Colin H. Simmons is an international engineering standards consultant and a member of numerous BSI and ISO committees dealing with technical product documentation and specifications. He is a former practising mechanical design engineer and author of many publications on engineering drawing, product specification and standards. Dennis E. Maguire was a design engineer and senior lecturer at Southall College, UK. Neil Phelps is a Production Design Manager. In his present position he manages a multi-discipline team of designers providing tooling and test equipment for production facilities. He is a member of the British Standards Institution (BSI) Technical Committee TDW/4 responsible for Technical Product Realisation and has been involved with the continued development of BS8888 since its introduction. He was also a member of the joint IED/BSI team which developed the joint certification process for training courses in Geometrical Dimensioning and Tolerancing to BS8888. He has co-authored a number of technical and educational publications on the application of Technical Product documentation/specification.