The Pizza Collaboration
Extracted from BPMN 2.0 by Example (non-normative OMG document)
This example is about Business-To-Business-Collaboration. Because we want to model the interaction between a pizza customer and the vendor explicitly, we have classified them as “participants”, therefore providing them with dedicated pools. Please note that there is no default semantics in this type of modeling, which means you can model collaboration diagrams to show the interaction between business partners, but also zoom into one company, modeling the interaction between different departments, teams or even single workers and software systems in collaboration diagrams.