The primary objective of this chapter is to characterise the problem addressed by MUSE, a structured human factors Method for Usability Engineering. To this end, existing problems of human factors contributions to system development are reviewed; namely, existing contributions are poorly timed and contextualised to the support required at different stages of the system design cycle. As a result, the relevance, format and granularity of human factors contributions are not optimal for effective uptake during design. By establishing the nature of the problems, promising solutions may then be assessed. Arguments supporting a structured analysis and design method, such as MUSE, are thus exposed.

General Problems of Human Factors Contribution to System Development

Recent developments in computer technology (e.g. the availability and affordability of personal computers and the rapid diversification in computer applications) have resulted in a shift from mainframes to personal computers. Today, such interactive computers have made significant inroads into both the workplace and the home. Consequently, the user base of computers has widened considerably.

The extended user base, together with market forces, highlighted the importance of designing computer applications that are appropriate in both functionality and usability. The success of Macintosh computers is an example (see also Shackel, 1985 and 1986b; CCTA (Draft) Report, 1988, Annex 1; Shuttleworth, 1987).