The decision for a company to adopt an ecodesign process approach raises some difficulties highlighted by many authors. Ecodesign integration strategies, particularly in the small and medium size firms (SME), are mostly intuitive and unconscious. This situation reveals the need for a tool to help the ecodesign integration. Our research focuses on the development of a trajectory model to integrate ecodesign in the SME’s. This particular strategy requires a step by step process that consists of combining and distributing specific “drivers” at the correct time. The tool proposed is a combination and the progressive leading of three elementary strategies: "Methods and tools process", "organizational management process" and "company development strategy process”. To achieve this, we have conducted two surveys among the experts and the companies that are the pioneers in the area of ecodesign. Also, we have done an experimentation of a trajectory model in a power distribution products manufacturer (Transfix)