Interaction Design Workshop
BIME 591
Winter 2014
• We did some quick prototype evaluations
• This week, we design and administer a usability test…
Last time…
• Administer your user tests
• Collect Results
• Re-design!
Today’s Goals
Scenarios
(Taken from Usability.gov)
Scenarios
(Taken from Usability.gov)
What subjective and objective test metrics will you use?
http://www.usability.gov/how-to-and-tools/methods/planningusability-testing.html
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Successful Task Completion
Critical Errors
Non-Critical Errors
Error-Free Rate
Time On Task
Subjective Measures
Likes, Dislikes and Recommendations
Test Metrics
Choose a moderating technique! One per
group member.
http://www.usability.gov/how-to-and-tools/methods/runningusability-tests.html
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Concurrent Think Aloud (CTA)
Retrospective Think Aloud (RTA)
Concurrent Probing (CP)
Retrospective Probing (RP)
Test Moderation
• Pair up with someone who is not in your group
• One person will facilitate:
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Introduce the system
Tell the subject whether they should ‘think aloud’
Present the scenarios
Track quantitative performance metrics
At the end, ask qualitative feedback questions
• One person with be the test subject
• Do one round, then switch roles!
User Testing Today…
System Usability Scale
http://www.usability.gov/how-to-andtools/methods/system-usability-scale.html
http://www.measuringu.com/sus.php
Post-Test Evaluation
• Now put that feedback to good use!
Re-Design!
• We’ll make plans for piloting and delivering your system
Next Time