Core metrics
- Task success rate: percent who complete the task
- Time on task: median time to finish
- Error rate: preventable mistakes per task
- SUS: quick usability score from a short survey
- Qual notes: quotes that explain the why behind numbers
Checklist
- What outcome will this change improve and how will we measure it
- Can we test one primary change at a time
More reading: NNG on task success and MeasuringU on SUS.
Heuria creates a shareable PDF you can copy from to build your rationale. Start at app.heuria.io.