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"Data flow diagrams are one of the three essential perspectives of the structured-systems analysis and design method SSADM. The sponsor of a project and the end users will need to be briefed and consulted throughout all stages of a system's evolution. With a data flow diagram, users are able to visualize how the system will operate, what the system will accomplish, and how the system will be implemented. The old system's dataflow diagrams can be drawn up and compared with the new system's data flow diagrams to draw comparisons to implement a more efficient system. Data flow diagrams can be used to provide the end user with a physical idea of where the data they input ultimately has an effect upon the structure of the whole system from order to dispatch to report. How any system is developed can be determined through a data flow diagram model.
In the course of developing a set of levelled data flow diagrams the analyst/ designers is forced to address how the system may be decomposed into component sub-systems, and to identify the transaction data in the data model.
Data flow diagrams can be used in both Analysis and Design phase of the SDLC.
There are different notations to draw data flow diagrams (Yourdon & Coad and Gane & Sarson), defining different visual representations for processes, data stores, data flow, and external entities." [Data flow diagram. Wikipedia]
The DFD (Yourdon and Coad notation) example "Process of account receivable" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park.
Data Flow Diagram
Data Flow Diagram, process, external interactor, data store,
Used Solutions

data flow diagram, DFD templates Data Flow Diagrams (DFD)

data flow diagram, DFD templates
Data Flow Diagrams solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for drawing the data flow diagrams (DFD).
HelpDesk

How to Create a Data Flow Diagram using ConceptDraw PRO

ConceptDraw Data Flow diagram (DFD) example
Data flow diagramming is a highly effective technique for showing the flow of information through a system. Data flow diagrams reveal relationships among and between the various components in a program or system. DFD is an important technique for modeling a system’s high-level detail by showing how input data is transformed to output results through a sequence of functional transformations. The set of standard symbols is used to depict how these components interact in a system. ConceptDraw PRO allows you to draw a simple and clear Data Flow Diagram using special libraries.
HelpDesk

Accounting Information Systems Flowchart Symbols

What are Information Systems Flowchart Symbols
Accounting Information system is a combination of software and hardware, as well as organizational support. Information system - it is not only the software and computers with network equipment, but also a list of instructions and standards which can be notated using Accounting information systems flowchart symbols. All information systems can be divided into information retrieval and data processing systems. Data Flow model is a hierarchical model. Each process can be divided into structural components, that depict by corresponding flowchart symbols, showing the accounting information system in communication with the external environment. The major components of accounting information systems flowchart are: entities, processes, data stores, and data flows. The set of standard accounting information flowchart symbols is intended to show the relationships between the system components. ConceptDraw PRO can help to draw clear accounting information system diagrams using special flowchart symbols.