The capacity of certain technical resources for carrying out a function can be specified for the connections between the functions and the technical resources, for example, how often they can be requested at the same time. The required capacity is specified using the Required capacity attribute (Simulation attribute type group) of the connection, whereas the available capacity is specified using the Capacity attribute of the technical resource. The default value for the Capacity attribute is 1. A function with an allocated technical resource can only be carried out if the available capacity is equal to or greater than the required capacity. Otherwise, the function is subject to dynamic wait time. If the resource provides a multiple of the capacity required, the function can be carried out simultaneously a corresponding number of times.