1. 1A. Brearley , The Management of Drawing and Design , Gower, 1975 , p.3 .
2. 2B. Walker , Designing by computer, Ferranti Cetec Graphics Ltd. (no date). See also Chester, B., in The Engineer 23 September1982 (quoted in ?CAD: agreements and pay?, IDS Study 276, October 1982).
3. 4B. Wilkinson , The shopfloor politics of new technology , Heinemann, London, 1983 , p.11 .