Abstract
Inter-organizational projects struggle to build a sense of joint belonging and a culture of cooperation. In evaluating the social processes of collaboration in inter-organizational projects, organizational identity is considered a core concept. To extend existing knowledge of how collaborative identity is formed in inter-organizational infrastructure projects, the study investigates how the specific characteristics of temporary organizations (time, team, task and context) influence identity formation activities. A case study of the first Finnish infrastructure alliance project identifies six key activities supporting the formation of collaborative project identity: (1) articulating a joint vision for collaborative project identity; (2) converging on mutual conceptions of collaborative project alliance philosophy; (3) attaining a shared collaborative mentality; (4) designing ways of working with multiple identities; (5) attaining distinctiveness and (6) legitimizing activities. The findings indicate that identity formation activities are context-dependent, and that the formation of organizational identity differs between temporary and permanent organizations. The findings illuminate how managers can build a collaborative project identity.