Domain Modeling Workshop method

EventStorming

Makes business flows visible through shared exploration of past domain events.

EventStorming explores complex business flows collaboratively through past domain events. Big Picture creates a shared overview; Process Level uses richer notation to examine a bounded process.

Core question

Which business events, triggers, and boundaries shape the flow, and where do friction, risk, or learning needs arise?

Plan session Method guide

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Participants: 5-12
Time: 2-8 h

EventStorming on a long working surface: colored event cards form a business flow, friction points are marked, and a boundary separates different areas of responsibility.

Frame
Frame the flow and voices
Set a shared slice and the domain perspectives needed to explore it.
Events first
Collect past events
Put the domain story on cards without explaining it too early.
Timeline
Sharpen the timeline and breaks
Explore order, turning points and conflicting perspectives together.
Zoom
Explore friction and boundaries
Prioritize hot spots and choose the next useful modelling zoom.
Follow-up
Capture and continue
Turn snapshots, language and next questions into owned work.

Work in bounded slices and revisit the model as evidence changes. A Big Picture is a map for further questions, not a finished data model.

A good fit when

A good fit when several perspectives on one business flow need to meet and gaps, hand-offs or competing terms need to become discussable.

Ideal for

Complex domains
Cross-functional discovery
Event-driven systems

Not good for

Trivial CRUD processes
Solo documentation
Low-level code design

Outputs

Event Timeline
A shared picture of the business flow with turning points, variants and open questions.
Domain Boundaries
A reasoned boundary hypothesis with prioritized hot spots for the next zoom.

Structure

EventStorming · Big PictureDomain Events, Commands, Actors, Policies, Hot Spots und Context-Grenzen entlang einer Business-Timeline sichtbar machen

First step

Choose an observable business flow with a clear start and end. Invite the people who know decisions and exceptions from practice.

Open the method guide

Where to go next?

Domain Modeling

Bounded Context Canvas

Turns hot spots and boundary hypotheses into a written-up bounded context.

Knowledge Modeling

Domain Storytelling

Deepens one prioritized slice of the timeline as a concretely narrated situation.

Domain Modeling

Context Map

Arranges the resulting domain boundaries into a map of their relationships.

Deep dive

Purpose

When a domain consists of many events, rules, and states, it creates a shared modeling space for the team. It bundles language, flows, and boundaries before domain knowledge fragments into siloed views.

How it works

It arranges events and their relationships on a visible surface and lets contradictions be discussed directly on the model. This produces shared terms, clearer boundaries, and a solid basis for follow-up decisions.

In detail

EventStorming works because it makes business dynamics visible as a sequence of real events, which quickly surfaces hidden assumptions. Good facilitation shows up in terms, turning points, and edge cases being sharpened on the wall, rather than just sorting colored sticky notes. The real insight for the model, language, and later cuts emerges as soon as several viewpoints on the same situation appear.

Facilitation

Prepare a few real business cases that cause friction, exceptions, or escalations in daily work, and start with a case everyone recognizes without explanation. The turning point appears exactly where terms collide or responsibilities shift. Capture that moment and close with clearly named open modeling questions or candidates for bounded contexts.

The method guide walks execution through 5 phases, timing, 5 pitfalls, and clear stop criteria.

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Sources and topics

Topics

Domain-Driven Design Events Discovery Workshop

Sources

EventStormingeventstorming.comeventstorming.com by Alberto Brandolini, the method's creator; introduces the four styles Improve, Envision, Explore and Design.EventStorming | Avanscopertaavanscoperta.itAvanscoperta, Alberto Brandolini's training provider; describes Big Picture, Process Modelling and Software Design EventStorming.

In playbooks

Lead Domain Discovery to BoundariesMove from domain flow to language, events, bounded contexts, and first architecture boundaries.

Artifact templates

EventStorming: WorksheetPrepare a selected step or the complete flow. Your ready-to-use plan takes shape on the right.

markdown

event-storming-working-template.md

Prepare a selected step or the complete flow. Your ready-to-use plan takes shape on the right.

EventStorming: Worksheet

Question

To be confirmed

Desired outcome

To be confirmed

Scope

Entire workshop Time: Allow 2 hours or more for a focused slice; schedule Process-Level depth separately.

Complete this worksheet on paper or in your own document during the work.

Preparation for this scope

Method setup

Materials: Large wall or digital board with at least 8 m of horizontal space; orange sticky notes (Events), blue (Commands), yellow (Actors), pink (Hot Spots), purple (Policies), green (Read Models); markers; camera for snapshots; parking-lot area.
Roles: A facilitator with EventStorming experience; three to six domain experts from business; two to four engineers or architects; one scribe for hot spots and open questions.
Advance information: Gather an example story, known domain terms, relevant edge cases and existing process notes as conversation prompts. The notes start the conversation; they do not replace shared storytelling.
Overall time needed: 2-8 h
Setup: Prepare a large open wall or board, a visible legend, markers, event and hot-spot cards, and a parking lot for solutions. In Big Picture, introduce only the notation needed for the flow; justify a Process-Level zoom separately.