methodatlas
Method guideKnowledge Modeling

Event Modeling

A practical method guide: clarify prerequisites and materials, understand the complete process, and look up outputs, pitfalls, and stop criteria.

ComplexityMedium
Time2-6 h
Participants2-8
FormatWorkshop + async
MaturityEstablished
Plan Event Modeling
01

Prerequisite

What needs to be finished first

Complete firstClear scope

Agree the subject, boundary and decision before filling the model.

A broad or mixed scope produces a misleading model.
Complete firstAccess to relevant evidence

Bring source material and people who know the work; distinguish facts from assumptions.

Unverified interpretations become false certainty.
02

Preparation

What needs to be ready before start

Materials

Shared visual workspace, source evidence, and an agreed decision question.

People / roles

Facilitator, domain experts, product, developers, architect.

Pre-read

Collect existing data, examples, constraints and relevant stakeholder perspectives.

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.

03

Core question

The one question this method answers

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

04

Flow

Phases with goal, actions, output and pitfall

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

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
ScenarioTimeline pointCommandEventView
Scenario 1Record an observation or example for this row.After slot selectionBook appointmentAppointment confirmedUpcoming appointments

  1. 1. Timeline point

    Scenario 1
    After slot selection

  2. 2. Command

    Scenario 1
    Book appointment

  3. 3. Event

    Scenario 1
    Appointment confirmed

  4. 4. View

    Scenario 1
    Upcoming appointments

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 Modeling

  1. 1

    Scenario

    Set scenario and outcome

    Goal

    Scenario with clear end states

    Inputs for this step

    • User goal, system boundary and initial state

    Actions

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

    Output

    Scenario with clear end states

    Scenario with clear end states

    Quality check

    Are start and result meaningful to the domain?

    Pitfall

    The model combines unrelated flows. Split into scenarios with distinct outcomes.

    Timing: Allow time according to scope and evidence; no universal duration.

  2. 2

    Events

    Place events on timeline

    Goal

    Event timeline

    Inputs for this step

    • Domain changes and actors

    Actions

    • Write events as facts that happened and order them; distinguish state changes from transient UI actions.

    Output

    Event timeline

    Event timeline

    Quality check

    Does each event change domain information?

    Pitfall

    Commands or screens are labelled as events. Rewrite each as a completed state change.

    Timing: Allow time according to scope and evidence; no universal duration.

  3. 3

    Commands

    Add commands and views

    Goal

    Command/event/view model

    Inputs for this step

    • Timeline, user intent and required screens

    Actions

    • Connect commands to actors and intent, and views to the information users see at that moment.

    Output

    Command/event/view model

    Command/event/view model

    Quality check

    Can each view be explained by prior events?

    Pitfall

    Read model and interface are disconnected from events. Show which events update each view.

    Timing: Allow time according to scope and evidence; no universal duration.

  4. 4

    Variants

    Check variants and information flow

    Goal

    Testable slices and open questions

    Inputs for this step

    • Happy path, rejections, concurrency and rules

    Actions

    • Walk the flow step by step, add domain-relevant alternatives and trace information to the outcome; label unresolved rules.

    Output

    Testable slices and open questions

    Testable slices and open questions

    Quality check

    Are conflict and rejection paths present?

    Pitfall

    Only the ideal path is implemented. Model one concrete rejection and its user-visible result.

    Timing: Allow time according to scope and evidence; no universal duration.

05

Artifact

What comes out at the end

Sketch: what the artifact looks like

Event Modeling · System BlueprintConnect user intent, commands, events, read models, and views into implementable slices
Event ModelingThe visual shows a system blueprint with user intent, commands, events, read models, views, and vertical implementation slices.Model system behavior as an end-to-end blueprintVertical slices connect intent, command, event, read model, and view into an implementable flow.Slice 1Slice 2Slice 3Slice 4User IntentCapture requestChoose optionStart serviceSee statusCommandCreate RequestSelect PlanActivate ServiceCheck StatusEventRequest CreatedPlan SelectedService ActivatedStatus CheckedRead ModelRequest ListPlan SummaryService StateStatus LogView / APIFormDecision UIActivation APIDashboardnext eventconsequencefeedback
Form

Connects commands, information-changing events and user-visible views along a system timeline. Record scope, evidence, assumptions, owner and next review in the versioned artifact.

Versioning / ownership

Record scope, date, participants, source version and owner. Note changed assumptions and the reason for each revision.

Tool alternatives
  • Shared whiteboard or paper template
  • Source links, records or measurement data

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.

Prepare for the work steps

Scenario: Set scenario and outcome

  • User goal, system boundary and initial state

Events: Place events on timeline

  • Domain changes and actors

Commands: Add commands and views

  • Timeline, user intent and required screens

Variants: Check variants and information flow

  • Happy path, rejections, concurrency and rules

Event model: information flow

ScenarioTimeline pointCommandEventView
Scenario 1
  • Scenario 1: Record an observation or example for this row.

Events state information changes; commands express intent; views show information to users.

Event Modeling

Scenario: Set scenario and outcome

Expected artifact: Scenario with clear end states

Scenario with clear end states

Entry:

...

  • Are start and result meaningful to the domain?

Events: Place events on timeline

Expected artifact: Event timeline

Event timeline

Entry:

...

  • Does each event change domain information?

Commands: Add commands and views

Expected artifact: Command/event/view model

Command/event/view model

Entry:

...

  • Can each view be explained by prior events?

Variants: Check variants and information flow

Expected artifact: Testable slices and open questions

Testable slices and open questions

Entry:

...

  • Are conflict and rejection paths present?

Open questions and next steps

...

Method guide: https://methodatlas.meierhoff-systems.de/en/methods/event-modeling/run-sheet

06

Example output

Concrete filled scenario, fictional example

Fictional example for orientation. Counts and timings describe this case and are not universal requirements.

event-modeling-beispiel.md

Concrete filled scenario, fictional 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.

07

Pitfalls

Recognize symptoms and steer against them

Quick overview, the full text is in the matching phase in the flow

  1. Set scenario and outcomeThe model combines unrelated flows.View in phase
  2. Place events on timelineCommands or screens are labelled as events.View in phase
  3. Add commands and viewsRead model and interface are disconnected from events.View in phase
  4. Check variants and information flowOnly the ideal path is implemented.View in phase
08

Stop criteria

When to pause, resolve prerequisites, or choose another approach

Stop if the decision question or scope is disputed; align it first.
Stop if key inputs are unavailable; list what evidence is needed.
Stop if the group treats assumptions as observed facts.

Method after Adam Dymitruk. Curated with 1 sources.

Sources: Event Modeling

Flow, timeboxes, and pitfalls are editorially curated practice recommendations based on the listed sources.

Where to go next?

A paper-based illustration representing C4 Model with its core stages and visible working result.
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.

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