i nead (Use Case Diagram).

for this example that have this information:

DFD Example: Bus Garage Repairs . Buses come to a garage for repairs. A mechanic and helper perform the repair, record the reason for the repair and record the total cost of all parts used on a Shop Repair Order. Information on labor, parts and repair outcome is used for billing by the Accounting Department, parts monitoring by the inventory management computer system and a performance review by the supervisor. . DFD Example: Bus Garage Repairs (cont'd) Data stores: - - Personnel file - Repairs file Bus master list Parts list Data flows: Repair order Bus record Parts record Employee timecard - Invoices - - - DFD Example: Bus Garage Repairs (cont'd) External Entities: Bus, Mechanic, Helper, Supervisor, Inventory Management System, Accounting Department, etc. Key process (the system): performing repairs and storing information related to repairs Processes: Record Bus ID and reason for repair Determine parts needed - Perform repair Calculate parts extended and total cost Record labor hours, cost - - - - Bus Garage Context Diagram Bus Mechanical problem to be repaired Fixed mechanical problems Supervisor Helper Labor Repair summary Bus Repair Process System Xist of parts used Labor Inventory Management System Labor, parts cost details Mechanic Accounting