Road vehicles — Methods and criteria for usability evaluation of child restraint systems and their interface with vehicle anchorage systems — Part 5: Installation and securing of child in a booster system
ISO 29061-5:2017 provides criteria for judgement of usability of booster seat child restraint systems (CRS) when installing them and securing a child. ISO 29061-5:2017 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. The procedure can also be used for evaluation of vehicle integrated booster systems. NOTE 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 (LATCH, UAS).
Véhicules routiers — Méthodes et critères pour l'évaluation de la facilité d'utilisation des systèmes de retenue pour enfants, et leurs interfaces avec les systèmes d'ancrage dans le véhicule — Partie 5: Installation et fixation d'un enfant dans un système de réhausseur
Standards Content (Sample)
Road vehicles — Methods and criteria
for usability evaluation of child
restraint systems and their interface
with vehicle anchorage systems —
Installation and securing of child in a
Véhicules routiers — Méthodes et critères pour l'évaluation de la
facilité d'utilisation des systèmes de retenue pour enfants, et leurs
interfaces avec les systèmes d'ancrage dans le véhicule —
Partie 5: Installation et fixation d'un enfant dans un système de
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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 .16
Annex B (informative) Example usability rating classes .17
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A list of all parts in the ISO 29061 series can be found on the ISO website.
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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 (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
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 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).
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INTERNATIONAL STANDARD ISO 29061-5:2017(E)
Road vehicles — Methods and criteria for usability
evaluation of child restraint systems and their interface
with vehicle anchorage systems —
Installation and securing of child in a booster system
This document provides criteria for judgement of usability of booster seat child restraint systems (CRS)
when installing them and securing a child.
The 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.
The procedure can also be used for evaluation of vehicle integrated booster systems.
NOTE 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 (LATCH, UAS).
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
capable of being heard in normal environmental conditions
any kind of belt-positioning child restraint system (3.3) where the adult seat belt is the primary restraint
for the child
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child restraint system
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
multiple modes CRS
type of CRS (3.3) that can be used in several modes, for example converting from integral to non-
integral, or for use in different orientations
any deviation from the intended application and use of a CRS (3.3) that might reduce its protective
illustration or photo used to represent a concept or an operation, which can be supplemented by text
operation that can be completed without the need to undertake a secondary action
EXAMPLE A single action 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.
unintended looseness of a strap that is likely to affect the performance of the CRS (3.3) adversely
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 (3.3) is capable of being used and is convenient and practical in use (separately or in combination with a
[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 booster systems, i.e. booster seats with
or without seatbacks, including booster seats integrated in the vehicle seat, and the securing of a child
in the seat. The procedure evaluates the 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 installation in a
The assessment is done in three steps:
— a separate assessment of the booster system;
— a usability assessment when installing the booster system in specified vehicle seating positions; and
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— securing a child or child dummy in the booster system.
The evaluation takes into consideration the various modes of installation and conversions between
installation modes. The usability protocol, consisting of two forms, is intended to be objective and
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 takes about 30 min.
The necessary materials include:
— the usability evaluation form (in either paper or electronic format);
— the vehicle owner’s manual;
— the CRS manual, including instruction video if applicable; and
— a force gauge for measuring belt tension.
A copy of the terms and definitions from this document may also be helpful.
Initially, the booster system should be in the condition as supplied to the consumer. The evaluation
process includes all the steps, including assembly, to complete the installation.
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 mode of use for the booster system 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, then the ease of positioning the
booster seat followed by securing the child or child dummy, and finally the removal of the child restraint
system. Installation and removal does not apply to integrated systems.
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 of the booster system. 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.
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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.
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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Date of evaluation Evaluated by Test no.
Form 1: Booster system, separate evaluation
Child restraint system evaluated Backless booster cushion Booster seat with seatback Integrated booster system Other (convertible/combination, etc.)
Child seat make and model Booster system features:
Country/Region of use Multiple modes CRS (2-in-1) Multiple modes CRS (3-in-1)
Approval no. (where applicable) Booster seat using ISOFIX anchorages evaluated with / without ISOFIX
Production no. Booster seat with removable seatback: Seatback on Seatback off
Date of manufacturing, yyyy-mm-dd
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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Form 1.1: CRS instructions and labels