Learning route4 focused lessons
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A1.1Ergonomics
Design products, systems and environments around human capability and limitation.
Key vocabulary6 terms to connect
Concept lens
What to notice as you learn
Look for the relationship between evidence, the designer’s decision, and the resulting impact on people, performance or context. Strong answers explain that link, rather than naming a concept alone.
ergonomicsanthropometricspercentilesreachclearancehuman factors
Interactive lesson pathway
Learn the idea, apply it, then check it.
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Ergonomics as an interaction
Understand how interaction between people and designed solutions informs ergonomic improvement.
Success criteriaBy the end, you can…
- Define ergonomics through the relationship between people and what they use.
- Identify movement, posture, reach, force, repetition and context during use.
- Explain how a design choice could influence efficiency, usability, functionality, effectiveness or safety.
Foundation concept
Ergonomics is a relationship, not a product feature
Ergonomics examines what happens when a person uses a product, system or environment. The important unit of analysis is the interaction: who is using it, what task they are trying to complete and the conditions in which use takes place.
A chair, handle or control is not “ergonomic” by itself. Its suitability depends on the intended user, task and context. The same control may work well for a standing adult but create a difficult reach for a seated child.
The intended user and their physical capabilities or limitations.
A product, connected system or surrounding environment.
The movement, posture, reach and effort required during a task.
Observation lens
Read the body–product conversation
Before suggesting an improvement, describe what you can observe. Strong ergonomic analysis separates evidence from judgement.
How the body changes position while the task is completed.
The position maintained during use, including bending or twisting.
How far the user must extend to access a control or surface.
The effort used to grip, push, pull, lift or turn.
How often an action is repeated and for how long.
Space, lighting, noise, temperature and surrounding equipment.
Design reasoning
Connect evidence → decision → impact
Imagine that users with lower hand strength struggle to open a smooth, narrow bottle cap. The evidence is high grip force and slipping. A designer could increase the cap diameter and add texture. The likely impact is lower required grip force and improved control.
Notice the cautious language: the change may improve usability and safety for the intended users. It does not guarantee that every person can use the product.
Worked application
Distinguish the outcome you are trying to improve
A classroom paper cutter can perform its cutting function yet still be difficult for a particular user to operate. Functionality concerns the functions available; effectiveness concerns achieving the intended result; efficiency concerns the resources used to achieve it; usability concerns the experience of intended users completing tasks in context. These overlap, but they are not interchangeable measures.
For example, a larger labelled control might reduce searching, but an equally visible label in an unfamiliar language may not improve understanding. Establish a baseline, change the relevant feature and compare the same task. A faster attempt that produces more errors does not demonstrate an overall improvement.
Consider product, system and environment together. A container handle is a product feature; the sequence for borrowing and returning the container is part of a system; shelf height, glare and available space are environmental conditions. Changing only the handle may leave the main barrier untouched.
| Outcome | Evidence for filling and closing a reusable bottle | Possible design response |
|---|---|---|
| Functionality | The closure provides the intended opening and sealing functions | Provide the required functions and verify how they operate |
| Effectiveness | Users fill to the intended level and close the bottle without leaks | Improve level visibility and closure feedback |
| Efficiency | Measure time, actions or effort for successful completion | Reduce unnecessary actions while retaining accuracy |
| Usability | Record first-use success, assistance, errors and user experience | Make the sequence understandable and manageable |
| Safety | Identify foreseeable pinching, spilling or handling hazards | Reduce the hazard and verify the change; do not infer safety from speed alone |
Pause and apply
One-minute interaction audit
Choose a desk lamp, water bottle or classroom chair that you can observe.
Identify the user, task and context. Then write one evidence → decision → impact statement.Reveal model thinking
- Evidence: describe an observable movement, posture, reach or force requirement.
- Decision: state one specific feature that could change.
- Impact: connect that change to efficiency, usability, functionality, effectiveness or safety.
Aligned to IB Design Technology A1.1.1 (first assessment 2027). Original explanations, examples and learning activities © 2026 Grant Li.
A1.1.1 Topic knowledge check
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