Q. How should browsing commands affect the domain-specific parts of the internal state?

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Q. What does the principle of "defaults" contribute to robustness in the user interface?

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Q. What is the purpose of "reachability" in the context of robustness?

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Q. How does "persistence" contribute to robustness in user interactions?

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Q. How does providing default values contribute to error prevention?

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Q. What is the main difference between static and dynamic defaults?

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Q. How does reachability affect the recoverability of an interactive system?

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Q. What is the significance of persistence in the context of communication acts?

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Q. What is recoverability in the context of user interactions?

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Q. What is the difference between forward and backward error recovery?

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Q. Why is the principle of commensurate effort important for recovery procedures?

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Q. What does responsiveness measure in the context of user-system communication?

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Q. Why is response time stability important in an interactive system?

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Q. What is the purpose of task conformance in the evaluation of interactive systems?

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Q. What does task completeness refer to in the evaluation of interactive systems?

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Q. Why is it important for system services to be suitably general?

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Q. How does task conformance relate to the success of direct manipulation interfaces?

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Q. What is the purpose of standards for interactive system design?

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Q. How do the underlying theories differ between hardware and software design standards?

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Q. Why have hardware standards historically been in place before software standards?

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