Anthropometrics is the study and measurement of human body dimensions. In Design Technology, designers use anthropometric data to make products, environments, and systems fit the intended users safely, comfortably, and effectively.
How Anthropometrics Informs Design
Anthropometric measurements include height, shoulder width, hand size, seated eye height, and arm reach. Designers usually collect or select data from a defined target population, because measurements vary with factors such as age, sex, ethnicity, and physical ability.
The data are often organized into percentiles. A percentile shows the percentage of a population whose measurement is equal to or below a particular value. For example, a 95th-percentile body width is as wide as or wider than the measurements of approximately 95% of the sampled population.
| Design requirement | Typical anthropometric approach | Example |
|---|---|---|
| Clearance | Accommodate larger users, such as the 95th percentile | Doorway height or legroom |
| Reach | Accommodate smaller users, such as the 5th percentile | Position of controls or shelves |
| Adjustability | Cover a range, commonly from the 5th to the 95th percentile | Office-chair height |
Designers may use static anthropometric data, measured when the body is in a fixed position, or dynamic anthropometric data, which considers movement and functional reach. Dynamic data are important when a user bends, stretches, rotates, or operates controls.
A common misconception is that designing for the “average person” accommodates most users. It often does not: a person with average height may not have average arm length, shoulder width, or hand size. Designing for a percentile range or providing adjustability is usually more inclusive.
Exam Technique
For an IB Design Technology response, identify the relevant body measurement, specify the target population and percentile, and explain how these determine a design feature. For evaluation, consider limitations such as outdated datasets, clothing, posture, measurement methods, and population differences. Do not use anthropometrics as a synonym for ergonomics: anthropometrics supplies body-measurement data, while ergonomics applies human factors to optimize interaction with a design.
