This European Standard provides terms and definitions on concepts and parameters used for EN 1005-21), prEN 1005-3:2001, EN 1005-41) and EN 1005-51). Basic concepts and general ergonomic principles for the design of machinery are dealt with in EN 292-1, EN 292-2 and EN 614-1. This document is not applicable to specify the machinery which is manufactured before the date of publication of this document by CEN. 1) This European Standard is under preparation by CEN/TC 122/WG 4 "Biomechanics".