To facilitate compliance with Securities and Exchange Commission Regulation Systems Compliance and Integrity (Regulation SCI), the MSRB adopted Rule A-18 on Mandatory Participation in Business Continuity and Disaster Recovery Testing on November 2, 2015. Pursuant to Section (b) of Rule A-18, the MSRB is notifying MSRB-registered entities of the criteria for designating participants for the MSRB’s next mandatory functional and performance testing of the operation of its business continuity and disaster recovery plans.