DFD of Existing System Sample Clauses

DFD of Existing System. A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects. Often they are a preliminary step used to create an overview of the system which can later be elaborated. DFDs can also be used for the visualization of data processing (structured design). A DFD shows what kinds of data will be input to and output from the system, where the data will come from and go to, and where the data will be stored. It does not show information about the timing of processes, or information about whether processes will operate in sequence or in parallel (which is shown on a flowchart). So, before we have to design any system we have to know about existing system first. Hence, here is represented existing DFD on two aspects 1. Context level DFD and 2. System Level DFD (Zero Level DFD) as follows