On the image below you find the general workflow scheme for the On Demand Work application.
Every 'blue block' in the scheme can be an SLA defined rule to select one of the visualized flows in the block. By selecting a flow in every blue block you get a walkthrough of the SLA defined workflow.
Note: This is the standard workflow; additional steps can be defined
People who have to perform a task, for example give an approval or update a work request, are assigned directly or by a Service Desk role, visualized as follows: