Any task will inflate until all of the available time is spent.


  1. Limit the time it takes to complete a task to what users expect it’ll take.
  2. Reducing the actual duration to complete a task from the expected duration will improve the overall user experience.


Articulated by Cyril Northcote Parkinson as part of the first sentence of a humorous essay published in The Economist in 1955 and since republished online, it was reprinted with other essays in the book Parkinson’s Law: The Pursuit of Progress (London, John Murray, 1958). He derived the dictum from his extensive experience in the British Civil Service.


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