B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
85%
85% -- usability issues uncovered for usability testing participants (2025)
Five participants in usability testing will uncover approximately 85% of usability issues.
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Lighthouse Research Team
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Source verified
Evidence graded
Value
85%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Nielsen Norman Group
Primary
Tier B
https://www.christianstrunk.com/blog/qualitative-user-research ↗
Source Article
Qualitative User Research: Methods That Reveal What Users Really Need
Qualitative User Research: Methods That Reveal What Users Really Need
TL;DR: Qualitative User Research
Qualitative user research studies why users behave the way they do, through interviews, observation and usability tests, instead of counting how many.
- When: Choose it when you need motivations, u…
Original Research
Nielsen Norman Group
· Original study ↗
Methodology
Cited Nielsen Norman Group research on small-sample usability testing
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
usability testing participants: 85% usability issues uncovered. Source: Nielsen Norman Group (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/usability-testing-five-participants-85-percent-issues
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<blockquote cite="https://lighthousedata.io/data/usability-testing-five-participants-85-percent-issues" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>85%</strong> -- usability issues uncovered for usability testing participants<br><small>Source: Nielsen Norman Group (2025) · <a href="https://lighthousedata.io/data/usability-testing-five-participants-85-percent-issues" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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