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Voice user interfaces (VUIs) are becoming all the rage today. But how do you build one that people can actually converse with? Whether you're designing a mobile app, a toy, or a device such as a home assistant, this practical book guides you through basic VUI design principles, helps you choose the right speech recognition engine, and shows you how to measure your VUI's performance and improve upon it.

Author Cathy Pearl also takes product managers, UX designers, and VUI designers into advanced design topics that will help make your VUI not just functional, but great.

Understand key VUI design concepts, including command-and-control and conversational systems
Decide if you should use an avatar or other visual representation with your VUI
Explore speech recognition technology and its impact on your design
Take your VUI above and beyond the basic exchange of information
Learn practical ways to test your VUI application with users
Monitor your app and learn how to quickly improve performance
Get real-world examples of VUIs for home assistants, smartwatches, and car systems



Chapter 1Introduction
A Brief History of VUIs
Conversational User Interfaces
What Is a VUI Designer?
Chatbots
Conclusion
Chapter 2Basic Voice User Interface Design Principles
Designing for Mobile Devices Versus IVR Systems
Conversational Design
Setting User Expectations
Design Tools
Confirmations
Command-and-Control Versus Conversational
Conversational Markers
Error Handling
Don't Blame the User
Novice and Expert Users
Keeping Track of Context
Help and Other Universals
Latency
Disambiguation
Design Documentation
Accessibility
Conclusion
Chapter 3Personas, Avatars, Actors, and Video Games
Personas
Should My VUI Be Seen?
Using an Avatar: What Not to Do
Using an Avatar (or Recorded Video): What to Do
When Should I Use Video in My VUI?
Visual VUI-Best Practices
Visual (Non-Avatar) Feedback
Choosing a Voice
Pros of an Avatar
The Downsides of an Avatar
Conclusion
Chapter 4Speech Recognition Technology
Choosing an Engine
Barge-In
N-Best Lists
The Challenges of Speech Recognition
Data Privacy
Conclusion
Chapter 5Advanced Voice User Interface Design
Branching Based on Voice Input
Disambiguation
Handling Negation
Capturing Intent and Objects
Dialog Management
Don't Leave Your User Hanging
Should the VUI Display What It Recognized?
Sentiment Analysis and Emotion Detection
Text-to-Speech Versus Recorded Speech
Speaker Verification
"Wakeö Words
Context
Advanced Multimodal
Bootstrapping Datasets
Advanced NLU
Conclusion
Chapter 6User Testing for Voice User Interfaces
Special VUI Considerations
Background Research on Users and Use Cases
Designing a Study with Real Users
Early-Stage Testing
Usability Testing
Performance Measures
Next Steps
Testing VUIS in Cars, Devices, and Robots
Conclusion
Chapter 7Your Voice User Interface Is Finished! Now What?
Prerelease Testing
Measuring Performance
Logging
Transcription
Release Phases
Surveys
Analysis
Tools
Conclusion
Chapter 8Voice-Enabled Devices and Cars
Devices
Cars and Autonomous Vehicles
Conclusion
Appendix Epilogue
Appendix Products Mentioned in This Book
Mobile Phone Assistants
Home Assistants
Toys/Other
Apps
Video Games
Watches / Bands
Cars
Appendix About the Author