Abstract
Programming environments need a specially tailored component which handles the interaction between the user and a variety of tools. In this paper, the principles that guided the implementation strategy for such a component in the development of the GRASPIN environment are reported. The functionalities of the User-Tool Interaction Subsystem are presented and the way they were incorporated in the overall architecture is described. In particular, focus is placed on the development of the user interface of a software engineering environment based on the properties of uniformity, consistency, and customizability. Our experience has shown that in addition to these properties, a proper mixture of “minor” facilities, such as history editing, online help, and command completion, when uniformly applied, can make the difference between a good and bad user interface.
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