The importance of comminution processes for industrial material processing is crucial and the available selection of crushers and mills - adapted to strength/hardness of the material to be ground, the fineness of the feed and product, the throughput required, etc. - is wide. The description of a comminution process is also nowadays despite the progress as to the fundamentals of comminution and as to the knowledge of the processes in comminution equipment - possible only to a limited extent. In this respect, modeling and simulation of comminution from the model to a mathematical algorithm is necessary and helpful. In this contribution, several possible models are presented: regression models, models derived from the fundamentals of comminution processes and, finally, models related to the general process equation of mechanical process engineering.