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

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

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

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

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

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

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Q. Understanding people's personal values is essential in encouraging them to use a device or application. What is the driving factor for their usage?

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Q. When considering the value of a system, what should designers take into account?

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Q. Why is it challenging to encourage people to use a system when the costs are incurred upfront, but the returns may be experienced later?

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