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

ISO 29061-3:2017 specifies the criteria for judgement of usability of child restraint systems (CRS) when installing them with the vehicle seat belts. ISO 29061-3:2017 provides criteria for judgement of: - ease of availability of instructions; - clarity of instruction manual and labelling; and - ease of use of design related features of the CRS related to the installation in a vehicle. NOTE Booster system usability evaluation 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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Published
Publication Date
30-Nov-2017
Current Stage
9092 - International Standard to be revised
Start Date
27-May-2021
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ISO 29061-3:2017 - 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 29061-3
First edition
2017-12
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
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 3: Installation des systèmes de retenue pour enfant utilisant les
ceintures de sécurité
Reference number
ISO 29061-3:2017(E)
ISO 2017
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ISO 29061-3:2017(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 29061-3:2017(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 .............................................................................................. 3

4.1 Evaluation procedure ........................................................................................................................................................................ 3

4.2 Scoring system ........................................................................................................................................................................................ 4

5 Usability evaluation forms ......................................................................................................................................................................... 4

Annex A (informative) Recommendations regarding scoring and assessment ....................................................17

Annex B (informative) Example usability rating classes ..............................................................................................................18

Bibliography .............................................................................................................................................................................................................................19

© ISO 2017 – All rights reserved iii
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ISO 29061-3:2017(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 29061-3:2017(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 29061-3:2017(E)
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
1 Scope

This document specifies the criteria for judgement of usability of child restraint systems (CRS) when

installing them with the vehicle seat belts.
This document provides criteria for judgement of:
— ease of availability of instructions;
— clarity of instruction manual and labelling; and

— ease of use of design related features of the CRS related to the installation in a vehicle.

NOTE Booster system usability evaluation is covered by ISO 29061-5.
2 Normative references
There are no normative references in this document.
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
3.1
audible
capability 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.
© ISO 2017 – All rights reserved 1
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ISO 29061-3:2017(E)
3.2.1
multiple modes CRS

type of CRS (3.2) that can be used in several modes, for example converting from integral to non-integral

or for use in different orientations
3.3
misuse

any deviation from the intended application and use of a CRS (3.2) that might reduce its protective

performance
3.4
pictogram

illustration or photo used to represent a concept or an operation which can be supplemented by text

3.5
rebound bar

type of anti-rotational device intended to restrict the rearward rotation of a rearward-facing CRS (3.2)

Note 1 to entry: It usually comprises a rigid device that, when in its operational position, rests against the car

seatback.
3.6
rebound tether
lower tether

type of anti-rotational device intended to restrict the rearward rotation of a rearward-facing CRS (3.2)

Note 1 to entry: It usually comprises a tether strap or other hardware attached near the back or base of the CRS

that connects to a rebound tether (lower tether) anchorage. It incorporates a device to enable it to be connected

to such an anchorage.
3.7
rebound tether anchorage
lower tether anchorage

anchorage on the vehicle seat track or on or close to the vehicle floor to which a rebound tether (3.6)

(lower tether) can be attached
3.8
single action
operation that can be completed without the need to undertake a secondary action

EXAMPLE This includes tightening a strap by pulling it without the need to release a locking system; or

attaching to an anchorage without the need to depress the seat cushion.
3.9
slack

unintended looseness of a strap that is likely to affect adversely the performance of the CRS (3.2)

3.10
support leg

type of 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.
3.11
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 top tether anchorage (3.11.1)
2 © ISO 2017 – All rights reserved
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ISO 29061-3:2017(E)
3.11.1
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 (3.11) can be attached
3.11.2
top tether strap

webbing strap which extends from the top of a CRS (3.2) to the top tether anchorage (3.11.1) and which

is equipped with an adjustment device, a tension-relieving device and a top tether (3.11) connector

3.12
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 of child restraint systems, equipped

with integral harness or shield, intended to be installed in the vehicle using the vehicle seat belts. The

procedure evaluates 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 the installation in a vehicle.

The assessment is done in two steps:
— a separate assessment of the child restraint system; and

— a usability assessment when installing the child restraint system in specified vehicle seating

positions.

The evaluation takes into consideration the various modes of installation and conversions between

installation modes. 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. However, they should preferably be

unfamiliar with the CRS model to be evaluated.

The procedure for all three aspects of the process, the child restraint, the vehicle seating position, and

the resulting interface, takes about 45 min.
The materials necessary include:
— the usability evaluation form (in either paper or electronic format);
— the vehicle owner’s manual;
— the child restraint manual, including 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.

© ISO 2017 – All rights reserved 3
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ISO 29061-3:2017(E)

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 (i.e. forward-facing/rearward-facing, upright/reclined, with

base/without base) 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 installation

and removal of the child restraint system.
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 document, “average” means “mid-level” and should not be perceived as a statistical average

between good and poor.

The maximum possible score will depend on the features and usage of the restraint and vehicle.

Different products may have different maximum possible scores, and therefore, comparisons of the raw

number of total points would not be meaningful. The final rating consists of a total number of points

that should be expressed as a percentage of the maximum possible score for the particular conditions.

See also further recommendations given in Annex A.
5 Usability evaluation forms
See the following pages.

To enhance the value and applicability of this document, the forms are also provided in a revisable

[MS Excel ] format. These forms are provided at the following URL: http://standards.iso.

org/iso/29061/-3/ed-1/en.

1) MS Excel is an example of a suitable product available commercially. This information is given for the convenience

of users of this document and does not constitute an endorsement by ISO of this product.

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ISO 29061-3:2017(E)
© ISO 2017 – All rights reserved 5
Date of evaluation Evaluated by Test no.

Form 1: Separate evaluation of CRS: Rearward facing (RF), forward facing (FF) or lateral facing (LF) with internal harness or shield

Child restraint system evaluated  Infant only CRS, RF  Infant only CRS, LF  RF only toddler CRS  FF only CRS

Manufacturer  Multiple modes CRS (2-in-1)  Multiple modes CRS (3-in-1)
Child seat make and model Base make and model (if applicable)
Country/Region of use Country/Region of use
Approval no. (where applicable) Approval no. (where applicable)
Production no. Production no.
Date of manufacturing, yyyy-mm-dd Date of manufacturing, yyyy-mm-dd

Type (E.g. UN-ECE Group 0+/I/II) Primary anti-rotational device  Top tether  Support leg  N/A

 Rebound tether  Rebound bar
CRS has separate base  Yes  No Secondary anti-rotational device  N/A
Appropriate child size range for this

mode according to manual Mass range (kg): Height range (cm): Age range (months or years):

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ISO 29061-3:2017(E)
6 © ISO 2017 – All rights reserved
Form 1.1: CRS instructions and labels
Good Average Poor Importance N/A Notes
Do CRS or base instructions Illustrated clearly with Pictures plus written Meth
...

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