Because the function analysis provides a description independent of any particular physical implementation, it provides useful insights that are independent of any particular system, as demonstrated by the discussion of human factors issues and network analysis. The multilevel approach to a functional description places the functional description in the context of system objectives and the concrete physical features of potential systems. This highlights the variety of design alternatives. This may provide a useful representation of the designer's problem space, which could be a basis for the effective presentation of human factors design guidelines. Thus, the functional description can provide a common language that links an engineering description of ATIS/CVO with a psychological description of driver needs, limits, and capabilities.
This research was supported by contract DFTH61-92-C-00102 from the U.S. Federal Highway Administration. I would like to thank Mireille Raby, William Wheeler, Thomas Dingus, and Mellisa Hulse for their contributions to the research referred to in this chapter.
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