Definition Related to DFD
A Data Flow Diagram is a network model of an information processing system. The arcs of the network represent data flows, and the nodes represent data stores, transforms, or selected elements of the environment. A Data Flow is a movement of information within the system or across the system boundary. A data flow which crosses the system boundary to enter the system is called a net system input or simply System Input . A data flow which crosses the boundary to leave the system is called a net system output or System Output . A Data Store is a time-delayed repository of information, where data is kept temporarily or permanently, avoid thinking of them in computer "file" terms, there are many quite different forms. A Process , or Transform , is a transformation that inputs one type of data and outputs a different type. It is a conversion of data from one form to another. A process cannot output data without ge...