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.