What is a Project Management Information System (PMIS)?
The PMIS is the integrated tool environment the project runs on: scheduling software, cost tracking, document management, risk logs, dashboards, and the workflows connecting them. PMBOK treats it as part of the environment — it's how work gets planned, tracked, and reported day-to-day.
The quiet governance point: the PMIS is the single source of truth. When the schedule lives in one tool, costs in another, and reality in someone's private spreadsheet, the project has three truths, which is zero.
Worked example
A hospital-build program runs its PMIS stack: Primavera for schedule, a cost system fed weekly from site, a common document environment for drawings (with revision control), and a dashboard the owner sees. When a subcontractor works from a superseded drawing, the document log shows exactly who downloaded what and when — the PMIS turning a blame war into a lookup.