Human Factors Criteria for the Design and Acquisition of ... - FAA
Human Factors Criteria for the Design and Acquisition of ... - FAA
Human Factors Criteria for the Design and Acquisition of ... - FAA
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Keyboards June 20049.6.1 Toggle keys/Dual state keysf. Dedicated <strong>for</strong>matting keys- Keys <strong>for</strong> text <strong>for</strong>mattingoperations such as <strong>the</strong> space bar, Tab key, <strong>and</strong>Backspace key.g. Numeric keypad- Number keys used <strong>for</strong> frequentnumeric input.• 9.6.1.1 Indication <strong>of</strong> state. Dual state (toggle) keys shallclearly indicate <strong>the</strong>ir operational (functional) status to <strong>the</strong>user. [Source: ISO 9241-4, 1998]9.6.1.2 Location <strong>of</strong> status indicator. If indicator lights areused to indicate <strong>the</strong> status <strong>of</strong> dual state keys, <strong>the</strong>y should beclearly labeled or close to <strong>the</strong> associated keys. [Source: ISO9241-4, 1998]9.6.2 Arrow keys• 9.6.2.1 Two-dimensional cursor control. Keyboards shallprovide <strong>for</strong> movement <strong>of</strong> <strong>the</strong> cursor in two dimensions byincluding a set <strong>of</strong> arrow keys. [Source: ANSI, 1988; DOE-HFAC1, 1992; NUREG 0700, 2002]• 9.6.2.2 Arrow key layout. Arrow keys shall be arranged ina two dimensional spatial configuration reflecting <strong>the</strong>direction <strong>of</strong> actual cursor movement. Acceptablearrangements are a T shape, inverted T, diamond, orimbedded diamond shape. [Source: Reger, Snyder & Epps, 1987]Exhibit 9.6.2.2 Arrow key layout9-18
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