... early testing and evaluation should be carried out with the users. The final principal says that the design needs to be highly interactive and cycles of 'design-test with users-redesign' should not be uncommon. There is no one right solution for users and so designers should aim to produce an evolving system which enhances the users' needs on every iteration. Perlman (1988) constructed a typical user-centred design cycle: The user's needs and capabilities are collected in a synthesised manner, and it is this that dominates early design. The primary techniques of gaining this information are task analysis, requirement analysis and usability tests. A conceptual model of the system can be developed with this information . Part of the conceptual model involves the decision of dialogue type, to be used between user and system, and this shapes the systems image. The conceptual design of an interface generally involves creating sketches on screens ...

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