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Aesthetics
How a product looks, feels and sounds, and the judgements people make about it from those qualities, controlled through shape, proportion, colour, texture and finish.
Anthropometrics
The measurement of human body sizes, such as height, reach, hand width and grip strength, collected from large samples so designers can size products to fit real people.
Ergonomics
Designing a product so it fits the body and the way people move, so it can be used comfortably, safely and without strain over long periods.
Inclusive design
Designing one product that as many people as possible can use, including people with limited strength, dexterity, sight or hearing, without needing a separate special version.
Percentile
A point on a ranked set of measurements showing what share of people fall below it, so the 5th percentile height is the height that only 5 per cent of the group are shorter than.
Persona
A short written profile of one invented but realistic user, built from real research, giving their situation, needs and frustrations so design decisions can be tested against a specific person.