A published record of some business-significant event that has occurred.
Relevant for domain experts
Verb at past tense
Notation
Orange sticky note
Event Storming
Crédits
Introduction
Participants
Organisation
Online Tools
Domain Events
Unstructured Exploration
Timeline Organisation
Hotspot
A painful spot, bottleneck, or hotspot that occurs during the event timeline.
Notation
Dark purple sticky note, 45° turned
Hotspots/Pains Placement
Command
A request on the behalf on an actor to initiate some business process.
Notation
Blue sticky note
Command Placement
Commands are placed before events
Actor
A user persona within the domain that requests a command to be executed.
Actors trigger Commands
Policy
A statement that when one or more specific Domain Events occur, something else should happen.
Notation
Purple sticky note
Policies
Read Model
A view of the data captured within the domain that an Actor uses to gather information necessary to make a decision.
Notation
Green sticky note
Actors read the Model
External System
A system that exists outside of the modeled domain that collaborates with the domain being modeled.
Notation
Pink Rectangle Sticky
External Systems send Events
Aggregate
A transactionally-consistent group of entities that maintains business invariants. Commands are executed on Aggregates, and they publish Domain Events.
Notation
Yellow sticky note
Aggregate Placement
Bounded Contexts Definitions
