5. In the same time, the expert from Japan introduced the eighth status report of the Informal Working Group (IWG) on Head Restraints. The expert from OICA suggested that both UN GTR No. 7 and UN Regulation No. 17 be kept aligned. However, he added that if, at this time, it was difficult to maintain alignment, he urged GRSP to at least amend UN Regulation No. 17 to include the outcome of the IWG work. The expert from CLEPA introduced GRSP-64-44, expressing concerns on repeatability and reproducibility of BioRID test results and suggesting permissible variations to the injury criteria. GRSP noted that a proposal for amendments to Mutual Resolution No. 1 (M.R.1), which incorporated drawings and specifications of the BioRID dummy would possibly be presented at the May 2019 session of GRSP.

16. The experts from Japan and EC introduced GRSP-64-37 on the proposal of amendments (ECE/TRANS/WP.29/GRSP/2018/34) to UN Regulation No. 17 (Strength of seats) that would align it with Phase 2 of UN GTR No. 7 (see para. 5 above). The expert from CLEPA introduced GRSP-64-25, to clarify static alternative provisions of UN GTR No. 7, Phase 2 and modifications to the allowed range of tolerances to backset retention and to the energy dissipation test. GRSP agreed to hand over GRSP-64-25 to the IWG for its possible integration in the proposal of amendments to UN Regulation No. 17 and to the draft amendment to UN GTR No. 7. GRSP agreed to resume discussion on this subject at its May 2019 session on the basis of the progress of the IWG work.