The Organization Portfolio Office (OPO) is a single permanent office designed to provide strategic planning and portfolio support, as per the P3O® Foundation (2013) manual. Section 5.3.2 states, "The Organization Portfolio Office is a centralized, permanent entity that delivers strategic planning, portfolio prioritization, and oversight across the organization." This contrasts with Hub Portfolio Offices (A), which are decentralized with local support, Virtual Offices (C), which are temporary and flexible, and Flexible Resource Pools (D), which focus on resource allocation rather than strategic functions. The 2013 edition highlights the OPO’s role in aligning the entire change portfolio with organizational strategy, making it the correct model for this purpose. This centralized approach ensures consistent governance and decision-making.