In December 2023, the Joint TRANSSC/RASSC Working Group on the Proposed Revision of A₁/A₂ Values was established with the overarching objective of fostering cooperation, coordination, and a mutual understanding between the members of TRANSSC and RASSC regarding the proposed correction of the A₁/A₂ values as part of the ongoing revision cycle of SSR-6 (Rev. 1).  Its findings were presented at the joint NSGC/RASSC/TRANSSC meeting on 12 June 2024. In their separate Review Committee meetings following this joint meeting, RASSC and TRANSSC supported the establishment of a new joint Working Group to examine whether the correction of the A₁/A₂ values is justified in terms of potential impacts it may have in Member States. After discussions between the RASSC and TRANSSC Secretariats, it was mutually agreed that, before deciding on the establishment of a new joint Working Group, this document (a justification paper), which outlines the issues to be considered in deciding whether the incorporation of the corrected A₁/A₂ values into SSR-6 (Rev. 2) is justified, would be prepared and submitted to the Review Committees to aid them in their deliberations on this matter at their next respective meetings.