Although BPMN supplies only the Business process diagram (BPD) model type, two model types can be used in ARIS: the EPC and the new Business process diagram (BPD) model type. In this way, processes existing in ARIS can be reused as private processes. The EPC has all the model attributes that are specified by BPMN for the business process diagram. By using the Business process diagram (BPD) model type, you keep existing models of the EPC type free of B2B-specific aspects. As a result, the complexity of EPC models does not rise due to additional relationship types.

The new business process diagram in turn inherits all BPMN-relevant model attributes from the EPC and all sequence flow-relevant objects, connections, and symbols. The new Business process diagram (BPD) model type allows sequence flow-relevant EPC concepts to be reused. It is also possible to depict pools, lanes, and message flows.