TORSTEN HILDEBRANDT is branch manager at SimPlan AG, Germany, one of the largest tool-vendor-independent service providers in the field of simulation. His research interests include simulation-based optimization, heuristic optimization algorithms, as well as planning and control of production and logistic systems in general. He is the main author of the discrete-event simulation library jasima (JAva SImulator for MAnufacturing and logistics, http://jasima.net). His email address is Torsten.Hildebrandt@simplan.de.