Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
ISO 26800:2011 — Ergonomics — General Approach, Principles and Concepts
The foundational framework for human-centred design: principles, concepts, and the ergonomics-oriented design process
ISO 26800:2011 is the foundational International Standard that presents the general ergonomics approach and specifies the fundamental principles and concepts underpinning all ergonomics-related work. Developed by ISO/TC 159/SC 1 (General ergonomics principles), this standard provides a high-level, integrated framework that unifies physical, cognitive, social, and organizational ergonomics into a coherent design philosophy. It serves as both a reference for practicing ergonomists and an entry point for engineers, architects, and project managers who need to incorporate human factors into their designs.
ISO 26800 is explicitly designed as the top-level framework standard for all ergonomics International Standards. Whether you are designing a control room (ISO 11064), a medical device (IEC 62366), or a software interface (ISO 9241), the principles in ISO 26800 apply universally.
1. Core Principles of Ergonomics
The standard identifies three overarching principles that guide all ergonomics activities: human-centred approach, criteria-based evaluation, and the iterative nature of design.
Human-centred approach: This principle requires that the characteristics, needs, values, abilities, and limitations of the target population be considered throughout the entire design process. The standard emphasizes that humans are not simply components of a system but the central focus around which everything else is organized. Design decisions must be based on empirical data about human capabilities, not assumptions.
Criteria-based evaluation: Ergonomic quality cannot be assumed — it must be measured against defined criteria. The standard requires that specified criteria be established before evaluation, covering aspects such as safety, health, well-being, performance, effectiveness, efficiency, satisfaction, and accessibility.
| Principle | Description | Application Example |
|---|---|---|
| Human-centred | Design around human characteristics and needs | Adjustable workstation heights for 5th to 95th percentile anthropometry |
| Criteria-based evaluation | Measure against defined ergonomic criteria | Usability testing with task completion time and error rate metrics |
| Iterative design | Design-evaluate-redesign cycles | Prototype testing with user feedback loops throughout development |
| System approach | Consider all interacting elements holistically | Workplace design includes lighting, noise, workflow, and social factors |
| Sustainability | Long-term impact on people and environment | Design for maintainability, adaptability, and demographic change |
The human-centred principle extends beyond physical ergonomics. In cognitive ergonomics, it means designing displays and controls that match human information processing capabilities — for example, presenting no more than 7 plus or minus 2 chunks of information at a time, consistent with Miller Law of working memory capacity.
2. Key Concepts: System, Load-Effects, Usability, and Accessibility
ISO 26800 introduces four interconnected concepts that form the intellectual backbone of ergonomics practice.
The system concept: Ergonomics views people, equipment, processes, and environments as elements of a larger system. A system is defined as a combination of interacting elements organized to achieve one or more stated purposes. Importantly, the user is not considered a component of the system they are using — both the user and the system are components of a higher-level system. This subtle distinction prevents designers from treating humans as predictable machine components and acknowledges human variability and autonomy.
The load-effects concept: External load (conditions and demands placed on a person) produces internal load (the person physiological and psychological response). The same external load can produce different internal loads in different individuals due to variations in capacity, skill, experience, and other personal characteristics. The effects of internal load can be positive (training effects, skill development), neutral, or negative (fatigue, stress, injury). This concept is fundamental to understanding why a workplace that is safe for one person may be hazardous for another.
Usability: Defined as the extent to which a system, product, or service can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use. Usability is not a property of the product alone — it emerges from the interaction between the product, user, task, and environment.
Accessibility: The extent to which products, systems, services, environments, and facilities can be used by people from a population with the widest range of characteristics and capabilities. Accessibility extends usability to include people with permanent, temporary, or situational limitations — including elderly persons and persons with disabilities.
| Concept | Key Question | Design Implication |
|---|---|---|
| System | What are the boundaries and interactions? | Consider all stakeholders, not just direct users |
| Load-effects | How does demand affect different individuals? | Accommodate variability in human capacity |
| Usability | Can users achieve goals effectively and efficiently? | Test with representative users in realistic contexts |
| Accessibility | Can people with diverse abilities use the design? | Design for the widest possible population |
A common mistake in engineering design is to optimize for the average user. ISO 26800 explicitly warns against this — the average user is a statistical abstraction that may represent no actual person. Design should instead accommodate a range (typically the 5th to 95th percentile) of relevant human characteristics, or better yet, provide adjustability.
3. The Ergonomics-Oriented Design Process and Conformity
Clause 6 of ISO 26800 outlines the basic requirements for an ergonomics-oriented design process. Unlike prescriptive standards that dictate specific measurements, ISO 26800 provides a process framework that can be adapted to any design context: analysis of context, specification of requirements, design concept generation, evaluation, and iteration.
The standard also addresses conformity (Clause 7), recognizing that conformity with ISO 26800 alone is not sufficient to claim compliance with ergonomics requirements given the standard high-level nature. Conformity can be claimed either by demonstrating application of the ergonomics approach and principles throughout the design process, or by referencing the specific ergonomics International Standards that apply to the particular domain.
Mere compliance with component-level ergonomics standards does not guarantee a well-designed overall system. ISO 26800 emphasizes that ergonomics must be addressed at the system level. A control room may have individually well-designed workstations, but if the overall layout creates communication barriers, the system-level ergonomics have failed.
Frequently Asked Questions
Q1: How does ISO 26800 relate to ISO 6385 (Ergonomics of work systems)?
ISO 6385 focuses specifically on work systems. ISO 26800 is broader — it covers all contexts (work, home, leisure, public spaces) and provides the general approach, principles, and concepts that apply to any ergonomics activity.
ISO 6385 focuses specifically on work systems. ISO 26800 is broader — it covers all contexts (work, home, leisure, public spaces) and provides the general approach, principles, and concepts that apply to any ergonomics activity.
Q2: Is ISO 26800 relevant for software and digital product design?
Absolutely. The concepts of usability, accessibility, and human-centred design are directly applicable to software interfaces. The standard principles have been operationalized in ISO 9241-210 (human-centred design for interactive systems).
Absolutely. The concepts of usability, accessibility, and human-centred design are directly applicable to software interfaces. The standard principles have been operationalized in ISO 9241-210 (human-centred design for interactive systems).
Q3: Does ISO 26800 provide specific anthropometric data or design dimensions?
No. ISO 26800 is a principles-level standard and does not contain specific measurements. Anthropometric data are found in dedicated standards such as ISO 7250.
No. ISO 26800 is a principles-level standard and does not contain specific measurements. Anthropometric data are found in dedicated standards such as ISO 7250.
Q4: How should an organization demonstrate conformity with ISO 26800?
Organizations can demonstrate conformity by documenting the systematic application of ergonomics principles throughout the design process — from initial analysis through iterative evaluation.
Organizations can demonstrate conformity by documenting the systematic application of ergonomics principles throughout the design process — from initial analysis through iterative evaluation.
