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Models allow us to describe complex systems at different abstract and conceptual levels, hence amplify our analytical and problem solving capabilities. However, a lot of human effort and experience is needed to build correct models, and to translate them to concrete artifacts; in our case a usable user interface. This paper introduces the concept of task and pattern models to leverage the process of task modeling, and show how it can help build generic task models, link them, and instantiate them more readily. Once seen as patterns, we will demonstrate that task models can be disseminated and reused more easily by representing them as predefined types.

In this paper we discuss an approach linking GUI specifications to abstract dialog models. Both specifications are based on task models describing behavioral features. It will be shown how first prototypes of interactive systems, which are generated from user interface models, can help to capture requirements. Users can interactively play with prototypes. Tool support is also provided for co-operative work of different users, which starts with abstract canonical prototypes that can evolve to concrete GUI specifications.

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