Usability Testing: analyzing data
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Transcript of Usability Testing: analyzing data
• Compile
• Summarize data
• Analyze data
• Develop recommendations
• Produce the final report
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Data Analysis
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next 2 weeks:
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Step 1: Compile
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Get it into a pile.
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Get your piles sorted.
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Ideally:
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compile as you test.
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further test the test.
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keep the data legible.
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• Type handwritten notes
• Verify data captures
• Back up files
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Organize raw data.
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Do whatever it takes to get it done.
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• lists
• tallies
• matrices
• stories
• structure models
• flow diagrams
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Goal:
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Step 2: summarize
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1. task accuracy
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number of errors made per task
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• categorize errors by type
• ommission
• commission
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# of participants who performed:
• successfully
• successfully but with some assistance
• assistance types, tasks, products
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Vital Statistics:
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% performing successfully, including those who needed assistance
• regardless of time limits
• regardless of assistance needed
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If this percentage is very low, you’ve got a
serious problem.
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% performing successfully
• including those who corrected errors
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% performing successfully within benchmark
• indicative of efficiency
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2. task timings
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summarize preference data
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Limited choice questions:
• Sum by choice
• Chart trends
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Free-form questions:• Group into meaningful categories
• Ex: particular screen, doc section, etc.
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Summarize other measures
• Unnecessary returns to main navigation
• Number/type of hints and prompts
• Times site map was accessed
• Points of hesitation (and for how long)
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Summarize by Group/Version
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(see pages 255 - 259)
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3: analyze data
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What didn’t succeed?
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What were the difficulties?
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What were the error sources?
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Prioritize problemsby severity
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Severity descriptions & definitions: p. 262
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