54. GRSP noted that a number of new activities, particularly under the 1998 Agreement, should be revised by his experts to keep acronyms consistent in present and future GRSP work. Furthermore, the expert from EC mentioned that currently in UN Regulations, terminology (likely with the same meaning) concerning head injury needed clarifications: Head Acceptance Criterion (HAC) (UN Regulation No. 80), Head Injury Criterion (HIC) and Head Performance Criteria (HPC). GRSP agreed to resume discussion on this subject at its December 2019 session.