"Project Portfolio Management" names a portfolio of applications split across two offerings that solve different problems for different people. TREATING IT AS ONE PRODUCT IS THE MOST COMMON SCOPING ERROR IN THIS DOMAIN.
Project Financial Management. Planning, organizing and managing activities, resources, cost, billing and revenue so projects complete successfully and the numbers are right. Bought by Finance. The centre of gravity is the general ledger.
Project Execution Management. Planning and delivering projects, collaborating on project and non-project work, and finding the best-fit resource to staff an assignment. Bought by the PMO and delivery leadership. The centre of gravity is the schedule and the people.
PFM does costing, billing, revenue, budgets, forecasts, performance reporting. PEM does project and task management, scheduling, resource pools, utilization and staffing.
What they share: projects, tasks, resources and roles as concepts. But each offering uses them somewhat differently — and that is the second-most-common source of confusion in this domain. The same four words, two meanings, and nobody notices until two people describe the same object and disagree.
The customer profiles. A professional services firm billing clients by the hour → PFM, almost certainly with contracts. An internal IT department tracking project spend → PFM without billing. An engineering firm with capital projects → PFM with capitalization. A PMO that wants to schedule work and staff it → PEM. A consultancy doing all of it → both — and that is a bigger implementation than either alone.
Here is what this lesson is worth, in the two forms it takes. A client says "we want to manage projects." You scope PEM. Three months in, Finance asks where the invoices are. Or the reverse: you scope PFM, and the delivery team discovers there is no scheduling. Both happen. Both are avoidable in a twenty-minute conversation — which is Lesson 4.
And one name to recognise rather than learn: Grants Management is an adjacent offering for organizations with awards and funding.