Information flow diagrams are suitable for illustrating the flow of data between functions. For this purpose, two functions can be interlinked by a data flow object in an information flow diagram. This object indicates that a data flow exists that runs from the source function to the target function. If you want to further specify the data objects that are input for or output of the functions displayed, you can assign a data model to this object, which results in the formation of a hierarchy for this data flow object. The data model serves to illustrate the information objects exchanged between the functions. Depending on the degree of detail of the functions under consideration, the information objects can be Cluster/Data models, entity types, or ERM attributes. An example of this type of representation is shown in the following figure.