A Theoretical Introduction to Numer. Analysis by V. Ryaben'kll, S. Tsynkov

By V. Ryaben'kll, S. Tsynkov

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We consider some of the more complex implications of these phenomena to human factors issues related to three important aspects of our sensory processing: contrast sensitivity (CS), night vision, and color vision. SENSORY PROCESSING LIMITATIONS Contrast Sensitivity Our unfortunate driver could not discern the wiper control label, the map detail, or the pothole for a variety of reasons, all related to the vitally important human factors concept of contrast sensitivity. Contrast sensitivity may be defined as the reciprocal of the minimum contrast between a lighter and darker spatial area that can just be detected; that is, with a level of contrast below this minimum, the two areas appear homogeneous.

Efficiency of jobs and tasks. Adequacy of employee training. Organizational design and job structures. Reward or incentive policies. Information exchange and communication. After evaluating these facets, the human factors specialist develops a list of recommendations for the plant. These recommendations go beyond interface and interaction design for individual pieces of equipment. An example is given by Eckbreth (1993), who reports an ergonomic evaluation and improvement study for a telecommunications equipment manufacturer.

Usability testing conducted early in the design cycle can consist of having a small number of users evaluate rough mock-ups. As the design evolves, a larger number of users are asked to use a more developed prototype to perform various tasks. If users exhibit long task times or a large number of errors, designers revise the design and continue with additional usability testing. Comprehensive human factors test and evaluation has a long history and provides a more inclusive assessment of the system than does a usability evaluation (Chapanis, 1970; Fitts, 1951).

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