Ergonomics is the application of scientific information about people to the design of products, systems and environments. It matters because designing around users' capabilities and limitations improves safety, comfort, usability and performance.
The Reasoning and Mechanism
In IB Design Technology topic A1.1, ergonomics examines the interaction between a user, a product and the surrounding environment. Designers collect and apply human data so that a design fits its intended target population, rather than expecting users to adapt to a poorly designed product.
| Ergonomic factor | What the designer considers | Design example |
|---|---|---|
| Physical ergonomics | Body dimensions, posture, strength, reach and repetitive movement | An adjustable office chair supports different body sizes and reduces muscular strain. |
| Cognitive ergonomics | Perception, memory, attention, decision-making and mental workload | Clearly differentiated controls reduce errors when operating machinery. |
| Environmental ergonomics | Lighting, noise, vibration and temperature | A high-contrast display remains readable under low lighting. |
Anthropometrics provides measurements of the human body, such as stature, hand breadth and seated eye height. Designers may use percentile data: for example, a door height should accommodate taller users, while a control must remain within the reach of shorter users. Where one fixed dimension cannot serve the whole target population, adjustability offers a stronger solution.
A common misconception is that ergonomics means only making a product comfortable. Comfort is important, but ergonomics also reduces injury and error, increases efficiency, and makes products easier and safer to use. A comfortable control that is confusingly labelled is not fully ergonomic.
Exam Technique
For an IB response, do not merely state that a design is “ergonomic.” Identify the relevant user characteristic, explain the design decision, and connect it to an outcome. For example: “An adjustable seat height accommodates a wider range of anthropometric percentiles, improving posture and reducing fatigue.” This creates a clear evidence-to-design-to-impact chain.
