Work Expands to Fill the Time
Give a task a deadline and a fixed box, or it will consume everything available and finish no better.
- Evidence
- untested
- Topic
- Focus
- Things to do
- 3
- Read
- 1 min
Not a tested claim. A way of thinking that is useful and widely used, but that nobody has actually put to the test — so it is not dressed up as evidence here.
- C. Northcote Parkinson, The Economist, 1955 — a satirical essay, not a study
Check it yourself: find this on Google Scholar
A correction to this entry
A satirical essay in The Economist in 1955, not a study. Its only empirical support here was Ariely & Wertenbroch (2002), which was retracted on 2 September 2026. The observation is a useful frame; it is not a finding.
Why it works
Without a boundary there is no forcing function for the judgment call “this is good enough”, so polishing continues indefinitely.
What to do about it
- Schedule tasks as appointments with an end time, not as list items.
- Halve the time you'd allow, and see what actually breaks. Usually it's only the polish.
- Set the deadline before you start; a deadline set mid-task is a negotiation.
Where people go wrong
Boxing creative work so tightly there's no room for the wandering that produces the idea. Box the execution, not the thinking.
Read next
- Satisfice on Everything but the FewPeople who seek the best option end up with objectively better outcomes and feel worse about them.solid
- Attention ResiduePart of your attention stays on the previous task — unless you left it with a written plan for resuming.shaky
- The Phone Doesn't Have to BuzzA smartphone within reach reduces available working memory even when it is face-down, silent and switched off.solid
- Give the Peak to the Hard ThingAnalytic performance peaks in the first hours after waking for most people; protect that window, and spend the trough on admin.solid