Display by Calls also has an important effect on how scheduling is done. When this field is set to Yes, availability can be based on the number of calls that can still be assigned to an engineer during a day rather than the hours available or unconsumed. This is a reasonable alternative in environments where calls typically do not vary much in duration.

If you set Display by Calls to Yes, you also need to specify the number of calls per day that can be assigned to an engineer in Engineer Maintenance. Availability is then calculated by subtracting the number of calls already scheduled from the Calls per Day value defined for the engineer.

Depending on how the control is set up, the scheduling pop-up window in Call Maintenance shows the number of calls that can still be assigned to an engineer or the number of hours available.