**Abstract**

Numerous studies focus on the increasing role that cooperation plays on knowledge creation and the importance of knowledge diversity. However, in dealing with different background, culture, process, and knowledge throughout collaborative project, organizations must improve their practices to access, share and create knowledge. This paper aims at highlighting the complexity of interfirm collaborative projects while analyzing how different factors bolster knowledge sharing between partners depend on project phases. This work supports literature on interactionist approaches and project management to analyze these concepts of collaboration and knowledge sharing. Based on case study of an aerospace cluster, the findings highlight the factors that may enhances the effectiveness of knowledge sharing depend on project phases. We conclude by identifying further conceptual research and implication for research and practice.

**Keywords:** collaboration, ecosystem, knowledge sharing, project
