B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
85%
85% -- usability problems detected for user testing (Nielsen methodology) (2026)
Testing with five users reveals about 85% of usability problems according to Jakob Nielsen's research.
- Approximate figure ('about 85%')
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Lighthouse Research Team
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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://studio5creative.com/startup-web-design-mistakes-to-avoid-in-2026/ ↗
Source Article
Your Startup Website Is Either a Growth Engine—or a Silent Revenue Leak
Startup websites rarely fail because the product is weak — they fail because the website creates friction at the exact moment users are deciding whether to trust you. In 2026, a cluttered homepage, hidden navigation, slow load t…
Original Research
Nielsen Norman Group
· Original study ↗
Methodology
Citing Jakob Nielsen's usability research
Methodology documented
Segmentation
IndustryB2B
Company SizeSMB
RoleAll marketers
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Plain Text
user testing (Nielsen methodology): 85% usability problems detected. Source: Nielsen Norman Group (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/usability-problems-five-users-85
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<blockquote cite="https://lighthousedata.io/data/usability-problems-five-users-85" 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 user testing (Nielsen methodology)<br><small>Source: Nielsen Norman Group (2026) · <a href="https://lighthousedata.io/data/usability-problems-five-users-85" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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