The BA should assess the impact of the forthcoming legislation immediately when it is logged in the action items register. This is because assessing the impact of a change is a technique that involves analyzing how a change affects the existing or proposed solution, business processes, stakeholders, or organization. Assessing the impact of the forthcoming legislation immediately can help the BA to identify and mitigate any potential risks or issues that might have an impact on the proposed architecture and plan accordingly. The other options are not as urgent or appropriate as assessing the impact immediately. References: BABOK Guide, section 10.16: Impact Analysis CCBA Practice Test, question 115