Abstract
Formulating precise descriptions of human-computer interactions is a prerequisite for the principled design, implementation and evaluation of interactive systems. This paper reports an exercise in interaction specification using Foley and Van Dam's (1982) multilayered method of documenting the design of a user-computer interface. The specification was used to communicate the intended behaviour of a Forms Helper system from a design team to an implementation team. The ease with which the interaction could be represented at each of Foley and Van Dam's four levels of abstraction is discussed, and recommendations are made for improving the method in places where its guidance was unclear or inadequate. The value of the method is examined prior to a discussion of the potential role of such specifications in the design and development cycle .
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