The other field values then need to be entered to enable the calculations. The number of good parts is the total part count. The number of scrapped parts comes from the timer we just set up. In this case we are using the 'Stopped' timer to record the unplanned downtime and the 'Maintenance' timer to record planned downtime. If we leave the Planned Production Time blank it will use the shift pattern entered in the schedule setup to calculate this figure.