In this working paper, we will examine in which way the participative management can be a key success factor in a context of organizational change. We tried to determine whether the use/implementation of participative management and its tools is perceived as an increasing success factor of the mergers and acquisitions process. One of the interest of this study is to bring back a managerial aspect, nearly forgot in Europe but yet still relevant in Canada, that has proven is great interest within different studies over last decades and to apply the previous researches to a specific event in the life of a company, but also to a really particular context which is the one of a SME employing people with disabilities. To perform this research, we focused on the perception of participation, and its tools, that have workers and managers though a qualitative and a quantitative survey. The perspectives of this study open the way to more in depth researches in order to define audit processes and advises about the implementation of participative management (tools) to influence positively the probabilities of success for mergers and acquisitions.