I’ve done this extensively, almost exclusively on plants and their exchanges of mass, energy, and momentum with the environment. I’ve seen my share of good and bad models, so that I’ve developed a deep philosophy of biological modeling. This may prove of use in evaluating models or planning efforts in modeling. In a particular topic, optimizatoin modeling, Tom Buckley, now of the University of Syndey, and I have converged on a strong aversion to the common application of optimization.