AbstractThe following paper contrasts different modelling techniques in terms of performance, flexibility, and control. The authors discuss how a single scheduling problem, the Gate Assignment Problem, can be implemented using three different modelling techniques: an integer programming model, a discrete simulation, and an expert system. In doing so, the authors characterize some of the advantages and disadvantages of using the three different methods. The purpose of such an exercise is to develop criteria that can be used to select an appropriate solution technique for a particular problem.