P3O is the guidance published by the UK Government Office of Government Commerce (more from these guys what would we do without these super-organised Pomes?), to help organisations implement Portfolio, Programme and Project Management Offices (P3O).
The P3O manual states 'P3O provides universally applicable guidance that will enable individuals and organisations to establish, develop and maintain appropriate business-support structures'. The P3O manual has supporting accreditation standards in place for foundation and practitioners that can be met via an examination accreditations that Asq holds.
As you would expect, the guidance aligns itself to other OGC guidance such as, PRINCE2, Managing Successful Programmes (MSP), and also Management of Portfolios (MoP).