The purpose of this paper is to discuss the features of our TERESA environment and show how it can support design and development of multi-device interactive services. This is a tool for model-based design of multi-device interfaces. It considers three levels of abstractions (task model, abstract user interface and concrete user interface). For each of them a specific language has been defined and used. The task and the abstract user interface levels are described by platform-independent languages, which allow designers to focus on conceptual aspects and to avoid dealing with a plethora of low level details.
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