The experiment detailed in this paper was carried out at theFrench company EDF. It gives both points of view, of the expert and ofthe client, on how the EDF CAD department made its choice of a CASE(computer-aided software engineering) method and tool. The CASE expertexplains how the assessment was defined and then conducted starting froma rather wide request, and how a set of choice elements was establishedto help decision-making. The EDF-CAD client is an “aposteriori” analysis, involving the different steps from theidentification of the need until the final choice. The conclusions showa large agreement on the main results: a maturation step, client andexpert getting to know more of each other, thus establishing a mutualconfidence relationship; the will to succeed to choose, remainingclear-minded, for a method and a tool will not solve all problems; anobjective comparison approach and a joint assessment consideringnontechnical criteria and mostly the client's needs and requirements, acontinuous help on behalf of the CASE expert not ending with thedecision file, but going through integration of the method and tool inclient projects
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