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Timothy Quinn is absolutely right in encouraging Sanjoy to build small, elegant, informative models designed to answer well-chosen questions. Anyone can build a big computer program and I've even heard people boasting (!) that 'my model has 40000 variables (literally) so it is bigger than yours'. On...

Sanjoy, in his enthusiasm, is making the old, old, and very bad, mistake of putting the methodology before the problem. He needs to think about precisely which health/pharmaceutical policy issues he wishes to address - and there must be hundreds of them - and he then needs to define at most a few we...

Dear All, This is an interesting theme that deserves exploration. As well as Kim's simulation, there is also some qualitative SD work in the area: 'Qualitative and quantitative modelling in system dynamics: some research questions', System Dynamics Review, Vol.16, No. 3, Fall 2000, pp 225-244. That ...