Road vehicles -- Methods and criteria for usability evaluation of child restraint systems and their interface with vehicle anchorage systems

ISO 29061-4:2017 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. ISO 29061-4:2017 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. ISO 29061-4:2017 can be used in conjunction with either ISO 29061-1 or ISO 29061-3 for making a complete usability evaluation of child restraint systems attached to the vehicle with ISOFIX/LATCH or vehicle seat belts. NOTE Booster system usability evaluation, including securing of a child in the booster system, is covered by ISO 29061-5.

Véhicules routiers -- Méthodes et critères pour l'évaluation de la facilité d'utilisation des systèmes de retenue enfants et leurs interfaces avec les systèmes d'ancrage dans le véhicule

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Status
Published
Publication Date
30-Nov-2017
Current Stage
9092 - International Standard to be revised
Start Date
27-May-2021
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ISO 29061-4:2017 - Road vehicles -- Methods and criteria for usability evaluation of child restraint systems and their interface with vehicle anchorage systems
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INTERNATIONAL ISO
STANDARD 29061-4
First edition
2017-12
Road vehicles — Methods and criteria
for usability evaluation of child
restraint systems and their interface
with vehicle anchorage systems —
Part 4:
Securing of child in child restraint
system and daily handling aspects
Véhicules routiers — Méthodes et critères pour l'évaluation de la
facilité d'utilisation des systèmes de retenue enfants et leurs interfaces
avec les systèmes d'ancrage dans le véhicule —
Partie 4: Sécuriser l'enfant dans les systèmes de retenue pour enfant,
et aspects de manipulation quotidienne
Reference number
ISO 29061-4:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 29061-4:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2017 – All rights reserved
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ISO 29061-4:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Usability evaluation procedure and scoring principles .............................................................................................. 2

4.1 Evaluation procedure ........................................................................................................................................................................ 2

4.2 Scoring system ........................................................................................................................................................................................ 3

5 Usability evaluation forms ......................................................................................................................................................................... 3

Annex A (informative) Recommendations regarding scoring and assessment ....................................................13

Annex B (informative) Example usability rating classes ..............................................................................................................14

Bibliography .............................................................................................................................................................................................................................15

© ISO 2017 – All rights reserved iii
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ISO 29061-4:2017(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 36,

Safety and impact testing.
A list of all parts in the ISO 29061 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved
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ISO 29061-4:2017(E)
Introduction
The usability of a child restraint system (CRS) in terms of ease of:
— installation of child restraint systems in various vehicles; and

— day-to-day use with a child (e.g. securing, harnessing, adaption for a growing child, etc.)

is of utmost importance to ensure that a child restraint system is used properly in accordance with the

manufacturer's intentions, and to ensure that it will provide maximum protection in a crash situation.

An international agreement on usability criteria and measurements is beneficial for both consumers

and manufacturers.

The aim of this document is to develop and validate a usability evaluation system for installation of

child restraint systems with vehicle seat belts to promote improved design for an easy and correct use.

It provides child restraint and vehicle manufacturers with a tool for the assessment of the usability

of new and current systems. At the same time, it provides consumers (parents and caregivers) with

usability information on the key features related to the proper use of the attachment system, and assist

them in selecting child restraints and vehicles that are easy to use properly.

The ISO usability evaluation system has been developed with participation from, and considering the

experiences from, usability rating systems of Canada (Transport Canada and ICBC), USA (NHTSA), EU

(NPACS and consumer rating programmes, such as ICRT, ADAC).
© ISO 2017 – All rights reserved v
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INTERNATIONAL STANDARD ISO 29061-4:2017(E)
Road vehicles — Methods and criteria for usability
evaluation of child restraint systems and their interface
with vehicle anchorage systems —
Part 4:
Securing of child in child restraint system and daily
handling aspects
1 Scope

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.
The 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 child restraint systems attached to the vehicle with ISOFIX/LATCH or vehicle

seat belts.

NOTE Booster system usability evaluation, including securing of a child in the booster system, is covered by

ISO 29061-5.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 29061-1, Road vehicles — Methods and criteria for usability evaluation of child restraint systems and

their interface with vehicle anchorage systems — Part 1: Vehicles and child restraint systems equipped with

ISOFIX anchorages and attachments

ISO 29061-3, Road vehicles — Methods and criteria for usability evaluation of child restraint systems and

their interface with vehicle anchorage systems — Part 3: Installation of child restraint systems using vehicle

seat belts
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
© ISO 2017 – All rights reserved 1
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ISO 29061-4:2017(E)
3.1
audible
capable of being heard in normal environmental conditions
3.2
child restraint system
CRS

free-standing device intended to provide child vehicle occupants with an approved restraint

Note 1 to entry: CRSs comprise various categories such as car beds, infant restraints, toddler seats (forward and

rearward-facing), booster cushions, and booster seats. Combination products may cover two or more of these

product categories.
3.3
support leg

anti-rotational device comprising a permanent attachment to a child restraint system (3.2), or a base

of a child restraint system, creating a compressive load path between the child restraint and a vehicle

structure (for example, the vehicle floor) to prevent or reduce forward rotation of the child restraint

Note 1 to entry: A support leg may be adjustable.
3.4
top tether

tether strap attached at or near the top of a CRS (3.2), incorporating a device to enable it to be connected

to a vehicle top tether anchorage (3.4.1)
3.4.1
top tether anchorage

device, such as a ring, bar, bracket, or webbing loop, and its underlying structure, either user-ready or

aftermarket-installed, to which a top tether (3.4) can be attached
3.4.2
top tether strap

webbing strap which extends from the top of a CRS (3.2) to the top tether anchorage and which is

equipped with an adjustment device, a tension-relieving device and a top tether connector

3.5
usability

extent to which a product can be used by specified users to achieve specified goals with effectiveness,

efficiency and satisfaction in a specified context of use

Note 1 to entry: Interpretation of the generic definition for the purpose of this document: the extent to which

a CRS (3.2) is capable of being used and is convenient and practical in use (separately or in combination with a

vehicle).

[SOURCE: ISO 9241-11:1998, 3.1, modified — a new Note 1 to entry has been added.]

4 Usability evaluation procedure and scoring principles
4.1 Evaluation procedure

This document provides a procedure to evaluate the usability related to the securing of child in

child restraints, and other daily handling aspects. It shall be used in conjunction with ISO 29061-1 or

ISO 29061-3 for a complete usability evaluation of child restraint systems attached to the vehicle with

ISOFIX/LATCH or vehicle seat belts.

The procedure evaluates ease of availability of instruction, clarity of instruction manual and labelling,

and the ease of use of design-related features of the CRS related to the securing of child in the CRS and

daily handling aspects.
2 © ISO 2017 – All rights reserved
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ISO 29061-4:2017(E)
The assessment is done in two steps:
— a separate assessment of the child restraint system; and

— a usability assessment when securing a child or child dummy, with the CRS installed in a vehicle, or

in a simulated vehicle setup.
The usability protocol is intended to be objective and repeatable.

The evaluation is most easily accomplished using a team of two people having basic knowledge of child

restraints and being familiar with the technical terms used. The procedure for all aspects of the process

takes about 30 min.
The materials necessary include:
— the usability evaluation form (in either paper or electronic format);
— the child restraint manual, including the instruction video if applicable; and
— a screwdriver, or a simple prying/turning tool.
A copy of the terms and definitions from this document may also be helpful.

Initially, the child restraint should be in the condition as supplied to the consumer. The evaluation

process includes all the steps, including assembly, to complete the installation. The process should

preferably be carried out by a person unfamiliar with the CRS and vehicle.

Unpacking the CRS, removing the box and plastic protections, detaching the handbook, etc., should be

disregarded in the evaluation, but other initial one-time preparations are considered and assessed in

the forms.

The mode of use for the child restraint and the seating position in the vehicle should be determined in

advance and documented in the evaluation form.

The evaluation process first addresses the labels and instructions, followed by the ease of positioning

and securing the child or the child dummy in the CRS, in a vehicle environment.
4.2 Scoring system

The scoring system consists of a Good/Average/Poor rating (scored with 3/1/0 points) of each

item assessed, and an importance rating A/B/C (scored with 3/2/1 points) for each item. For each

assessment, the scoring of the above are multiplied. A maximum score for a "Good" solution on an item

with "A" importance is 9 points.
In this d
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