UX Design KPI

Mike's Notes

This list of KPIs comes from Vitaly Friedman's free Smashing Magazine workshop on Inclusive Design Patterns, which was held this morning on Zoom.

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Last Updated

18/05/2025

UX Design KPI

By: Vitaly Friedman
Smashing Magazine: 27/09/2024

Improve

  • Accuracy of data ≈ 100%.
  • Time to complete < 35s.
  • Time to relevance < 30s.
  • Frequency of errors < 3/v.
  • Error recovery speed < 7s.
  • Top tasks success > 80%.
  • System Usability Scale > 70.
  • WCAG AA coverage ≈ 100%.
  • Core Web Vitals ≈ 100%.

Measure

  • Sales/marketing costs < $15K/w.

Reduce

  • Flesch reading ease score > 60.
  • “Turn-around” score < 1 week.
  • Service desk inquiries < 35/w.
  • Search query iterations < 3/query.
  • Time to release/update < 14 days.
  • Non-content on a page < 25%.
  • Environmental impact < 0.3g/p.
  • Onboarding time < 15 sec.

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