TAMODIA '04 Proceedings of the 3rd annual conference on Task models and diagrams
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A task-centred approach to systems design and evaluation is presented. In particular, task analysis and task modelling are described as major human factors tools for a structured user-centred and task-centred design methodology. It will be shown how these techniques can be exploited throughout the development process, and their beneficial effects in terms of software usability.The method is presented discussing the experience of the Esprit Project CHARADE, an integrated system for handling environmental emergencies. Starting from the notion that usability means "usable to perform some tasks", the role of task analysis and task scenario and their contribution to system design and evaluation are discussed.