In this paper, we describe the C
s Inspector, a software tool providing user interface designers and developers with a semantic network in order to control the plasticity of their User Interfaces (UI) at run-time. Thanks to a set of predefined relationships, the semantic network links together various concepts ranging from the final UI (i.e., the UI described in terms of techno lo gical spaces) to the concrete and abstract UIs (i.e., the UI respectively described in terms of concrete interaction objects independently of any technological space, and abstract individual components and containers independently of any interaction modality) up to the tasks and concepts of the interactive system. In this way, plasticity can be addressed at four levels of abstraction (task and concepts, abstract, concrete, and final user interface) for forward, reverse, and lateral engineering. The end user exploits the semantic network at run time to adapt his/her UI to another context of use by identifying, selecting, and applying plasticity suitable operations.