ISO 29061-4:2026

This document provides criteria for judgement of usability of child restraint systems (CRS) with regard to the securing of a child in the child seat and other daily handling aspects. This document provides criteria for judgement of: ease of availability of instructions; clarity of instruction manual and labelling; and the ease of use of design related features of the CRS related to securing the child or child dummy in a CRS installed in vehicle. This document can be used in conjunction with either ISO 29061-1 or ISO 29061-3 for making a complete usability evaluation of CRSs attached to the vehicle with ISOFIX/LATCH or vehicle seat belts. NOTE 1 CRS includes enhanced child restraint systems (ECRS) according to UN Regulation No. 129. NOTE 2 Booster system usability evaluation, including securing of a child in the booster system, is covered by ISO 29061-5.