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In this chapter we will learn how to model complex business processes with BPMN. The constructs presented in this chapter build on top of the knowledge acquired in Chap.  3 . In particular, we will expand on activities, events and gateways. We will learn how to use activities to model sub-processes and how to reuse these sub-processes across different processes. We will also extend activities to model more sophisticated forms of rework and repetition. As per events, we will expand on message events, present temporal events and show how race conditions can be modeled among these event types via a new type of gateway. We will also learn how to use events to handle business process exceptions. Finally, we will show how a collaboration diagram can be abstracted into a choreography diagram that only focuses on the interactions between the involved business parties.