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Survey
A research method to collect data from a sample
Questionnaire
A tool within surveys with structured questions
Usability Metrics
Effectiveness: Task completion; Efficiency: Speed/resources used; Satisfaction: Subjective user experience
When is it best to use questionnaires?
Redesigning existing systems (identify pain points); Measuring satisfaction
When should you avoid questionnaires?
For open-ended design questions
Validity vs Reliability
Validity = accuracy, Reliability = consistency
System Usability Scale (SUS)
10-item questionnaire scoring usability out of 100, 68 benchmark
Likert scale
Scale with 5-7 balanced points
Demographic Questions
Using ranges, age, gender, ethnicity