The project manager needs to ensure that the project management approach captures the intent of business documents. There are two important business documents that are interdependent and iteratively developed and maintained throughout the life cycle of the project: Project Business Case Project Benefits Management Plan The below figure shows the relationships between these two documents and the Project CharterLinks to an external site. and Project Management PlanLinks to an external site.. Business Case-1.png Ref: PMBOK 6th Edition List at least four core components that should be included in a business case document