Abstract
Computer science has now recognized that in holistic systems design the designer must include not just the terminal, but also the user within the boundaries of the system. Users, particularly if they are computer naive, require a conceptual model of the computer system so that they can form a clear idea of what the system is doing and what it can do. This model is communicated to the user by the representation of the system which appears at his terminal. Existing techniques for the design of terminal dialogues do not include methods for representing conceptual models, so that new techniques are needed. If these are to be reliable they must be based in theory rather than just the intuitions of individual designers. This article examines current theory and practice in psychology, computer sicence and process control, and seeks a consensus for the design of representations suitable for describing the operations of on-line computer systems via their terminal interfaces.
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