Q. What challenge do electronic calendar systems often pose to users?

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Q. What is the purpose of using closed (inclusive) and open (exclusive) intervals in formalizing time intervals?

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Q. What is a characteristic feature of temporal Gestalt phenomena in continuous media?

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Q. Why might the notations and models for continuous interaction appear similar?

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Q. Which type of formalism is used to specify system behavior for communication between designers and implementors, as well as for analysis?

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Q. Which type of logic is used to discuss permitted actions and issues of responsibility?

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Q. The PIE model is an interaction model that addresses general classes of systems and describes properties like:

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Q. What issue does the PIE model help uncover?

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Q. Which type of interaction models cover timing properties and user attention?

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Q. What do status–event analysis concepts highlight in interaction models?

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Q. What do hybrid systems deal with in the context of continuous time interactions?

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Q. What is the challenge related to informal notions of time and formal time specifications?

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