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Peter principlevsParkinson's law

The short answer

Both began as satire of bureaucracy and both survived contact with evidence. Parkinson explains why the organisation grows. Peter explains why it grows worse.

Side by side

AspectPeter principleParkinson's law
ExplainsCompetence declineHeadcount growth
Published19691955
Intended asSatireSatire
Empirically testedYesPartly

Which one you meant

Readers who land here meaning Peter Principle rather than Parkinson's law are usually searching for phrases like “what is the peter principle”, “why are managers bad”, “peter principle explained”.

Peter Principle

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Parkinson's Law

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Which came first

Parkinson's law. 19 November 1955 — The satirical essay appears in The Economist, following a Royal Commission report on the civil service.

  1. 19 November 1955Parkinson's LawThe satirical essay appears in The Economist, following a Royal Commission report on the civil service.
  2. 1969Peter PrincipleLaurence J. Peter and Raymond Hull publish The Peter Principle. They intended it as satire.

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