Around the world, there are many organizations in both the public and private sectors, who recognise that their portfolio, programme and project management is best supported through a delivery support office. The Cabinet Office's PRINCE2®, Managing Successful Programmes (MSP®), and Management of Risk (M_o_R®) all touch on the need to provide adequate support structures for these best practices, but until now there has been no single source of information that either organizations or individuals can use for guidance or advice on setting up or running an effective delivery support office. Portfolio, Programme and Project Offices (P3O®) is a Best Management Practice certification and is aligned to PRINCE2®, MSP®, and M_o_R®. P3O® brings together in one place a set of principles, processes and techniques to facilitate effective portfolio, programme and project management through enablement, challenge and support structures. P3O® is a Registered Trade Mark of Axelos.