Data flow diagram (DFD Diagram: Flow Data)
Data Flow Diagram is a tool of the system that allows analysts to better understand the working procedures of each organization, which indicates the receiving/sending data. Coordination between the various activities in the operation, which is a model of the system. Represents the flow of data INPUT and OUTPUT between the origin and destination of packets, which may be individual or Department to another system, depending on the system and work coordination within the system. It also helps to know the requirements and defects (problems) in the same system to be used in designing the new system in operation.