In the Philippines, corruption in construction and infrastructure is broadly recognised to be high, and the CoST pilot benefited from a strong civil society push for transparency. For the Multi Stakeholder Group that directed the Philippines CoST pilot, the challenge has been to coordinate elements of existing transparency initiatives into an integrated and cohesive effort that can ensure the transparency of material project information throughout the entire cycle of a public sector construction project. This note documents how the pilot was established and implemented and how it has sought to make CoST sustainable by working within existing government structures.