This illustration shows the Travel Request Process, which contains the following: 

Three equal horizontal regions called swimlanes. Displayed top to bottom, the three swimlanes are: Employee, Manager, and Supervisor.

Each swimlane contains flow elements (left to right) and sequence flows.

The process starts at the left end of the Employee swimlane with the Submit Travel Request start event.

There is a sequence flow from Submit Travel Request to the Amount > 5000 exclusive gateway in the Manager swimlane.

From Amount > 5000 the sequence flow points to the Review by Supervisor approve human task in the Supervisor swimlane.

From there the sequence flow points to the Supervisor Approved? exclusive gateway in the same lane.

There are two sequence flows coming out of Supervisor Approved?.

One sequence flow points to the Approve Travel Request approve human task in the Manager swimlane.

The other sequence flow points to the Redo Travel Request submit human task in the Employee swimlane.

The Approve Travel Request task has a sequence flow pointing to the Approved? exclusive gateway in the Manager swimlane.

The Approved? gateway has two sequence flows. The No sequence flow points to the Redo Travel Request task.

The Redo Travel Request task has a sequence flow pointing to the Approve Travel Request task.

The Yes sequence flow points to the Fulfill Travel Request submit human task.

The Fulfill Travel Request task has a sequence flow that points to the Completed end event which signifies the end of the process.