For a large, complex project with many specialized tasks, the most effective organizing mechanism is a Work Breakdown Structure (WBS). The WBS decomposes project deliverables into smaller, manageable components (work packages), creating a structured view of "all the work required" to complete the project scope. This enables assignment of responsibility (e.g., via a responsibility assignment matrix), better estimating, clearer tracking, and tighter control. Work packages become the foundation for developing the activity list and schedule, estimating costs, planning quality, and managing procurement and risks. Sending a task list to a sponsor is not a planning strategy and does not provide a scope-based hierarchy. Eliminating tasks with stakeholders may be helpful only after scope is defined and validated; it doesn't organize work. A resource management plan supports how resources are acquired and managed, but it does not break down deliverables into monitorable units of work. The WBS is the central scope artifact that turns complexity into a controllable structure and supports execution, monitoring, and reporting.