In the multi-layered structure of megaprojects, organizational cultures emerge within different temporary multi-organizational teams (TMOs) responsible for execution. The cultural ecosystem in megaproject is conceptually articulated at the levels of their institutional settings to increase sustainable delivery. TMOs as meso-level coalitions are complex systems comprised of diverse public-private organizations responsible for delivering individual projects within the programme. Understanding these social and structural milieus provides a new groundwork for conceptual development and theorization of megaproject culture formation. Mirrored through its dynamics, ecology and development, this paper unravels how cultural features are affected by environment, effected in development, and transformed during the megaproject life. Contributions are made by shifting discourse towards a dynamic understanding of causal diversity that shape culture within TMOs to improve transferable practice. This investigative strategy challenges extant normative viewpoints. Indicating the need to reconsider existing perceptions and to embed norms of reflexivity beyond the mainstream megaproject management thinking
