This article presents on the one hand the concepts to build a longitudinal evaluation process (LEP) of a learning platform in a research context and on the other hand the organization of this LEP. Evaluations' objectives are threefold: at the research level, at the technical level and at the societal level. At the research level, this LEP is inscribed in a pragmatic constructivism posture to work iteratively and incrementally from the field. At the level of project monitoring, the LEP is built on the basis of the tools of the quality approach which can guarantee a traceability of the production of data and results. The case study chosen is the LabNbook platform to learn experimental sciences in a context of higher education.