The Project Management Body of Knowledge (PMBOK) notes that repetitive elements may be present in some project deliverables, but this repetition does not change the fundamental, uniqueness of the project. See also product, service, and result.

The Work Breakdown Structure is structured by the project deliverables, with the major deliverables broken down into Work Packages.

Deliverables can be categorized into those that are internal and those that are external. Internal deliverables are required to deliver the project, while the external deliverables are typically delivered to the end users or customer. The term is often used more narrowly in reference to an external deliverable, which are usually subject to approval by the project sponsor or customer.