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14. Why is the human interface one of the most important but difficult areas of safety critical systems? What must the system designer consider?
Even the most highly trained and alert operators are prone to boredom when they are usually not needed for normal operation, and panic when an unusual situation occurs, stress levels are raised, and lives are at stake. [ The HCI must give appropriate feedback to the operator to allow him or her to make well informed decisions based on the most up to date information on the state of the system. High false alarm rates will make the operator ignore a real alarm condition. Methods for determining the effectiveness of an HCI, such as heuristic evaluation, cognitive walkthroughs, and empirical
evaluations like protocol analysis, exist, but are often cumbersome and do not provide conclusive data on the safety and usability of an HCI. System designers must insure that the HCI is easy and intuitive for human operators to use, but not so simple that it lulls the operator into a state of complacency and lowers his or her responsiveness to emergency situations. source: ]
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Expert answered|sharpies|Points 7068|
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Asked 3/15/2012 11:08:48 AM
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