Abstract
This chapter considers the governance interface between the owner organization and the temporary delivery organization. It explains that the governance interface is about how the owner ensures that what they get at the end of the project as output is as close as feasible to what they expected from the project mission. Moreover, governing the interface is essential because the owner and its stakeholders must be assured that the investment project is on track for delivery. The chapter looks into the structure of contemporary project governance, which involves the stage-gate process for governing delivery through the life cycle and the portfolio management process. The chapter notes how the project management office operates as the controller, supporter, and developer of project governance.