Elaboration of the Contextual Graphs representation: From a conceptual framework to an operational software

The paper presents the current status of research on context modeling and management that emerges from several real-world applications since 25 years. We now have a robust conceptual framework and its implementation as a piece of software called Contextual-Graphs (CxG) platform. The context modeling and management were limited to few relevant aspects of context in each application. Working on several applications imposed to develop a robust conceptual framework and software that are independent of applications. The CxG formalism is the syntax and the domain models are the semantics. The CxG formalism relies on four elements (action, contextual element, activity and executive structure of independent activities) and about 200 models were developed as contextual graphs. This success comes from the fact that the CxG formalism is used for modeling human behaviors during task realization, not task models. The robustness of the CxG formalism offers challenging perspectives in crucial domains like weak-signal management in emergency rooms or crisis or security problems.