Abstract
This chapter presents a practical GOMS model methodology for user interface design. The basic approach to user-interface design using the cognitive complexity approach would be that the iterative design process would be followed, but with the evaluation of a proposed design being done with simulation techniques rather than actual human user testing; only a final test of the design would require actual user testing. Additional user testing would be involved to develop aspects of the design, such as screen layout, that are not directly addressed by an analysis of the procedures entailed by the design. There are several problems in using the cognitive complexity approach as a design tool that have become clear from technology transfer. The chapter presents two critical problems: (1) the difficulty of constructing production rule simulation models, and (2) the difficulty of doing, in a standardized and reliable way, the detailed task analysis required to construct the representation of the procedural knowledge that the user should have to operate the system.
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