Supervisors in this unit group supervise and co-ordinate the activities of workers in the following unit groups: Shippers and Receivers (1521), Storekeepers and Partspersons (1522), Production Logistics Co-ordinators (1523), Purchasing and Inventory Control Workers (1524), Dispatchers (1525) and Transportation Route and Crew Schedulers (1526). They are employed throughout the public and private sectors.