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By Christopher D. Wickens, John Lee, Yili D. Liu, Sallie Gordon-Becker
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Thus, in this section heuristic evaluation will refer to a systematic evaluation of the product design to judge compliance with human factors guidelines and criteria (see O’Hara, 1994, for a detailed description of one method). Heuristic evaluations are usually performed by comparing the system interface with the human factors criteria listed in the requirements specification and also with other human factors standards and guidelines. This evaluation is done by usability experts and does not include the users of the system.
The high spatial frequencies on the right side of Figure 4 characterize our sensitivity to small visual angles and fine detail (and hence reflect the standard measurement of visual acuity), such as that involved in reading fine print or making fine adjustments on a vernier scale. Much lower frequencies characterize the recognition of shapes in blurred or degraded conditions, like the road sign sought by our lost driver or the unseen pothole that terminated his trip. Low contrasts at low spatial frequencies often characterize the viewing of images that High Contrast Contrast Sensitivity Low Contrast Sensitivity 1 4 8 20 Cycles/Degree FIGURE 4 Spatial frequency gratings, used to measure contrast sensitivity.
Figure 4 shows a simplified house of quality for the digital camera design. The rows represent the objectives. The columns represent the performance requirements and system features. The task analysis and user preferences identify the importance or weighting of each requirement, which is shown in the column to the right of the objectives. These weightings are often determined by asking people to assign numbers to the importance of the objectives, 9 for very important, 3 for somewhat important, and 1 for marginally important objectives.