A key moment in system engineering is when one or more architectural designs of systems, likely to meet customer requirements, are devised. In the Space world, this stage of a project is called open "phase 0". At CNES, an organisation called PASO (Plateau d'Architecture des Systemes Orbitaux) is responsible for conducting all phase Os for all satellite projects. Led by a standing committee, this organisation calls upon correspondents in specialised departments for each pre-project. In some cases the team works in the "Concurrent Engineering Centre", inaugurated in 2005. One or more scenarios are produced using a methodological approach based on the concept of a 'driving parameter'. Each scenario represents a trade-off between a mission, a system which achieves the mission, and programmatics perspectives. This approach, illustrated here by the pre-project SAMPAN, allows for a solid relationship between the customers of the system and the designers of technical solutions. In other cases it makes it possible to overcome a lack of consistency and clarity in the request. If it is true that the success of a project depends on its beginnings, then this is undoubtedly a more efficient approach to customer satisfaction.
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