In order to optimize the appropriateness, utilization, and appropriation of an evaluation process, which is often expensive in terms of time and money, we have recently encouraged the increasingly active involvement of various stakeholders (Cousins et Chouinard, 2012). Beyond this orientation, there are important issues concerning the selection and the degree of participation of these stakeholders, as well as obstacles and conditions facilitating their participation (Hurteau, Houle et Marchand, 2012). Firstly, this article is based on the evaluation of Relais-Pères, carried out as part of participatory action research over more than ten years in order to specify the conditions and obstacles encountered in a framework of services. Secondly, attention is given to issues linked to the specifics of an evaluative approach in the interest of appropriation by partners in this approach.