Q. What is representation multiplicity in the context of substitutivity?

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Q. How does equal opportunity blur the distinction between input and output?

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Q. What is the principle of "If you can see it, you can use it!" according to Thimbleby?

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Q. How is customizability defined with respect to the user interface?

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Q. What is the difference between adaptability and adaptivity in the context of customizability?

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Q. What is an example of lexical customization in customizability?

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Q. What does observability refer to in the context of robustness?

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Q. What is the purpose of browsability in achieving robustness?

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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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