Enterprise BPMN is getting more and more popular with our customers, since they can add anything they want to the BPMN standard, except one thing: process interfaces.
In 2 out of 3 customer projects this is the main "problem" when using BPMN.
Please consider adding them to the method, to add not only most but all benefits from EPC to E-BPMN :)
As a best practice: Process Interfaces can be modeled as black-box pools with assignments inside of BPMN.