One has to note that composing existing applications by completely or partly reusing them is a complex task. Nevertheless with the daily appearance of new available applications on any media, the application editors need to perform such compositions more and more to answer the increasing users’ requests. Modeling an application for composition or just determining by which point of view on applications make this composition is not easy. Works exist, but generally deal or ensue from only a single point of view : the "Functional Core" point of view in Software Engineering field, the "Task" one or "User Interface" one in Human Computer Interaction (HCI) field. This thesis defines a new approach based on a complete application model (functionnal, task and user interface). It enables an user to navigate between those different models in order to select consistent sets. These last ones are composable by substitution. An implementation of this approach was used to perform user tests whose results consolidate benefits of a complete model.
