Event-driven styles are, undoubtedly, well suited for workflow-driven workloads, but the nature and complexity of the processing will influence your choice of underlying constraints. The Choreographed Event-Driven Abstract Style introduced in the last chapter offers a very high degree of agility and architectural extensibility, but this approach brings certain limitations. In this chapter, we will look at another event-driven abstract style that changes two defining constraints to address some of those limitations. Every architectural style introduces a different set of trade-offs. It is up to you to determine which set of trade-offs make the most sense in the context of a project or to derive a tailored style that provides the right capabilities where they are needed most.