Knowledge Modeling Mapping tool

Event Modeling

Connects commands, information-changing events and user-visible views along a system timeline.

Core question

Which events, commands, and views explain the system behavior over time?

Plan Event Modeling Method guide

Start comparison

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Participants: 2-8
Time: 2-6 h

The steps are a practical sequence; adapt them to the method’s purpose and available evidence.

A paper-based illustration representing Event Modeling with its core stages and visible working result.

Scenario
Set scenario and outcome
Choose a valuable use case and describe observable success and rejection outcomes.
Events
Place events on timeline
Write events as facts that happened and order them; distinguish state changes from transient UI actions.
Commands
Add commands and views
Connect commands to actors and intent, and views to the information users see at that moment.
Variants
Check variants and information flow
Walk the flow step by step, add domain-relevant alternatives and trace information to the outcome; label unresolved rules.

Revisit the model when evidence, context or outcomes change. Record what changed and why.

A good fit when

Use it when: Event-driven Systems, Vertical Slicing. The group can provide the evidence and authority the method requires.

Ideal for

Event-driven systems
Vertical slicing
Behavior-first design

Not good for

Pure infrastructure design
Simple CRUD apps

Outputs

Event model
Information flow over time with commands, events, views and domain variants.
Testable slices and open questions
The artifact records scope, date, participants, source version, and owner, including changed assumptions and the reason for each revision.

Event model: information flow

Fictional worked example

Fictional appointment timeline: user sees available slots → command “Book appointment” → event “Appointment requested” → conflict check → event “Appointment confirmed” or “Booking rejected” → confirmation view. Read view: upcoming appointments. Exception: practice removes slot offline at the same time. This calls for an explicit conflict rule; it does not predetermine infrastructure.

Event model: information flow
Scenario	Timeline point	Command	Event	View
Scenario 1Record an observation or example for this row.	After slot selection	Book appointment	Appointment confirmed	Upcoming appointments

1. Timeline point
Scenario 1
After slot selection
2. Command
Scenario 1
Book appointment
3. Event
Scenario 1
Appointment confirmed
4. View
Scenario 1
Upcoming appointments

Event Modeling

First step

Choose a valuable use case and describe observable success and rejection outcomes.

Open the method guide

Good to do first

Domain Modeling

EventStorming

Supplies the rough event timeline that Event Modeling refines into slices.

Knowledge Modeling

Domain Storytelling

Supplies the narrated situation from which events and views are derived.

Where to go next?

Architecture

C4 Model

Translates the validated slices into containers and components for implementation.

Paper illustration of two considered options leading to a decision record with a marked status and visible consequences.

Architecture

Architecture Decision Record

Records open rule decisions from the model as an architecture decision.

Deep dive

Purpose

Event Modeling connects business workflows with commands, events, and views into one coherent mental model. It helps design behavior, UI, and technical slices from the same underlying logic.

How it works

The team picks a scenario and sketches the relevant events along the timeline. It then adds commands, read models, and UI reactions until the flow is fully legible. The result is clear implementation cuts and a shared picture of system behavior.

In detail

Event Modeling works because it brings business events, triggers, and visible consequences into one shared picture of behavior. Its quality increases when real scenarios with edge cases are used and commands, events, views, and automations are treated as a connected response. Purely mechanical arranging of cards only produces sequences; the method becomes solid through precise cuts that clarify implementation, data storage, and UI at the same time.

Facilitation

Start with a continuous business case and keep everyone on the same timeline so no one veers off into isolated solutions. It gets interesting where several reactions follow the same event or a step silently contains assumptions about state. End the session with clearly named bounded areas, unresolved state questions, and a decision on the first implementation cut.

The method guide walks execution through 4 phases, timing, 4 pitfalls, and clear stop criteria.

Open method guide

Your perspective

Does this method help with your work?

Your feedback helps shape the next improvements to methodatlas.

Sources and topics

Topics

Events Blueprint Domain-Driven Design Behavior

Sources

Event Modelingeventmodeling.orgeventmodeling.org by Adam Dymitruk (Adaptech Group); describes event modeling for depicting how information changes over time.

Artifact templates

Event Modeling: WorksheetPrepare the decision, source evidence and next review.

markdown

event-modeling-working-template.md

Prepare the decision, source evidence and next review.

Event Modeling: Worksheet

Question

To be confirmed

Desired outcome

To be confirmed

Scope

Run the method Time: See catalog planning range; no universal duration.

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

Preparation for this scope

Method setup

Materials: Shared visual workspace, source evidence, and an agreed decision question.
Roles: Facilitator, domain experts, product, developers, architect.
Advance information: Collect existing data, examples, constraints and relevant stakeholder perspectives.
Overall time needed: 2–4 h for one bounded flow; split larger processes into separate sessions.
Setup: Choose one valuable scenario, starting state and outcome. Arrange information-changing domain events chronologically; keep transient UI actions distinct. Connect commands that request changes with events and views that display state. Walk through success, rejection, concurrency and relevant exception paths. Check every user-visible outcome is supported by information flow; identify coherent slices.