Q. What might be a possible reason for not using CCT to represent concurrent plans?

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Q. What is the main benefit of complementing the cognitive user description with a system description in CCT?

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Q. What is a potential limitation of the "production rules" model used in CCT?

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Q. What risk is associated with forming a goal hierarchy?

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Q. In what context can a "natural hierarchy" be particularly useful?

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Q. What is the "closure problem" in the context of early automated teller machines (ATMs)?

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Q. How did banks address the "closure problem" with early ATMs?

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Q. What is a general rule that can be applied to goal hierarchies to avoid the "closure problem"?

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Q. What is the main purpose of using Backus–Naur Form (BNF) rules in the context of dialog modeling?

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Q. How does the BNF description for an interface differ from a programming language?

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Q. In the BNF rule "choose-one ::= position-mouse + CLICK-MOUSE," what does the "+" operator represent?

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Q. How is the complexity of an interface measured using BNF?

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Q. What is the main advantage of using Task–action grammar (TAG) over BNF in dialog modeling?

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Q. How does Task–action grammar (TAG) handle consistency in commands?

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Q. In the context of TAG, what does the term "known-item" refer to?

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Q. What is "congruence" in the context of dialog modeling?

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Q. How does Task–action grammar (TAG) address the issue of user language and world knowledge?

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Q. What are the main challenges posed by display-based systems for traditional goal hierarchical and grammar-based techniques?

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Q. What is the implicit assumption about users' knowledge in traditional techniques?

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Q. In the context of grammar-based techniques, what is the challenge associated with the lowest-level lexical structure?

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