Parkinson's law comes from a 1955 essay by the historian C. Northcote Parkinson in The Economist, originally about bureaucracies growing regardless of the work they had to do. Today it is mostly used about individual tasks: give a report a week and it takes a week; give it an afternoon and it often takes an afternoon.
Why it matters
Open-ended time invites polishing, procrastination and scope creep. Tighter, deliberate limits often produce the same result in a fraction of the time.
How to apply it
- Timebox tasks: decide how long something deserves before you start.
- Set your own deadline earlier than the real one.
- Define what "done" looks like up front, so you know when to stop.