Inclusive Design & Ergonomics

This lesson covers how designers create products that are comfortable, easy to use and accessible to the widest possible range of people. These concepts are central to AQA GCSE Design and Technology (8552), Section 3.1.1, and are essential for both exam answers and your NEA project.

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What Is Ergonomics?

Ergonomics (also known as human factors) is the study of how people interact with products, systems and environments. The goal is to design products that fit the user — not force the user to adapt to the product.

Key Ergonomic Factors

Factor	Description	Example
Size and shape	The product must fit the user's body dimensions	A chair seat height that suits the average adult
Comfort	The product should not cause pain or fatigue during use	A cushioned bicycle saddle
Ease of use	Controls and interfaces should be intuitive	A kettle with a clearly labelled on/off switch
Safety	The product should not cause injury	Rounded corners on a children's table
Efficiency	The product should help the user complete tasks effectively	A well-designed kitchen layout that reduces walking

Anthropometrics

Anthropometrics is the study of human body measurements. Designers use anthropometric data to ensure products suit the intended user group.

Measurement	Used In
Hand span	Designing phone screens, tool grips, gloves
Sitting height	Chair backs, vehicle headrests
Arm reach	Dashboard controls, kitchen shelf heights
Foot length	Shoe design, pedal placement
Head circumference	Helmet sizing
Grip strength	Tool handles, jar lids, door handles

Percentile Ranges

Not everyone is the same size. Designers typically use data from the 5th percentile (smaller users) to the 95th percentile (larger users) to design products that fit 90% of the target population.

• 5th percentile female: Used for minimum reach distances (e.g. can the smallest user reach the shelf?)
• 95th percentile male: Used for clearance dimensions (e.g. can the largest user fit through the doorway?)
• 50th percentile: The average; used for fixed-dimension items (e.g. standard chair height)

AQA Exam Tip: If a question asks how a designer uses anthropometric data, give a specific measurement and explain how it informs the design. For example: "The designer would use the 5th percentile female hand span to ensure the smallest users can comfortably grip the handle."

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What Is Inclusive Design?

Inclusive design (sometimes called universal design or design for all) is the practice of designing products that can be used by as many people as possible, including those with disabilities, the elderly and people of different cultures.

Principles of Inclusive Design