The agenda covers the 13th session of the Informal Group for Real Driving Additional Sound Emission Provisions, held June 10-12, 2026, in Gothenburg, Sweden. Topics include RD-ASEP Terms of Reference from GRBP 78th Session (GRBP-78-13), R51 matters including procedural update (GRB-68-03), Analysis Task Force Report, Editing Task Force Report, R51.04 Issues List Review, draft R51.04 text review, Inside Boundary Condition discussion, and Outside Boundary Condition discussion. The next meeting is scheduled for August 31–September 1 in Geneva, Switzerland.