The preliminary scope statement must be completed because it defines the expected deliverables, boundaries, assumptions, constraints, and high-level work needed for the project. During planning, the project manager reviews deliverables to ensure the scope is complete enough to support more detailed planning, including the work breakdown structure, schedule, budget, quality expectations, and resource needs. Project objectives are important, but they are usually established earlier during initiation and provide the reason for the project rather than a detailed description of deliverables. Access requirements may be needed for implementation or operations, but they do not validate deliverable completeness. A QA plan defines how quality will be managed and verified, but it depends on the scope and deliverables being clearly understood first.