According to the Capability in Business Analysis™ (CCBA®) guidelines, a traceability matrix is a technique that helps the business analyst to understand the relationships and dependencies among the requirements, and to track the changes and impacts of the requirements throughout the project lifecycle12. A traceability matrix can assist the BA in better understanding the related requirements when one of the IT systems will take longer than anticipated to implement, as it can show how the delay will affect the other solution requirements and the stakeholder requirement.
References: The CCBA® learning documents, which can be found on the IIBA website12, describe the various techniques that a business analyst can use to manage and maintain the requirements, including the traceability matrix. Additionally, the IIBA Bookstore offers resources that provide further insights into the objectives and best practices for business analysis, including the use of traceability matrix34.