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By M. Lehto, J. Buck

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In addition, this appendix describes some particularly useful additions to this topic for ergonomic applications. Those readers with some background can review the topic before seeing the extensions. 13 ch01_8129_Lehto_LEA 5/9/07 5:07 PM Page 14 14 Introduction to Human Factors and Ergonomics for Engineers new system. While training is usually a good idea after the design is completed, an important principle prior to design completion is: Principle 1-14. Involve personnel in planning and implementing the changes from both a system-wide and individual perspective, with particular emphasis on making the implementation process minimally disruptive.

From a more general perspective, critical incident analysis entails interviewing people who have worked with existing systems or products to discover maintenance problems, operating difficulties, and other concerns that might or might not need to be fixed in the design of the new product. Critical incident studies reveal the importance of robust products and processes, those whose performance and worth are not detrimentally affected by variations of use or by an environment outside of an expected range of values.

Components with strong linkages should be placed closer together, if possible. Numerous forms of the fourth activity, simulation, have been devised. As discussed in later chapters,10 both digital computer simulation and operator-in-the-loop simulation are appropriate to product design. The fifth activity, controlled experimentation, is especially important in ergonomics. As the name implies, this activity involves interrogating nature under controlled conditions so that other influences do not interfere.

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