46. The secretariat presented WP.29-164-26 and indicated that following the discussions at WP.29 (ECE/TRANS/WP.29/1108, para. 39), the WP.29 Secretary proposed listing best practices on the use of private standards in UN Regulations, UN Rules and UN GTRs managed by WP.29. He recalled the different manners used by the GRs to reference standards (incorporation by reference, partial or full reproduction). He reported on the ISO cooperation with GRSG to access and review two standards during the 107th GRSG session. He outlined the methods of cooperation between GRs with standards developing organizations and how information is received about the content of standards, as well as answering questions raised by the experts. He concluded that these best practices could be extended to all GRs, if needed. The Chairs of GRPE and GRRF announced that they would bring this document to the attention of both GRs.