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Front Cover; Measuring the User Experience; Copyright Page; Table of Contents; Preface; Acknowledgments; CHAPTER 1 Introduction; 1.1 Organization of This Book; 1.2 What Is Usability?; 1.3 Why Does Usability Matter?; 1.4 What Are Usability Metrics?; 1.5 The Value of Usability Metrics; 1.6 Ten Common Myths about Usability Metrics; CHAPTER 2 Background; 2.1 Designing a Usability Study; 2.1.1 Selecting Participants; 2.1.2 Sample Size; 2.1.3 Within-Subjects or Between-Subjects Study; 2.1.4 Counterbalancing; 2.1.5 Independent and Dependent Variables; 2.2 Types of Data; 2.2.1 Nominal Data
2.2.2 Ordinal Data2.2.3 Interval Data; 2.2.4 Ratio Data; 2.3 Metrics and Data; 2.4 Descriptive Statistics; 2.4.1 Measures of Central Tendency; 2.4.2 Measures of Variability; 2.4.3 Confidence Intervals; 2.5 Comparing Means; 2.5.1 Independent Samples; 2.5.2 Paired Samples; 2.5.3 Comparing More Than Two Samples; 2.6 Relationships between Variables; 2.6.1 Correlations; 2.7 Nonparametric Tests; 2.7.1 The Chi-Square Test; 2.8 Presenting Your Data Graphically; 2.8.1 Column or Bar Graphs; 2.8.2 Line Graphs; 2.8.3 Scatterplots; 2.8.4 Pie Charts; 2.8.5 Stacked Bar Graphs; 2.9 Summary
CHAPTER 3 Planning a Usability Study3.1 Study Goals; 3.1.1 Formative Usability; 3.1.2 Summative Usability; 3.2 User Goals; 3.2.1 Performance; 3.2.2 Satisfaction; 3.3 Choosing the Right Metrics: Ten Types of Usability Studies; 3.3.1 Completing a Transaction; 3.3.2 Comparing Products; 3.3.3 Evaluating Frequent Use of the Same Product; 3.3.4 Evaluating Navigation and/or Information Architecture; 3.3.5 Increasing Awareness; 3.3.6 Problem Discovery; 3.3.7 Maximizing Usability for a Critical Product; 3.3.8 Creating an Overall Positive User Experience; 3.3.9 Evaluating the Impact of Subtle Changes
3.3.10 Comparing Alternative Designs3.4 Other Study Details; 3.4.1 Budgets and Timelines; 3.4.2 Evaluation Methods; 3.4.3 Participants; 3.4.4 Data Collection; 3.4.5 Data Cleanup; 3.5 Summary; CHAPTER 4 Performance Metrics; 4.1 Task Success; 4.1.1 Collecting Any Type of Success Metric; 4.1.2 Binary Success; 4.1.3 Levels of Success; 4.1.4 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 Errors4.3.2 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 Data; 4.5.2 Analyzing and Presenting Learnability Data; 4.5.3 Issues to Consider When Measuring Learnability; 4.6 Summary; CHAPTER 5 Issues-Based Metrics
Front Cover; Measuring the User Experience; Copyright Page; Table of Contents; Preface; Acknowledgments; CHAPTER 1 Introduction; 1.1 Organization of This Book; 1.2 What Is Usability?; 1.3 Why Does Usability Matter?; 1.4 What Are Usability Metrics?; 1.5 The Value of Usability Metrics; 1.6 Ten Common Myths about Usability Metrics; CHAPTER 2 Background; 2.1 Designing a Usability Study; 2.1.1 Selecting Participants; 2.1.2 Sample Size; 2.1.3 Within-Subjects or Between-Subjects Study; 2.1.4 Counterbalancing; 2.1.5 Independent and Dependent Variables; 2.2 Types of Data; 2.2.1 Nominal Data
2.2.2 Ordinal Data2.2.3 Interval Data; 2.2.4 Ratio Data; 2.3 Metrics and Data; 2.4 Descriptive Statistics; 2.4.1 Measures of Central Tendency; 2.4.2 Measures of Variability; 2.4.3 Confidence Intervals; 2.5 Comparing Means; 2.5.1 Independent Samples; 2.5.2 Paired Samples; 2.5.3 Comparing More Than Two Samples; 2.6 Relationships between Variables; 2.6.1 Correlations; 2.7 Nonparametric Tests; 2.7.1 The Chi-Square Test; 2.8 Presenting Your Data Graphically; 2.8.1 Column or Bar Graphs; 2.8.2 Line Graphs; 2.8.3 Scatterplots; 2.8.4 Pie Charts; 2.8.5 Stacked Bar Graphs; 2.9 Summary
