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The World's Shortest and Most Chaotic Introduction to Event Storming @mathiasverraes @jbpros

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Mathias Verraes Independent Consultant @mathiasverraes verraes.net

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Julien Biezemans Co-founder at Cucumber @jbpros

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The Grand Dichotomy of Systems1 Things vs Processes 1 "Rethinking System Analysis and Design" — Gerald M. Weinberg

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Event Storming: visually modelling behaviour over time

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Today: Big Picture Event Storming Exploration — Ubiquitous Language — Processes

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Going further: Design Level Event Storming Precision — Constraints — Processes Dependencies — Messaging — Event Sourcing Bounded Contexts — Concurrency — Race Conditions — ...

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Domain Event Something has happened in the past that is relevant to the business Past tense: Trip has Started

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Command An instruction that a user (or another system) sends to your system Imperative: Start Trip

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Business Rule A constraint that determines the outcome (Events) of a particular Command

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Given there is a user vs Given a user has registered Given Event And Event When Command Then Event

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@mathiasverraes verraes.net