Explanation
According to the BABOK Guide, a plan-driven approach is an approach that plans upfront with maximum control of what the expected implementation would be. The waterfall project methodology supports a predictive approach in planning. In this approach, the business analyst defines the requirements at a high level and then seeks formal approval from the stakeholders before proceeding to the next phase of the project. This ensures that the scope and objectives of the project are clear and agreed upon by all parties involved. The initial requirements are also known as the business requirements or the scope statement. They provide a broad overview of the problem or opportunity, the desired outcomes, the assumptions, constraints, and risks. The initial requirements are usually documented in a business case, a project charter, or a statement of work. The initial requirements must be formally approved by the stakeholders before the business analyst can begin capturing and defining the requirements at a deeper level of detail, such as the stakeholder, functional, non-functional, transition, and quality requirements. These detailed requirements are usually documented in a requirements specification, a use case model, a data model, a process model, or other artifacts. The detailed requirements must also be validated and verified by the stakeholders before they can be implemented by the solution team. References:
BABOK Guide, section 3.1 Plan Business Analysis Approach, page 38-40
How to Choose the Right Business Analysis Approach, section Waterfall Approach, page 1-2 Defining the Business Analysis Approach in 2023, section What is a Business Analysis Approach?, page 1