Abstract: The invention relates to a method for operating a roller bar screen and to the generation of certain parameters for optimal adaptation to the bulk material being processed and as a prerequisite for process optimization. Construction measures—essentially equipping the rollers with variable speed drive mechanisms—are taken in a first preparatory step. Selected control variables and limit values related to the average characteristics to be expected of the bulk material are generated in a single operation by means of a regulation and process control system. The optimum number of revolutions for each individual roller in particular is predetermined in dependence on the process. The rollers can be grouped together.