Appendix A: Event Storming, Two Levels
| Level | Question | When to Use | Output |
|---|---|---|---|
| Big Picture | “What happens in this domain within our Mission?” | Domain is unfamiliar or the team does not share a mental model | Domain events, commands, pain points, bounded contexts, candidate Issues |
| Process / Design | “How do we design this specific Feature?” | A known Feature has unclear internal flows | Detailed flows, aggregate design, acceptance criteria |
Big Picture discovers what problems exist. Use it when you need shared understanding. Do not use it if you already have it.
Process / Design solves known problems. It is a design tool, not a discovery tool.