173. The representative of the European Union, on behalf of the Chair of IWG on EVS, UN GTR No. 20, Phase 2 and of GRSP, informed AC.3 on the work progress of the group. He said that IWG had met in Detroit, United States of America, from 23 to 24 January 2019, had been chaired by the representative of the European Union, and had discussed topics such as thermal propagation, water immersion, toxicity and gas management, as well as 3-D vibration. IWG also conducts research on thermal propagation and toxicity to identify the most appropriate initiation methods for thermal propagation and methods for detection of gases. He stated that results had been shared during the IWG meeting, in particular, thermal propagation and that discussions continued on the basis of a white paper on thermal propagation that guides contracting parties on activities to detect appropriate methods. He explained that other main item of discussion concerned field incident data. He stated that other important topics that were still in discussion, included water immersion and vibration of the battery system. IWG members had agreed to continue discussions the next meeting in June 2019 in Tokyo, Japan. He concluded that IWG was on target to complete its work by the expiration of its mandate in 2021.