Q. Why do some power buttons on computers and hifi devices have a light beside them?

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Q. How do the physically opposite motions of the twist knob on the MiniDisc controller map onto logical effects?

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Q. What is an example of a control that portrays the underlying state it controls by its physical appearance?

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Q. In the context of a MiniDisc controller, what does the twist knob afford?

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Q. Which design consideration forces designers to make trade-offs when designing physical interfaces?

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Q. Why are front-mounted controls considered better for cookers in terms of safety?

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Q. Which type of controls are often used in a microwave to make them easy to clean?

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Q. What are the constraints that designers face when designing physical interfaces?

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Q. Which aspect of design influences the ease of use and engagement with a device?

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Q. What is the significance of the zone of proximal development in education?

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Q. What is "flow" in the context of user experience?

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Q. What is the importance of providing adequate feedback during user interaction with a system?

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Q. Why is it important to involve actual users in the design process of a system?

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Q. What can reduce a user's job satisfaction and performance when interacting with a system?

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Q. How does the presence of other people in a work environment affect worker performance?

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Q. How can users deal with errors in a large-scale interaction scenario?

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Q. What is the importance of allowing users to detect errors in the interaction process?

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Q. When are modal dialog boxes necessary?

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Q. What are modal dialog boxes in the context of interactive systems?

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Q. In older computer systems, what largely determined the order of interaction?

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