1. French, M. J., Conceptual Design for Engineers, 2nd Ed, Design Council, London, 1985.
2. Rychener, M. D., (Ed), Expert Systems for Engineering Design, Academic Press, Boston, 1988.
3. Fischer, G., “Communication requirement for co-operative problem solving systems”, Journal of Information Systems, Vol 15, No. l, 1990, pp 21–36.
4. Oh, V., “Intelligent Design-Assistant Systems for Engineering Design”, Technical Report EDC 1993/02, Lancaster University, Lancaster, 1993.
5. Bracewell, R. H., Bradley, D. A., Chaplin, R. V., Langdon, P. M. and Sharpe, J. E. E., “Schemebuilder: A design aid for the conceptual stages of product design”, Proc 9th Int’l Confon Engineering Design ICED’93, The Hague, 1993, pp 1311–1318.