Which technique is used for dividing and subdividing the project scope and deliverables into smaller, manageable parts?

Decomposition is a key technique in project management used to break down the project scope and deliverables into smaller, more manageable components. This process allows project managers to define the work required more clearly and ensures that all aspects of the project are accounted for. By subdividing larger deliverables or project phases into smaller tasks, it becomes easier to estimate resources, assign responsibilities, and monitor progress effectively.

This method is crucial because it helps to create a structured work breakdown structure (WBS) that serves as a foundation for project planning, scheduling, and cost management. Decomposition ensures that project teams understand their tasks clearly and helps to identify dependencies and potential risks at a granular level, which enhances the overall management of the project.

The other options do not specifically refer to the practice defined in this context; for instance, segmentation and fragmentation may refer to dividing things but do not capture the formal methodology of scope management in project management. Partitioning could suggest dividing a system but lacks the structured approach inherent in decomposition. Thus, decomposition remains the most appropriate and widely accepted technique for this purpose.