Q. Why is it impossible to formulate a syntactically incorrect move operation in the pick-up-and-drag style of command in the direct manipulation interface?

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Q. How does the direct manipulation interface provide continual visual feedback during drag-and-drop actions?

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Q. According to Norman and Draper, what does the model-world metaphor in direct manipulation systems create for the user?

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Q. In a direct manipulation system, how are input and output expressions related?

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Q. What does WYSIWYG stand for in the context of interfaces?

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Q. What is the implication of a WYSIWYG interface in terms of the mapping between representation and final product?

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Q. What is a limitation of the WYSIWYG paradigm for usability in certain cases?

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Q. What is direct engagement in the context of direct manipulation systems?

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Q. What is the main difference between the direct manipulation paradigm and the language paradigm?

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Q. What is one interpretation of the language paradigm that requires the user to understand the underlying system's structure?

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Q. In the language paradigm, how does the interface handle user requests for information retrieval?

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Q. In the action paradigm, what is a benefit of performing simple tasks using direct manipulation?

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Q. What is one advantage of the language paradigm over the action paradigm for more complicated tasks?

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Q. What is an interesting combination of the action and language paradigms known as?

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Q. What was the name of the innovative information storage and retrieval apparatus described by Vannevar Bush in 1945?

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Q. What was the primary purpose of the memex?

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Q. Who was influenced by Vannevar Bush's ideas behind the memex and coined the term "hypertext" to reflect the non-linear text structure?

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Q. How did Vannevar Bush's memex influence the concept of hypertext?

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Q. How did Ted Nelson's project, Xanadu, differ from the success of hypertext and hypermedia?

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Q. What is a multi-modal interactive system?

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