“…(DES, 1985, p. 41) The simplest representation of mathematical modelling is a two-stage diagram illustrating the translation of a real world problem into mathematics and the interpretation of the mathematical solution back into the terms of the original problem (see, for example, Burkhardt, 1981;Armstrong and Bajpai, 1988). These stages, and the processes involved in moving between them, have been amplified into flowcharts or algorithms by several researchers (eg : Moscardini et al, 1984;Swetz and Hartzler, 1991).…”