Operations are the instructions or tasks to perform a repair. Every operation is assigned to a department, associated with assigned resources (trades people, contractor services, and equipment). When you enter a Work Order for a Maintained Number, the Maintained Number’s associated Activity attaches to the Work Order, delivering its related maintenance route  and BOM. The maintenance route is comprised of operations necessary in completing the Activity. You can Complete and Uncomplete operations. After an operation is complete, you can perform an Operation Uncompletion. However, if an operation is dependent upon another operation, you cannot uncomplete that operation’s dependency if the current operation is complete. For example, operation 20 is dependent on operation 10 completing. You cannot uncomplete operation 10 after operation 20 has been completed.