How does a use case report differ from a Data Flow Diagram?
Ans. Data Flow Diagram : A data flow diagram is a graphic representation of a system or portion of system. It consists of data flows, processes, sources, destinations, and stores – all described through the use of easily understood symbols. An entire system can be described from the viewpoint of the data it processes with only four symbol. At the same time, data flow diagrams are powerful enough to show parallel activities. When standard symbols limit communication, a presentation graph, which uses symbols of people, files, terminals, and documents, can be used to discuss a system with users. A data flow diagram are of two types : · Physical Data flow diagrams · Logical data flow diagrams. Physical data flow diagrams are implementation-dependent. They show the actual devices, department, people, etc., involved in the current system. Logical data flow diagrams, in contrast, describe the system independently of how it is actually implemented; that is, they show what takes place, rather t
