A PMO brings accountability, visibility, and discipline to projects. The document discusses two case studies where PMOs provided value. For the University of Plymouth's migration to Microsoft Azure, the PMO acted as a buffer between teams and stakeholders and ensured agile practices were not ad-hoc. For Ornua's global transformation, the PMO was key in communicating across boundaries and using dashboards to maintain visibility and prevent issues from falling through cracks. Lessons focused on how organizational, people, and value factors influence a PMO's ability to provide value.