Board structures and procedures vary both within and among countries. Some countries have two-tier boards that separate the supervisory function and the management function into different bodies. Such systems typically have a “supervisory board” composed of non-executive board members and a “management board” composed entirely of executives. Other countries have “unitary” boards, which bring together executive and non-executive board members. In some countries there is also an additional statutory body for audit purposes. The Principles are intended to apply to whatever board structure is charged with the functions of governing the enterprise and monitoring management.