B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
85%
85% -- usability problems detected for usability testing participants (2026)
Testing with five users typically uncovers around 85% of usability problems in an interface.
- Benchmark rule of thumb established by Nielsen Norman Group
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
85%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
5
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Nielsen Norman Group
Primary
Tier C
https://www.articos.com/blog/how-to-conduct-user-research-nonprofit ↗
Source Article
How to Conduct User Research for Nonprofit: The Right Way
Original Research
Nielsen Norman Group
· Original study ↗
Methodology
Benchmark established by Nielsen Norman Group research on sample sizes
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
usability testing participants: 85% usability problems detected. Source: Nielsen Norman Group (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/five-users-85-percent-usability-problems
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<blockquote cite="https://lighthousedata.io/data/five-users-85-percent-usability-problems" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>85%</strong> -- usability problems detected for usability testing participants<br><small>Source: Nielsen Norman Group (2026) · <a href="https://lighthousedata.io/data/five-users-85-percent-usability-problems" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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