The theoretical reference's frame of our enquire concerning the final assessment of the Centrale Lille engineering training project is inspired by researches on partnership in enterprises (Kaddouri, 1997; Zarifian, 1997) and in other professional fields, teachers training, for example (Zay, 1997, 1994). An analysis grid centred on the assessment and the legitimacy of this assessment for the different participants involved, teachers, enterprises partners, engineering-students has been elaborated from these researches. The first results of this enquiry conducted by means of primary interviews on past viva voce, lead us to think that it is impossible to consider isolated the jury in front of whom a team of students presents the project. The methodological approach will dwell on both the observation of the functioning of the may 2002 juries and on the analysis of the candidate's projects, which are considered as both result and process of a partnership, constitution and evolution of which will be studied.