The main purpose of the Business Case is to justify the need for the project and to obtain funding and support for it. The main purpose of the Benefits Management Plan is to ensure that the benefits of the project are realized.
The Business Case typically includes an executive summary, an overview of the business problem or opportunity, an analysis of the costs and benefits of the project, an assessment of the risks and opportunities, and a recommendation to proceed or not. The Benefits Management Plan typically includes a description of the benefits to be realized, a benefits map, a benefits realization plan, a benefits tracking plan, and a benefits management and governance plan.
The Business Case is typically prepared by the project sponsor or the business owner. The Benefits Management Plan is typically prepared by the project manager or the benefits manager.
The Business Case is typically prepared at the beginning of the project, before any work has been done. The Benefits Management Plan is typically prepared during the planning phase of the project, after the Business Case has been approved.
The Business Case is typically presented to senior management, stakeholders, and funding bodies. The Benefits Management Plan is typically presented to the project team, the benefits owner, and the stakeholders.