The Organization Portfolio Office is a P3O model defined as a single, permanent office established at the corporate level. Its primary purpose is to support senior management's decision-making on strategic matters and to manage the organization's investment portfolio. This model provides a centralized overview of all change initiatives, ensuring they are aligned with strategic objectives and that portfolio-level support, such as strategic planning and dependency management, is consistently applied across the organization.

A. P3O model with Hub Portfolio Offices: This is not a single office model; it consists of a central hub office and multiple satellite (spoke) offices.

C. Virtual Office: This model is not a permanent, physical office but rather a decentralized structure where P3O functions are performed by individuals across the business.

D. Flexible resource pool: This is a function or service that a P3O may provide (managing skilled resources), not a structural P3O model itself.

AXELOS. (2013). Portfolio

Programme and Project Offices (P3O). The Stationery Office.

Section 3.3.1

Organization Portfolio Office: "An Organization Portfolio Office is a single permanent office set up to support senior management to make strategic decisions..." (p. 26).

Section 3.3.2

Hub Portfolio Offices: Describes this model as a central hub with several permanent or temporary spoke P3Os (p. 27).

Section 3.3.3

Virtual P3O: "A virtual P3O model is not a physical office..." (p. 28).

Section 2.3.2

Centre of Excellence Functions: Lists 'Developing and managing a flexible resource pool' as a potential P3O function

not a model (p. 18).