Which of the following best describes "swim-lanes" in a business process model?

"Swim-lanes" in a business process model are a visual tool that delineates different roles and responsibilities within a process. They help clarify who does what by organizing the actions of multiple participants (such as departments or individual roles) into horizontal or vertical "lanes" in a flowchart. Each lane represents a specific actor or group involved in the process, making it easier to identify interactions and handoffs between them.

This structure enhances the understanding of a process by showing the flow of activities alongside the individuals or teams responsible for completing each part. It also aids in evaluating efficiency and communication within the process, highlighting areas where coordination may be lacking.

The other options focus on aspects that do not encapsulate the unique function of swim-lanes. While divisions of departments relate to organizational structure, the sequence of activities points to process timelines, and types of metrics concern performance indicators—all of which do not address the specific visualization of roles and responsibilities that swim-lanes provide.