Phase 2 of GTR No. includes proposals for injury assessment reference values (IARV). The United States has asserted that the IARV have not been sufficiently validated through cost-benefit analysis, which is a requirement in US rulemaking. Therefore, the US has proposed to permit regulators to select IARV that correspond to their local vehicle populations. However, adding this qualification (through a footnote) would create a precedent for future GTR and OICA has lamented that such diversity in application hampers the goal of harmonization. Therefore, the GTR 9 informal group and GRSP are putting this issue before the World Forum for guidance.