112. The representative of the United Kingdom (Chair of AC.3), gave a status report of the work of the IWG. He informed AC.3 that the IWG was pursuing a more empirical approach to determine biomechanical criteria and that alternative approaches were under study. He reported that the IWG expected a more advanced proposal in the May 2016 session of GRSP on UN GTR No. 7 and of Addendum 1 to Mutual Resolution No. 1 (M.R.1) to incorporate Biofidelic Rear Impact Dummy (BioRID) specifications. He concluded that however an extension of the mandate of the IWG until March 2017 was needed to complete the above-mentioned final proposals. AC.3 endorsed this request.