Q. In which situations might laboratory observation be the only option for usability evaluation?

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Q. What limitation of laboratory studies can affect the accuracy of observations made during evaluation?

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Q. Which expert-based evaluation approach involves evaluators stepping through a sequence of user actions to identify potential usability problems?

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Q. What is the primary focus of cognitive walkthroughs in terms of user interaction?

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Q. What is the primary goal of heuristic evaluation?

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Q. What scale is commonly used to rate the severity of usability problems identified through heuristic evaluation?

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Q. What is the purpose of using previous studies in evaluation?

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Q. Which evaluation style involves observing the interaction between users and systems in their natural work environment?

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Q. What is a key advantage of field observation over laboratory studies in usability evaluation?

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Q. In the context of field observation, what is the "Heisenberg uncertainty principle" referring to?

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Q. When might laboratory testing be more suitable than field observation for usability evaluation?

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Q. What should be considered when deciding between field studies and laboratory studies for usability evaluation?

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Q. What is one of the key advantages of using a controlled experiment for evaluating a design or aspect of a design?

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Q. In the context of experimental evaluation, what role do experimental conditions play?

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Q. What is the importance of choosing participants closely matching the expected user population in experimental evaluation?

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Q. According to Nielsen and Landauer, how many participants are recommended for usability testing to uncover usability problems?

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Q. What factor determines the appropriate sample size for a controlled experiment in usability evaluation?

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Q. In an experimental evaluation, what is the purpose of independent variables?

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Q. What is a level of an independent variable in an experimental study?

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Q. What is the role of dependent variables in an experimental evaluation?

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