
Professional project management roles can be separated in two sides:

- Demand Management: People who propose projects and monitor performance.
- Supply Management: People who use human and material resources to execute projects.
This classification is taken from supply chain management. It helps to understand how the different players collaborate throughout the project lifecycle.
Firstly, all roles want to optimize resource utilization, assigning them to the most important projects.
Secondly, all players from demand and supply sides need to collaborate during the whole lifecycle.

Project Management stands between Demand and Operations Management. Projects can be divided into sequential phases, each of them managed as a project again, using processes from initiation to closing. In predictive projects, with most requirements clear from the beginning, planning is key. In adaptive or agile projects, final requirements are gradually discovered, continually collaborating with some stakeholders.
There are 11 different roles to collaborate professionally on project management:
Demand Management Roles
Stakeholder (SH): Project Stakeholders are the people who may affect, be affected by, or perceive themselves to be affected by decisions, activities, or outcomes of projects. Stakeholders are on the demand side because they need to monitor project performance to make sure it will meet their expectations.




Supply Management Roles
Portfolio Manager (PfM): Portfolio Managers are the people assigned by the performing organization to establish, balance, monitor, and control portfolio components in order to achieve strategic business objectives. A portfolio refers to a collection of projects, programs and other work that are grouped together –usually to deliver a solution– to facilitate effective management of that work to meet strategic business objectives. Portfolio Managers are on the supply side because they are accountable for strategic plan execution and strategic goals achievement.


