This paper begins by summarising some milestones in the expansion of the system dynamics methodology to give a background to multi- criteria optimization in system dynamics. The case of ‘Inventory Control Policies’ from Jarmain’s (Editor) “Problems in Industrial Dynamics” is then used as an example to show how Wierzbicki’s method in multi-criteria optimization can be adapted to system dynamics. The solution procedure transforms the model into a discrete trajectory in time.