Comments on Hans Fuss

Place-Transactor-Nets are a significant extension of modelling techniques. Place-Transactor-Nets belong to the family of graphtheoretical models and have therefore a fixed, limited application area. The description of the application area for which the Place-Transactor-Nets are well suited is missing. A conceptual model from the family of system-dynamics models should be preferred for the representation of a system corresponding to the problem study 3. Such a conceptual model is well suited for the representation of models in which variation rates and feedbacks (countermeasures) are significant.