IFC - Industry Foundation Classes/IFC concepts/IFC sequence concepts

Processes are individual events or tasks. Processes may have different meanings when used in different scenarios. When processes are used in construction, they represent construction tasks which have associated sequence relationships, may transform inputs into outputs, and have relationships to costs, products, and resources. When processes are used in facility management, they represent maintenance tasks, including to-do lists and recurring patterns.

A project has plans related to construction and facility management

Work plans group work schedules, typically either for construction management purposes or for facility management purposes.