Measuring the User Experience, 2nd Edition

Chapter 4

Performance Metrics

Contents

4.1 Task Success

4.1.1 Binary Success

4.1.2 Levels of Success

4.1.3 Issues in Measuring Success

4.2 Time on Task

4.2.1 Importance of Measuring Time on Task

4.2.2 How to Collect and Measure Time on Task

4.2.3 Analyzing and Presenting Time-on-Task Data

4.2.4 Issues to Consider When Using Time Data

4.3 Errors

4.3.1 When to Measure Errors

4.3.2 What Constitutes an Error?

4.3.3 Collecting and Measuring Errors

4.3.4 Analyzing and Presenting Errors

4.3.5 Issues to Consider When Using Error Metrics

4.4 Efficiency

4.4.1 Collecting and Measuring Efficiency

4.4.2 Analyzing and Presenting Efficiency Data

4.4.3 Efficiency as a Combination of Task Success and Time

4.5 Learnability

4.5.1 Collecting and Measuring Learnability ...