This Sales data flow diagram level is a diagram that depicts the project's overall data management. It has three main levels that show how to handle sales and inventory data: DFD Levels 0, 1, and 2. These DFD levels demonstrate the Sales and Inventory data management concept from the fundamentals to specifics. This sales data flow diagram level represents the data flow and transformations in the Sales and Inventory System. As data enters and exits a system, these transformations take place. Input, processing, and output are generally used to represent and define the overall system in the DFD.
