We can see term process and modeling of process in information technologies daily. Process system object which is characterized by its memory space and context. We will use school modeling processes in this paper. For modeling we use tool of Petri nets. This tools are used to create example of process, this example measure way of student through study. Every student has way through study different, has his duty lessons and vote other. Normal Petri nets are defined by rules, events, arrows leads from rules to events and arrows leads from event to rules and tokens indicating logical state of conditions. One of main properties is accomplishment of condition, every condition is indicated by token and state of network is created by conditions, which are in this time accomplished.