Conclusion
Theoretical contributions
This paper contributes to the discussion on sustainable project management, particularly in large infrastructure projects that have long-lasting effects on society. We showed evidence from a road tunnel construction project that took place in a central environmentally and socially sensitive context and had a significant influence on various stakeholders. Complementing the dominant indicator-centric view of sustainable project management, the findings show that a more holistic control package is used in sustainable project management, different control mechanisms are used differently for the different dimensions of sustainability, sustainability control needs to be integrated as part of general project management, and internal project control needs to be complemented with effective project sustainability governance. The findings follow the generally agreed idea of unique control packages in project control, but show the unique configuration of the control package in line with the project's sustainability goals. Where project control literature typically focuses on intra-organizational control or dyadic control relationships, the findings highlight the central role of external control — i.e. need for sustainability governance.