This paper considers the professional responsibilities and ethical iss
ues associated with engineering modelling. The ethical issues are firs
t delineated. Several engineering cases of faulty modelling (and their
disastrous consequences) are next presented, with suggestions as to h
ow greater sensitivity to ethical considerations might have prevented
the problems, The issues are then extended to large-scale economic sys
tem modelling with an example taken from the recent past of engineerin
g-economic system modelling. Conclusions are made regarding the essent
ial importance of the connections between modelling and ethics. Copyri
ght (C) 1997 Elsevier Science Ltd.