A read model is the view of data within the domain that the actor uses to make a decision to execute a command. This can be one of the system’s screens, a report, a notification, and so on.

The read models are represented by green sticky notes (see the “Shopping cart” note in Figure 12-8) with a short description of the source of information needed to sup‐ port the actor’s decision. Since a command is executed after the actor has viewed the read model, on the modeling surface the read models are positioned before the commands.

Figure 12-8. The view of the “Shopping cart” (read model) needed for the customer (actor) to make their decision to submit the order (command)