A use case is a technique that describes how an actor interacts with a system to achieve a goal or perform a task. A use case consists of a main scenario and possible alternative scenarios that capture the normal, exceptional, and error flows of events. A use case can also include the acceptance criteria that specify the conditions that must be met for the use case to be successfully completed and accepted by the stakeholders.
The test team can review the use cases to help identify the acceptance criteria for the solution, as they provide a comprehensive and realistic view of the expected behavior and outcomes of the system. The test team can also use the use cases to design and execute test cases that verify and validate the functional requirements and acceptance criteria of the solution. References: PMI Professional in Business Analysis (PMI-PBA) Examination Content Outline1, page 20; Business Analysis for Practitioners: A Practice Guide2, page 99.