How would you know if a Provider is "gaming the system", resulting in a schedule where the "odds are forever in their favor?"
How can you guarantee objectivity, fairness and transparency in your on-call schedules?
In the past, paper calendars and excel documents made "gaming" difficult to detect. Auditing was inaccurate and time consuming, since schedules were generally created by hand from scratch each time, requests came in via notes or phone, and tallies could be miss counted.
Using on-line scheduling software improves the situation, but you may need to take more preventive action.