A P3O® model provides a decision enabling/delivery support structure for all change within an organisation. This may be provided through a single permanent office which may exist under several different names, for example Portfolio Office, Centre of Excellence, Corporate Programme Office. It may otherwise be provided through a linked set of offices (portfolio office, programme offices, project offices). These offices could be permanent and temporary, providing a mix of central and localised services. Whatever the structure, a P3O® is essential for ensuring successful outcomes through the delivery of portfolios, programmes and projects.