Scheduling Criteria are broadly defined as any aspect or attribute of the employee that makes them more suitable than others, for a certain time slot. This could be related to the location of the work, the skills or qualifications of the worker, leadership qualities, etc.
To set an employee's scheduling criteria, click the Scheduling Criteria button at the bottom of the Employees window.
On the left of the screen is a list of all available Scheduling Criteria. On the right are the criteria already associated with this employee.
To assign criteria to an employee, select one and click the 
To remove criteria from an employee, select one and click the 
You can also drag and drop criteria from one window to the other.
Once you have finished assigning criteria, click Save or press F10 to return to the Employees screen.