Sect. I. Toward More Usable Software. 1. Software for Use: Usage, Usability, and User Interfaces. 2. Built-in Usability: A Usage-Centered Design Approach. 3. In Principle: Rules and Principles of Usage-Centered Design -- Sect. II. Essential Models for Usability. 4. Users and Related Species: Understanding Users and User Roles. 5. Working Structures: Task Modeling with Essential Use Cases. 6. Interface Architecture: Interface Contents and Navigation -- Sect. III. Creating the Visual Design. 7. Designing the Dialogue: Layout and Communication. 8. Practical Widgetry: Choosing and Designing Visual Components. 9. Innovative Interfaces: Creative Interface Engineering and Custom Components -- Sect. IV. Completing the Design. 10. Expressing Solutions: Implementation Modeling and Prototypes. 11. Help Me If You Can: Designing Help and Helpful Messages. 12. Once a Beginner: Supporting Evolving Usage Patterns. 13. In Place: Fitting the Operational Context.

14. Same Game, Different Fields: Special Applications, Special Issues. 15. Usage-Centered Design Applied: The TeleGuida Case -- Sect. V. Assessment and Improvement. 16. Better Next Time: Improvement by Inspection and Review. 17. By the Numbers: Measuring Usability in Practice. 18. Test Scores: Laboratory and Field Testing of Usability -- Sect. VI. Organizing and Managing the Process. 19. Code and You're Done: Implementing Interfaces. 20. Using Your Users: Users in the Development Process. 21. Getting Organized: Usability in the Larger Context -- App. B. Eleven Ways to Make Software More Usable: General Principles of Software Usability -- App. D. Forms for Usage-Centered Design -- App. E. Subjective Usability Scales for Software (SUSS).