Project scope management includes processes for defining and controlling what work needs to be done to deliver the project, beginning with developing a scope management plan, collecting requirements, and creating a detailed project scope statement that outlines the deliverables, exclusions, assumptions and acceptance criteria. It also involves breaking the work down into a work breakdown structure and validating that the project scope accurately reflects stakeholder needs through requirements traceability and change control. Effective scope management is crucial for project success by ensuring the project includes all necessary work and only the work required to complete the project.