Explanation/Reference: https://www.pmi.org/learning/library/top-five-causes-scope-creep-6675

A configuration management system is a tool that can be used to trace the large number of requirements that will be generated by this project. A configuration management system is a system that consists of the processes, procedures, tools, and databases that are used to manage and control the configuration items of the project. A configuration item is any component of the project that has a defined and approved version, such as a requirement, a deliverable, a document, a model, a test case, etc. A configuration management system can help the business analyst and the project team to record, track, update, and maintain the configuration items throughout the project lifecycle, and to ensure their consistency, integrity, and traceability. A configuration management system can also help to handle changes, resolve issues, and measure the quality and performance of the project. References: PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline1, page 24; Business Analysis for Practitioners: A Practice Guide2, page 133.

Explanation
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 be used as a source for building tests of end-to-end business processes across business functions and systems, as it provides a comprehensive and realistic view of the expected behavior and outcomes of the solution. A use case can also help to 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.