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Conduct usability tests and identify UX issues through systematic observation. Use when testing user flows, validating designs, identifying friction points, or ensuring users can complete core tasks. Covers test planning, think-aloud protocol, task scenarios, and severity rating.
npx skill4agent add daffy0208/ai-dev-standards usability-testerGood Objectives:
- "Can users complete onboarding in <5 minutes?"
- "Can users find and use the export feature?"
- "Do users understand the pricing page?"
Bad Objectives:
- "Test the UI" (too vague)
- "See if users like it" (subjective, not behavioral)Examples:
- Where do users get stuck during sign-up?
- Can users find the settings page?
- Do users understand what each tier includes?
- What errors do users encounter?Example Tasks (Project Management Tool): 1. Sign up and create account
2. Create your first project
3. Invite a team member
4. Assign a task to someone
5. Export project dataSample Size:
- 5-8 users per persona
- After 5 users, diminishing returns (Nielsen's research)
- Test in waves: 5 users → fix issues → test 5 more
Recruitment Criteria:
- Match target persona
- Haven't used product before (for onboarding tests)
- Or: Active users (for feature tests)
Incentives:
- $50-100 per hour (B2C)
- $100-200 per hour (B2B professionals)
- Gift cards work well"Your team is launching a new project next week. Create a project
called 'Q2 Launch' and invite john@example.com to collaborate.""Click the 'New Project' button, then enter 'Q2 Launch', then
click Settings, then click Invite, then enter email."Scenario: [Context/Motivation]
Goal: [What they need to accomplish]
Success Criteria: [How to know they completed it]
Example:
Scenario: You're preparing for a client meeting tomorrow and need to review past conversations.
Goal: Find all conversations with "Acme Corp" from the last 30 days
Success Criteria: User successfully uses search/filter to find conversations"Please think aloud as you work. Tell me what you're looking for,
what you're thinking, what you're trying to do. There are no
wrong answers - we're testing the product, not you."Completion Questions:
- 'On a scale of 1-5, how easy was that task?'
- 'What were you expecting to see?'
- 'What was confusing about that?'
- 'If you could change one thing, what would it be?'
Discovery Questions:
- 'Where did you expect to find that?'
- 'What do you think this [feature] does?'
- 'Why did you click there?'Measurement:
- Completed: User achieved goal without help
- Partial: User achieved goal with hints
- Failed: User could not complete task
Calculation: Task Success Rate = (Completed Tasks / Total Attempts) × 100
Target: ≥80% for core tasksMeasurement:
- Start timer when task begins
- Stop when user completes or gives up
Analysis:
- Compare to baseline/previous tests
- Identify outliers (very fast or very slow)
Target: Varies by task complexity
- Simple task (e.g., log in): <30 seconds
- Medium task (e.g., create project): 1-2 minutes
- Complex task (e.g., configure integration): 3-5 minutesErrors:
- Wrong path taken
- Incorrect button clicked
- Had to backtrack
- Gave up and tried different approach
Calculation: Errors per Task = Total Errors / Number of Users
Target: <2 errors per taskPost-Task Question:
"How satisfied are you with completing this task?" (1-5 scale)
1 = Very Dissatisfied
2 = Dissatisfied
3 = Neutral
4 = Satisfied
5 = Very Satisfied
Target: ≥4.0 averageSeverity = Impact × Frequency1 - Low Impact:
- Minor inconvenience
- User can easily recover
- Cosmetic issue
2 - Medium Impact:
- Causes delay or confusion
- User eventually figures it out
- Moderate frustration
3 - High Impact:
- Blocks task completion
- User cannot proceed without help
- Critical to core functionality1 - Rare:
- Only 1-2 users encountered
- Edge case
- Specific conditions
2 - Occasional:
- 3-5 users encountered
- Somewhat common
- Specific user types
3 - Frequent:
- Most/all users encountered
- Consistent issue
- All user typesCritical (8-9):
- Impact: 3, Frequency: 3
- Blocks most users
→ Fix immediately before release
High (6-7):
- Impact: 3, Frequency: 2 OR Impact: 2, Frequency: 3
- Significant delay or frequent minor issue
→ Fix before release
Medium (4-5):
- Impact: 2, Frequency: 2 OR Impact: 3, Frequency: 1
- Minor frustration or rare blocker
→ Fix in next release
Low (1-3):
- Impact: 1, Frequency: 1-3
- Cosmetic or rare minor issue
→ BacklogQuestions (Odd = Positive, Even = Negative): 1. I think I would like to use this product frequently
2. I found the product unnecessarily complex
3. I thought the product was easy to use
4. I think I would need support to use this product
5. I found the various functions well integrated
6. I thought there was too much inconsistency
7. I imagine most people would learn this quickly
8. I found the product cumbersome to use
9. I felt very confident using the product
10. I needed to learn a lot before getting going
Scoring:
- Odd questions: Score - 1
- Even questions: 5 - Score
- Sum all scores
- Multiply by 2.5
- Result: 0-100 score
Interpretation:
≥80: Excellent
68-79: Good (industry average)
51-67: OK
<51: Needs significant improvementusability_test_summary:
date: '2024-01-20'
participants: 8
participant_profile: 'New users, age 25-45, tech-savvy'
tasks:
- task: 'Create a new project'
success_rate: '87.5% (7/8)'
avg_time: '1m 24s'
errors: 1.2 per user
satisfaction: 4.3/5
- task: 'Invite team member'
success_rate: '62.5% (5/8)'
avg_time: '2m 45s'
errors: 2.8 per user
satisfaction: 3.1/5
issues:
- issue: "Users can't find 'Invite' button"
severity: high
impact: 3
frequency: 3
affected_users: 7/8
recommendation: "Move 'Invite' button to top of project page, make it more prominent"
- issue: 'Confusion about project vs workspace'
severity: medium
impact: 2
frequency: 3
affected_users: 6/8
recommendation: 'Add tooltip explaining difference, update onboarding'
- issue: 'Export button text unclear'
severity: low
impact: 1
frequency: 2
affected_users: 2/8
recommendation: "Change 'Export' to 'Export to CSV'"
sus_score: 72 (Good)
key_insights:
- 'Onboarding is smooth (87.5% success)'
- 'Team collaboration features hard to discover'
- 'Overall product easy to use once features are found'
recommended_actions:
1. "High priority: Redesign invite flow"
2. "Medium priority: Add contextual help for workspace vs project"
3. "Low priority: Update button labels"Pros:
- Can test with users anywhere
- Lower cost (no travel)
- Easier to recruit
- Record sessions easily
Cons:
- Can't see body language as well
- Technical issues possible
- Harder to build rapport
- Screen sharing can lag
Best Practices:
- Test your setup beforehand
- Have backup communication method
- Ask user to share screen + turn on camera
- Record session (with permission)Pros:
- See full body language
- Better rapport
- No technical issues
- Can see facial expressions
Cons:
- Limited geographic reach
- Higher cost
- Harder to schedule
- Need physical space
Best Practices:
- Set up quiet room
- Have snacks/water
- Use screen recording software
- Position yourself behind/beside userWhen to Test:
- Pre-launch: Test prototypes/designs
- Post-launch: Test new features
- Ongoing: Test every major release
- Quarterly: Full usability audit
Continuous Testing:
- Week 1: Test with 5 users
- Week 2: Fix issues
- Week 3: Test with 5 new users
- Repeat until success rate ≥80%Remote Testing:
- UserTesting.com (recruit + test)
- UserZoom (enterprise solution)
- Lookback (live testing)
- Maze (unmoderated testing)
Recording:
- Zoom (screen + audio)
- Loom (quick recordings)
- OBS (advanced recording)
Analysis:
- Dovetail (organize insights)
- Notion (collaborative notes)
- Miro (affinity mapping)
- Excel/Sheets (metrics tracking)