Organizations undergoing significant changes. This requires careful management. We use human resource management practices in organizational change management. Indeed, jobs change and influence the performance of the company. Human characteristics (such as attitudes, competences, etc.) influence the performance of organization. We will consider these characteristics as variables that contribute first to the explanation of the change success and second to estimate the change effort required when assigning a role to an operator. The practice of the same human task by several people allows the collection of training examples related to this task. In the general aim of building an expert system in managing organizational change, we are interested in this paper to supervised learning of these training examples. The ultimate goal is to have a feedback and decision support in organizational change management and to design an expert system about this topic.