26. Recalling its request at the previous session, GRSG noted the availability of ISO STD 11439:2013 and ISO 6722 (GRSG-107-28) with a condition of limited use by GRSG experts. The expert from NGV Global introduced the terms of references (ToR) for the proposed IWG to revise the provisions of the UN Regulation (GRSG-107-02), including the harmonization of provisions related to private standards. The expert from Germany suggested that the proposed ToR needed improvement and added that he did not support the establishment of an IWG that would revise the UN Regulation without a clear description of tasks. The expert from France made similar comments and raised concerns on the availability of ISO standards. The Chair of GRSG suggested the possible solution of reproducing the part concerned with ISO STD 11439:2013 into Annex 3 of the UN Regulation rather than to reference it. GRSG agreed to resume discussion at its May 2015 session on the basis of a revised proposal tabled by the expert from NGV Global. Interested experts were invited to contact the expert from NGV to complete the revised draft ToR.