This document provides criteria for judgement of usability of child restraint systems (CRSs) with ISOFIX attachments and their corresponding anchorage systems in the vehicle. This document provides criteria for a separate evaluation of the CRS ISOFIX attachments, of the ISOFIX anchorage installation in the vehicle, and an evaluation of the interface issues when installing a CRS in a certain vehicle.

This document covers both rigid and flexible attachments of the CRS to the vehicle ISOFIX anchorages.

NOTE 1 CRS includes enhanced child restraint system (ECRS) according to UN Regulation No. 129.

NOTE 2 Although ISOFIX is defined in the original "ISOFIX" standard (ISO 13216-1) to be a rigid system, the term "ISOFIX" in this document is extended to include flexible CRS attachments (e.g LATCH in USA, UAS in Canada).