Complex systems that increasingly involves devices such as sensors, smart-phone, interconnected objects and computers, results in what is called ambient systems. One of today's challenges in the framework of ubiquitous computing concerns the design of ambient systems. The major difficulty is to propose a compositional adaptation of devices which appear/despair over time. WComp environment is a prototyping and dynamic execution environment for ambient intelligence applications including a management mechanism allowing extensible interference between devices. A new approach based on the definition of strategies validated using discrete-event simulation is proposed in order to take into account conflicts and compositional adaptation of devices in ambient systems. These are defined and validate using a DEVS ( Discrete EVent system Specification) formalism to be integrated into a prototyping and dynamic execution environment for ambient intelligence applications. The proposed solution allows the designers of ambient systems to define the optimum matching of all components to each other. One pedagogical example is presented ( switch-lamp system) as a proof of the proposed approach.