the rhythm of your week.

Mondays feel like a fresh start, and that's measurable

In 2014, Hengchen Dai, Katherine Milkman and Jason Riis looked at what happens around what they called temporal landmarks: the start of a week, a month, a year, a semester, a birthday. They used three very different data sets and found the same pattern in each.

• Google searches for "diet" were about 14% higher at the start of the week than at the end of it.
• At a university gym, students were about 33% more likely to work out on a Monday.
• On a website where people sign commitment contracts for their goals, new commitments jumped by about 63% on Mondays.

The researchers call it the fresh start effect. A landmark draws a line under the old period. The failures of last week start to feel like they belonged to someone else, and the new week feels like a clean page on which you might do better.

A fresh start is a good time to plan, not a guarantee

Notice what the study measured: people starting. Searching, signing up, making commitments. A fresh start is when motivation to begin is highest, which makes it the best moment to decide what this week is for.

It doesn't promise follow-through. Anyone who has made a New Year's resolution knows how that goes. The energy that makes Monday a good day to plan has mostly gone by Wednesday.

Monday is when you're most willing to commit. Sunday is when you find out whether you meant it.

Why the week is the right size

A year has one big fresh start. A week has one every seven days, which means you never have to wait long for the next one. Miss a week and you aren't stuck with a ruined month. You get a new Monday, with Sunday's report telling you exactly what went wrong.

That's the loop: write the plan when the week feels new, log what you actually do while it runs, and compare the two before the next Monday comes round. The plan uses the fresh start. The check makes sure it wasn't only a feeling. It's the same check nobody else asks you for if you work for yourself.

Sources

• Dai, H., Milkman, K. L., & Riis, J. (2014). The fresh start effect: Temporal landmarks motivate aspirational behavior. Management Science, 60(10), 2563–2582.