A stakeholder requests to add new critical requirements the day before the scheduled baseline requirements...

 According to the PMI Guide to Business Analysis, one of the best practices for managing changes to requirements is to communicate them to all relevant stakeholders and solicit their feedback before approving or rejecting the change request. This ensures that the impact of the change is understood and agreed upon by all parties, and that the change does not introduce any conflicts or inconsistencies with the existing requirements. By sharing the new requirements with all stakeholders and asking them to submit their comments before the meeting, the business analyst can facilitate a constructive discussion and reach a consensus on how to proceed with the change request. References: PMI Guide to Business Analysis, page 287-288.