How is the performer of an action indicated on a BPMN diagram?

In BPMN, the performer of an action is usually indicated using Pools and Lanes.

• Pool represents the main participant in the process — an organization or system.
• Lane within a pool indicates a specific performer or role (e.g., department, employee, system).

Tasks are placed within the respective lanes, visually showing who is responsible for executing a particular action.

Example: if a task is in the "Sales Department" lane, then this department is the performer.

Annotations or task attributes can also be used to specify the performer, but the primary and standard method is to use pools and lanes.