Task modelling has been entering the development process of web applications. However, modelling web processes from a usage-centred perspective is still challenging due to the strong distinctions of traditional interactive systems and state-of-the-art web applications. This paper proposes the Web-TaskModel approach, by which task model concepts are adapted for the purpose of modelling interactive web applications. The main difference to existing task models is the introduction and build-time usage of a generic task lifecycle. Hereby the descriptions of exceptions and error cases of task performance (caused by, e.g., the stateless protocol or Browser interactions) are on the one hand appended to the task while, on the other hand, being clearly separated.
Abstract. This paper proposes a dialog model for web applications aiming at flexible interface generation. The basic idea is to enable the runtime system to "finalize" the dialog structure. The overall approach follows a task-oriented, user-centered development process, where models of the users' tasks and the user-system dialog play an essential role. In our approach, these models are transferred to the run time system that allows the user to interact with the web application according to the specifications. It is based on an architecture that separates a task controller and a dialog controller, which are responsible for model execution and dialog creation. Throughout the paper, we take care of the special characteristics of web applications and show enhancements of the conceptual models and of the runtime architecture.
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