Q. What is the main difference between a formal proof and a rigorous proof?

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Q. What is the "formality gap" referred to in the context of validation proofs?

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Q. What may dictate the extent of proofs carried out in a design project?

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Q. Which type of proof is more commonly used for verification in software development?

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Q. What does the "formality gap" imply for the validation of interactive systems?

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Q. How can the confidence in subjective proof be increased during validation?

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Q. What is the importance of design notations in narrowing the formality gap for validation?

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Q. In the context of software development, why are managerial issues of design important?

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Q. What is the distinction between the technical perspective and the managerial perspective of the software life cycle?

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Q. What does signing off on a requirements specification indicate?

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Q. Why is it worth the effort to understand and improve the interactive system design process?

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Q. Why is it challenging to determine all the requirements for an interactive system from the start?

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Q. How does the formality gap impact the validation of interactive systems?

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Q. How does the life cycle of interactive systems differ from traditional software life cycles?

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Q. What role do experts play in the validation of interactive systems?

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Q. What is a key challenge in managing the development of interactive systems?

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Q. What is the primary challenge in predicting human behavior for designing interactive systems?

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Q. Why are some models of human users not useful at early and abstract stages of design?

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Q. What is the importance of conducting experiments for testing usability properties of designs?

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Q. What is the significance of making experimental systems resemble the final product?

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