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International
Standard
ISO 10075-2
Second edition
Ergonomic principles related to
2024-07
mental workload —
Part 2:
Design principles
Principes ergonomiques relatifs à la charge de travail mental —
Partie 2: Principes de conception
Reference number
© ISO 2024
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Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design principles . 2
4.1 General principles .2
4.2 Design principles in relation to work organisation .3
4.2.1 Perform system design reviews and include prospective risk assessment .3
4.2.2 Individuals’ and team work-related objectives .3
4.2.3 Extended reachability . .4
4.2.4 Flexibility in time allocation .4
4.2.5 Definition of work-related services .5
4.2.6 Duration of working hours .5
4.2.7 Time off between successive work days or shifts .5
4.2.8 Time of day .6
4.2.9 Shift work .7
4.2.10 Breaks and rest pauses .7
4.3 Design principles in relation to working tasks .7
4.3.1 Operating strategies .7
4.3.2 Continuous time constraints .8
4.3.3 Flexibility of decision-making .8
4.3.4 Ambiguity of task goals .9
4.3.5 Complexity of task requirements .9
4.3.6 Time sharing .10
4.3.7 Dimensionality of motor performance .10
4.3.8 Mental models .11
4.3.9 Parallel versus serial processing .11
4.3.10 Decision support . .11
4.3.11 Sustained attention . 12
4.4 Design principles in relation to job . 12
4.4.1 Social interaction . 12
4.4.2 Dependencies on others' task performance . 13
4.4.3 Identical task requirements . 13
4.4.4 Confidential communication .14
4.4.5 Changes in task-related activities with different demands or types of mental
workload .14
4.5 Design principles in relation to work equipment and interfaces .14
4.5.1 Design the socio-technical system transparent for the user .14
4.5.2 Re-evaluate after adopting an assistance system to an existing system . 15
4.5.3 Time lag . 15
4.5.4 Adequacy of information . . 15
4.5.5 Ambiguity of information .16
4.5.6 Signal discriminability .16
4.5.7 Redundancy .16
4.5.8 Compatibility .17
4.5.9 Accuracy of information processing .18
4.5.10 Controllability .18
4.5.11 Control dynamics .18
4.5.12 Tracking requirements .19
4.5.13 Error tolerance .19
4.5.14 Adjust system design .19
4.5.15 Anticipate shifts in operating states and potential consequences . 20
4.5.16 Coupling in human-machine arrangements . 20
iii
4.5.17 Adaptable and adaptive human–automation interaction .21
5 Information and training .21
Annex A (informative) Design principles and their relation to the impairing consequences of
mental strain.22
iv
Foreword
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This document was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 1, General
ergonomics principles, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 122, Ergonomics, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 10075-2:1996), which has been technically
revised.
The main change is as follows:
— The structure is now based on working conditions and no longer on strain consequences. All design
principles are formulated positively and are divided into three parts, namely justification, guidelines
and examples.
A list of all parts in the ISO 10075 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete list
...