The assessment of the quality of training systems, whether we talk about education or vocational training, requires to consider criteria of economic nature (effectiveness and efficiency) and of social nature (equity), but also of pedagogical nature (balance, considered as the ability of the system to develop in a harmonious way all the different objectives linked to knowledge), of conative nature (engagement, considered as the ability of the system to develop with the learner a real engagement in order to learn and/or to act).