36. The expert from France introduced GRSP-61-17-Rev.2, superseding ECE/TRANS/WP.29/GRSP/2017/17 aimed at introducing the third phase of the UN Regulation which is meant to introduce “Universal belted” and “Specific vehicle belted” category of CRS. He further explained that the basic principle of Phase 3 was to reach a compromise from misuse and bad installation and having as much as possible seat places to install CRS where ISOFIX anchorages cannot be allocated. Moreover, GRSP noted the request of guidance to Contracting Parties proposed in GRSP-61-28 concerning: (i) which kind of combinations of ECRS should be allowed (e.g. ISOFIX and Universal Belted) (ii) under which conditions and (iii) guiding principles. The expert from the Netherlands raised concerns on “inserts” used on CRS to adapt them to the size of the occupant. He stated that inserts should be identified (labelled with identification and with size information) and that requirements should be devised to prevent camouflage of bad CRS. The expert from the United Kingdom supported the principle of a performance-based approach and requested more data on misuse. However, he shared the concern of the expert from the Netherlands. The expert from IC stated that ISOFIX had the priority to avoid misuse while other solutions and combinations with ISOFIX were just secondary and should be limited. The experts from Germany and Sweden raised a study reservation and stated that “plug-and-play” solution was the key principle for having a simple and efficient system; while now the ECRS IWG was opening to combinations that could have misuse implications.