Just to add to your discussion, a business case provides the following elements for the intended value contribution, which are Business need, Project Justification, and Business Strategy. Business need: Business provide the rationale for the project, explaining why the project is undertaken, It orginates with the preliminary business requirements, which are reflected in the project charter or other authorizing document. It provides details about the business goals and objectives project justification: It explains why the business need is worth the investment and why it should be addressed at this time. business strategy: the reason for the project and all needs are related to the strategy to achieve the value