OCR A-Level Product Design ergonomics and product analysis: a complete overview

What this topic demands

This topic tests whether you can fit a product to its users, in body and mind, and learn from existing products. The extended questions reward applying the percentile rule and ergonomic principles to a named product and weighing the trade-offs. Marks are lost when the wrong percentile is chosen, or when an inclusive feature is named without saying who it serves, and gained by tying every point to a real user. This overview ties the four dot-point pages together.

Anthropometrics and percentiles

Anthropometric data is body measurements, static and dynamic, given as percentiles: the 5th, 50th and 95th. The rule is to match the percentile to the function: clearance uses a high percentile so large users fit; reach uses a low percentile so small users can reach; a fixed dimension uses the 5th to 95th range or adjustability. Designing only for the 50th excludes most users. See anthropometrics and percentiles.

Ergonomics and user fit

Ergonomics fits the product to the user. Physical ergonomics covers posture, reach, grip, force and comfort, sized from anthropometric data. Cognitive ergonomics covers clarity, feedback, affordance and error prevention. Good ergonomics covers both and is tested with representative users through the iterative cycle. See ergonomics and user fit.

Product analysis and disassembly

Product analysis evaluates an existing product against function, materials, manufacture, ergonomics, aesthetics, sustainability, cost and market, and disassembly (reverse engineering) reveals materials, components, assembly methods and tolerances. Both inform a new design by turning weaknesses into specification criteria, and both must be used to learn, not copy. See product analysis and disassembly.

Inclusive and user-centred design

Inclusive design is the aim of serving the widest range of users without special adaptation, through adjustability, percentile ranges, simple operation and sensory accessibility. User-centred design is the process that delivers it, researching and testing with diverse users and refining iteratively. Together they widen who a product serves, at some cost. See inclusive and user-centred design.

How to revise this topic

1. Apply the percentile rule. High for clearance, low for reach, range or adjustability for a fixed dimension.
2. Cover both kinds of ergonomics. Physical fit and cognitive ease of use.
3. Link analysis to improvement. Turn each finding into a specification criterion.
4. Name who an inclusive feature serves. Weak grip, poor sight, small or large stature.
5. Separate inclusive aim from user-centred process. And weigh the cost trade-offs, then attempt the quiz.