Ergonomics
If products are to be used by people then some consideration of the sizes of consumers hands, legs, heads, arms, etc should be included in the design.  If a motor vehicle had control pedals that were 2 metres from the seat then it would be difficult to operate the pedals and sit in the seat - Not the ideal situation for a comfortable trip !  A product can be said to be ergonomically well designed if it has taken account of the users' size and attributes and consequently is comfortable and efficient in its use.  Anthropometrics and Ergonomics are therefore very closely linked.