27. GRB resumed consideration of definitions and acronyms in UN Regulations and UN Global Technical Regulations under the responsibility of GRB on the basis of GRB-57-12 and GRB-57-18. The Chair of GRB stressed the importance of preparing a full and consistent list of acronyms and abbreviations with a view to avoiding any ambiguity in this area. It was agreed that this list covering both the 1958 and 1998 Agreements would then be submitted to WP.29 for approval and would be updated from time to time. GRB reiterated its invitation to all experts to provide their contributions, if any, so that the final document could be approved at the September 2014 session of GRB.