EVENT MODEL OF HUMAN SYSTEM INTERACTION

Interaction objects (interactors) are abstract structures that provide a link between rigorous approaches to software development and user-o riented aspects of interaction. The focus of the paper is on the secon d role of interactors; in particular, how a formal model of interactio n can be used to classify and clarify various properties of interactiv e behaviour that are important from a user-oriented viewpoint, The for mal model used in this discussion abstracts away from distinctions bet ween states, events, and renderings; when needed, these concepts are i ntroduced as various projections on the basic model.