Business use cases are the documents that the business analyst should pay the most attention to ensure the project succeeds this time. Business use cases are documents that describe the interactions between the users and the system, and the value or benefit that the users obtain from the system. Business use cases can help the business analyst and the project team to understand the business needs, goals, and expectations of the stakeholders, and to define the scope, functionality, and behavior of the system. Business use cases can also help to verify and validate that the system meets the requirements and delivers the desired outcomes.
References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline1, page 18; Business Analysis for Practitioners: A Practice Guide2, page 93.