5. The expert from the Republic of Korea introduced GRSP-70-19, which is the progress report of IWG-DPPS. He explained that the IWG Phase 1 would include numerical simulation for head impact time (HIT) against the vehicle in case of deployable systems and a marker in the preamble for generic approach to be developed in the next phase. He also informed that the expert from Japan had proposed a sentence about an equivalent method (physical or alternative numerical simulation) to the numerical simulation to be agreed by Contracting Parties. GRSP, agreed, that the request by Japan to allow optional alternatives could be temporarily resolved by including the statement in the preamble (Part A) in brackets. This would give contracting parties further time for consideration and a final decision on removing the brackets could be made when the draft amendment would be reviewed at the May 2022 session of GRSP. Moreover, GRSP agreed that the IWG-DPPS should finish its work under the current mandate given by AC.3 without becoming occupied by other important but at this point irrelevant issues and distracted with side discussions.