System Analysis and Design - Old Questions

2.  Draw a DFD diagram of following up to level 2.

Customer sends enquiry to commercial department, receives quotations from the sales department and places an order. Based on the customer order, the work order is sent to the planning department for planning scheduling and control, in turn, the planning department raises a job order on the "shop floor". On completion, delivery note and invoice are made out costing department also prepares an orderwise comparative statement of estimated and actual costs.