Quality assurance and accreditation agencies are developing for many years: in France engineering education institutions are accredited by Commission des Titres d'Ingénieur (CTI) since 1934, and many agencies have already done several cycles of their periodic evaluation in the institutions. Very often, the deans of those evaluated institutions say that it is not possible to continue because, together with their team, they spend huge amounts of time writing self-evaluation reports or preparing audits, instead of making their institutions evolve. These two activities are really very time consuming for institutions. On the other hand, the human cost of evaluation is very high for auditors too, and much time is also spent by evaluators reading the same documents as in the previous audit or visiting institutions that have not really changed, and then writing and presenting the results of those investigations. Everywhere in the world there are reflexions or attempts to make those accreditations lighter, some have not yet results such as in HFKG (Federal Council of Switzerland) [1]. We will limit our presentation to the French speaking countries that are Belgium and France where this new process is beginning in October 2018. In 2017, it was decided to launch a reflexion on a leaner accreditation process; this took place in CTI nearly at the same time as Belgium AEQES (Agence pour l'évaluation de la qualité de l'enseignement supérieur) began to have ideas of the same kind. Nowadays HCERES (Haut Conseil de l'évaluation de la recherche et de l'enseignement) which is our generalist agency is also having a reflexion on those fields for private institutions, it is called "audit adaptés" which means fitted audits, this process changes only the duration of audits but not the SER of institutions. It took many meetings in CTI to define what was really important to be observed and understood in institutions when they were accredited; this common reflexion, where external experts contributed, was in itself a result for the CTI. We first got to a common view on the necessary elements that make us think that a complete accreditation process is not necessary and then we established the documents necessary for this lean accreditation, the organisation of audit itself being also fitted to this new process. The paper presents the step and conclusions of this work done inside CTI as well as some elements of the work done on Belgium on the same subject, because it is interesting to compare these approaches for two reasons: first one is that AEQES is our French speaking neighbour but also because we have common accreditation procedures in Belgium institutions, so CTI's members will have to participate to a lean accreditation experimentation different from what has been decided in France. Concepts underlying the two demarches are different, which gives richness to this double participation, we present will this paper in a way that we discuss this point.