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In the following proposed DFD design, there are some typical errors among external entities (E), processes (P) and data stores (DS). Identify and explain any errors in the following design.
Question 1:
An Automobile Repair Shop System
An automobile garage is a repair shop where automobiles are repaired by auto mechanics. When automobiles come to a garage for repairs, an auto mechanic performs the repair, records the reason for the repair and record the total cost of all parts used on a repair order. This auto repair shop also provides towing services thru the ABC Auto Towing Service. Information on labor, parts and repair results is forwarded to the Accounting Department for billing. The selection and availability of auto parts are controlled and monitored by the Inventory Management Computer System. Finally, a repair summary is submitted to the shop supervisor for approval before repairing.
1. Draw a context-level diagram for the Automobile Repair Shop System. Please make sure to include reasonable data flows for the diagram.
2. For the level-0 diagram, please list necessary processes and data stores for the Automobile Repair Shop System. Note that there is no need to draw this level-0 diagram.
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