In the internationally accepted methodology of the non-proprietary standard business process modelling In Figure 13.3, such a subset is illustrated for the process of passport application in a Swiss city. It uses notation (BPMN). For purposes of modelling, BPMN uses flow objects, connecting objects and artifacts. Flow objects describe what is happening: in the form of circular events, they describe the start, interruption and end of a process. Rectangular activities stand for the tasks in a process and show sub-processes (marked by a ‘+’). Diamond-shaped gateways mark the diverging and converging of processes. Connecting objects join flow objects through arrows. Unbroken arrows indicate the process flow, broken arrows indicate information flows between different organizations, and broken lines represent associations. Finally, the example also shows artifacts in the form of data objects, which are used to describe more closely data used by activities. These are symbolized by a sheet of paper with the upper right-hand comer folded over. The various parties involved are separated from one another by ‘swimming lanes’ (within an organization) or ‘pools’ for different organizations (see Figure 13.3).