methodatlas
Domain Modeling

EventStorming

Turns domain knowledge, language, and system boundaries into a tangible result by selecting a business flow, collecting domain events chronologically, and deriving models and follow-up questions.

Core question
Which business events, triggers, and boundaries shape the flow, and where do friction, risk, or learning needs arise?
MediumWorkshop2-8 h
Open runsheetPlan sessionStart comparison
Purpose

The method helps clarify the domain, language, and system boundaries concretely. It translates domain knowledge into events, terms, rules, or boundaries. The result is captured as an event timeline, ubiquitous language, and boundaries.

How it works

The team follows the steps: select business flow, collect domain events chronologically, add commands, actors, and policies, mark pain points and boundaries, and derive models and follow-up questions. Each step is captured visibly. At the end, an event timeline, ubiquitous language, and boundaries are available so decisions, tests, or actions can follow directly.

Visual orientation

Method sketch for a quick mental model.

EventStorming · Big PictureDomain Events, Commands, Actors, Policies, Hot Spots und Context-Grenzen entlang einer Business-Timeline sichtbar machen
EventStormingEine breite EventStorming-Wand zeigt Domain Events entlang einer Zeitachse, ergänzt durch Commands, Actors, Policies, Read Models, Hot Spots und Context-Grenzen.Domain-Wissen als chronologische Ereigniswand sichtbar machenOrange Events bilden den Flow, weitere Farben ergänzen Auslöser, Regeln, Hot Spots, Read Models und Grenzen.Business Flow als Event-Timelineerst Events sammeln, dann Auslöser, Regeln, Hot Spots und Grenzen ergänzenStartEndeOrderingPaymentShippingCustomerActorPlace OrderCommandPSP WebhookTriggerReserve StockPolicyCartCreatedOrderPlacedPaymentAuthorizedReservationConfirmedOrderShippedStock AvailabilityRead ModelRace Conditionunklare GrenzeEventCommandPolicyHot SpotRead Model

Flow

  1. 1Select business flow
  2. 2Collect domain events chronologically
  3. 3Add commands, actors, and policies
  4. 4Mark pain points and boundaries
  5. 5Derive models and follow-up questions

The runsheet guides execution with 5 phases, timeboxes, 5 pitfalls, and clear stop criteria.

Open runsheet

Ideal for

  • Complex domains
  • Cross-functional discovery
  • Event-driven systems

Not good for

  • Trivial CRUD processes
  • Solo documentation
  • Low-level code design

Deep dive

In detail

EventStorming follows a clear working logic: select business flow, collect domain events chronologically, add commands, actors, and policies, mark pain points and boundaries, and derive models and follow-up questions. This turns the method into a visible thinking process rather than only a conversation. Participants move step by step from raw material, observations, or options toward a shared structure. The result is an event timeline, ubiquitous language, and boundaries that make decisions, learning, or further planning actionable.

Facilitation

Prepare a clear guiding question, the right information, and a visible workspace. Plan about 2-8 h with 5-12 people and use the format in a facilitated workshop. The facilitation needs noticeable structure and preparation; short timeboxes, visible intermediate results, and a parking lot for open questions help.

Output artifacts
Event TimelineUbiquitous LanguageBoundariesOpen Questions
Tags
DDDeventsdiscoveryworkshop

Sources

EventStormingeventstorming.comEventStorming | Avanscopertaavanscoperta.it
Artifact templates
Event Storming Working TemplateCompact working template for Event Storming with context, input, output artifacts, and next step.
markdown

event-storming-working-template.md

Compact working template for Event Storming with context, input, output artifacts, and next step.

Event Storming Working Template

Goal

Rapid, visual domain exploration through Business Events, Commands, Policies, and Actors on a timeline.

Context

When and for what do we use this method?

Input

Which data, observations, decisions, or materials are available?

Execution

Short notes along the runsheet.

Output artifacts

  • Event timeline:
  • Ubiquitous language:
  • Boundaries:
  • Open questions:

Assumptions and open questions

  • ...

Decision / next step

Owner, date, and success signal.

When to choose differently

Short decision aid for existing alternatives.

Example Mapping

Statt EventStorming, wenn du mit konkreten Beispielen Fälle, Regeln und Ausnahmen schneller klären willst.

User Story Mapping

Statt EventStorming, wenn du Abläufe entlang von Nutzerzielen und Liefer-Schnitten strukturieren willst.

Similar methods

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Context Map

Turns domain knowledge, language, and system boundaries into a tangible result by listing contexts, drawing relationships, and clarifying dependencies and conflicts.

Domain Modeling
Domain Context Map

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Bounded Context Canvas

Turns domain knowledge, language, and system boundaries into a tangible result by naming the context, formulating its purpose, and noting ownership and risks.

Knowledge Modeling
Event Modeling

Turns terms, relationships, and rules into a tangible result by selecting a scenario, sketching events, and deriving implementation slices.

Knowledge Modeling
Domain Storytelling

Turns terms, relationships, and rules into a tangible result by choosing a concrete story, identifying actors and work objects, and extracting language and rules.

Knowledge Modeling
Competency Questions

Concrete domain questions define what an ontology or knowledge model must be able to answer and test.