To create the DFD, we need to identify the essence of the inventory system Bob has established.What are the key data necessary to keep track of inventory and pay bills? What are the keyprocesses involved? At least four key processes make up Hoosier Burger's inventory system: (1)account for anything added to inventory, (2) account for anything taken from inventory, (3) placeorders, and (4) pay bills. Key data used by the system include inventories and stock-on-handcounts, however they are determined. Major outputs from the system continue to be orders andpayments. If we focus on the essential elements of the system, we obtain the context diagram andthe level-0 DFD