The aim of this exploratory paper is to generate a method of evaluating design interventions for organizational change in third sector and to apply this method to an ongoing design research project with a national social cooperative in Italy. The evaluation model is a way to present what changes and impacts that design, especially strategic design, could bring to organisations and how these results could enable organisations to fulfil its missions in a more “human-centered” process. The results will consist of a theoretical framework to evaluate, taking social cooperative as one example, and the applied results in an empirical project. In the future, this framework will be continuously developed in this and also other similar projects.