Requirements architecture is the tool that can be used by the BA to assess the impact of the change of developing an additional product as part of the project. Requirements architecture is the structure of requirements that defines their scope, boundaries, relationships, dependencies, assumptions, constraints, prioritization, traceability, and quality. Requirements architecture can help to assess the impact of change by identifying how a change in one requirement affects other requirements or solution components. References: : BABOK Guide v3, Section 7.1 : BABOK Guide v3, Section 7.1.2