This article questions the forms, modalities and issues in short vocational training. The evaluation is seen as both the outcome of training and the upstream direction of its implementation: it is both the purpose and the genesis of the action. Presented as a modality of rationalization for performance optimization, evaluation is particularly grappling with industrialization issues. As an addition to training professionals, evaluation guides the way actors act and think about their action in organizations. Equipped and instrumented, it finally involves a fine-tuned approach to mediations and, first and foremost, to the computerized tools that give it form.