The formulation of a firm's strategy leans on a competence of a collective, formed by all actors who take part in the decision. But nevertheless the potential of such an approach, it is not obvious to make decisions together : it is not enough to gather various individuals so that they become collectively competent. The aim of this article is to show that organizational identity plays a critical role, in order to facilitate the effective mobilization of a decision-making collective skill. We conducted a qualitative survey with 57 top managers, experts and members of board of cooperatives. This survey permitted to put in evidence a typology of organizational identity and to show that it influences the degree of collective competence during decision processes. The results allow us also to propose some means, to strengthen the capacity to mobilize a collective competence during strategic decision-making. And they bring to light a link between collective competence and firm's performance.
