Work expands to fill the time available for its completion. Cyril Northcote Parkinson introduced this observation in a 1955 Economist essay as a satirical commentary on bureaucracy, but the principle has proven empirically robust across a wide range of contexts. In product design and development, Parkinson's Law manifests as scope creep, design by accretion, and timeline inflation. Projects given generous schedules fill those schedules with additional work of decreasing marginal value. Interfaces given ample screen space fill that space with content of decreasing relevance.
Parkinson's Law
Why constraints produce better design than open-ended scope
A
Designers Academy
5 November 2025 · 4 min read
UXPrinciples
In brief
Parkinson's Law in product design explains how open-ended scope leads to over-engineering, while deliberate constraints force prioritization, resulting in sharper, higher-quality design outcomes.
