By 2020, it is estimated that global construction output will have grown by 70% to $12.7 trillion and will account for 14.6% of world output. Construction in emerging markets will grow by 110% to become a $7 trillion market. The CoST pilot study demonstrated that the efficiency of this market can be improved, to the benefit of developing countries. To achieve this, CoST focuses on the role of procuring entities and ensures that they are accountable for public expenditure on construction. It does not impose additional burdens on business, but rather offers potential benefits. The pilot demonstrated that the involvement of the sector in the multi-stakeholder groups in participating countries.is vital to the success of the initiative. It is clear that the support and involvement of the private sector at the international level is equally important. This briefing note examines both aspects.