Determine the boundaries and scope of the system

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Data Flow Diagram (DFD) is a commonly used system Email List analysis tool to describe the flow and processing of data in a system. It graphically displays the input, output, processing, and data storage in the system. Let's take a simple online shopping system as an example to illustrate the process of drawing a data flow graph:


1. Determine the boundaries and scope of the system
First, we need to define the problem that this online shopping system is going to solve. In this example, the main functions of the system are users browsing products, placing orders, paying, and checking order status. Based on the system functionality, we can identify the following main processes:Browsing products: Users search for products and view product details. Add to Cart: User adds an item to the shopping cart. Place an order: The user submits an order. Payment: The user selects a payment method and completes the payment. View Order: User views order status.