Data Flow Diagram Symbols. DFD Library

Data Flow Diagram


Data Flow Diagrams show information transfers and process steps of a system. The general concept is an approach of a depicting how occurs input in a system, further processes and what runs out. The aim of DFD is in accomplishing of understanding between developers and users. Data flow diagrams are maintained with other methods of structured systems analysis.

A data flow diagram (DFD) illustrates how data is processed by a system in terms of inputs and outputs. As its name indicates its focus is on the flow of information, where data comes from, where it goes and how it gets stored.

  • Graphical representation of the "flow" of data through an information system;
  • Modeling process aspects;
  • An overview of the system;
  • For the visualization of data processing (structured design);
  • What kinds of information will be input to and output from the system;
  • Where the data will come from and go to;
  • Where the data will be stored.

Data Flow Diagram (DFD) notations


The Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park provides three vector stencils libraries for drawing DFD using the ConceptDraw PRO diagramming and vector drawing software.

The design elements library Data flow diagram (DFD) contains 15 data flow diagram symbols for drawing both context-level data flow diagram and Level 1 DFD.

The design elements library DFD, Gane-Sarson notation contains 12 data flow diagram symbols of Gane-Sarson DFD notation.

The design elements library DFD, Yourdon and Coad notation contains 22 data flow diagram symbols of Yourdon/DeMarco DFD notation.

Use these DFD symbol libraries to design the process-oriented models, data-oriented models, data flowcharts, data process diagrams, structured analysis diagrams, and information flow diagrams.

Data Flow Diagram Symbols

Pic 1. Data Flow Diagram Symbols. DFD Library

If you want to structure the huge amount of information, then you definitely need to put your data in order with help of a data flow diagram or “bubble chart” as it can also be called.

Data flow diagram, or DFD, is a special tool which is widely used in systems designing activity. DFDs can be the context-level DFDs or Level 1 DFDs showing the details of the system, which is currently being modelled.

The Level 1 data flow diagram shows in what way some system is divided into sub-systems, illustrating the processes which take place within this system. Each of these processes is connected with one data flow or mane different data flows.

These data flows are represented in the connection with the external agent and they provide all of the system functionality, representing it as a whole. Such type of diagram identifies the internal data stores, which are meant to be presented in order for the system to function, and it shows the flow of data among the different parts of one system.

Creating such data flow diagram, you have to take into consideration the SSADM design method and the structured-systems analysis. The investor, involved in a project, as well as the end users, will need to be consulted on every single stage of some particular system's evolution.

Using a data flow diagram, means being able to visualize the way how some system can operate, what this system will accomplish and how it will be implemented. Such diagrams can be also used to provide the end user with a physical idea of where the data they input has an effect on the whole system and so to be able to report about it later. Creating a data flow diagram model means representing the way, in what some system can be developed and so it can be determined. While creating such data flow diagram, the analyst or the designer addresses the way some system may be decomposed into its components (sub-systems), and he identifies the data transaction in some data model. Data flow diagrams are very widely used in the Analysis phase and the Design phase in the SDLC.

You can use different notations in order to draw data flow diagrams, such as Yourdon and Coad; and Gane and Sarson notations. You can define different visual representations for data flow, processes, data stores and external entities of a system while creating a data flow diagram. To be able to make one of the described above diagrams, you can also try to make it from a scratch, creating all of the constitutes yourself. But it can be a hard job and it can take lots of your time, especially if you do not really know how to make them.

Having not as much experience in making the design elements which should be the constitutes of your data flow diagram and not knowing what to start with and which software to use to be able to make a great and professionally looking DFD is not a problem. As we can recommend you to use a truly unique and very convenient software, which is ConceptDraw PRO one, that can help you to make any diagram you want, including the data flow one, in only a couple of hours or even minutes.

Sounds interesting? Yes, once you download ConceptDraw PRO and so the appropriate solutions which consists of the needed design symbols in the stencil libraries and so the examples of pre-made diagrams, you will be able to make your own DFD using the existing template during only a couple of hours. If you already have some experience of using ConceptDraw PRO software, then it can take you even less time as you must already know where to get the solutions from and how to use what they consist of.

Illustrating the way how data is being processed within some system in terms of its inputs and outputs in a way of DFD is very convenient. You can always mention on the flow of information where this data comes from, where it goes to as well as the way it gets stored.

You can graphically represent the "flow" of data through some information system, model the process aspects, create an overview of some particular system, visualize the data processing in a way of a structured design, mention the kinds of information which is being input into and output from some system as well as where the data comes from and goes to, where it is stored in a way of a data flow diagram.

Making such diagram with help of Data Flow Diagrams solution, which can be found in the Software Development area of ConceptDraw Solution Park or in ConceptDraw STORE, is always very simple and the process of creating such diagram will appear to be fun and entertaining. This solution provides three vector stencil libraries developed especially for drawing the DFDs using ConceptDraw PRO diagramming and vector drawing software.

The design elements library Data flow diagram (DFD) contains 15 data flow diagram symbols for drawing both context-level data flow diagram and Level 1 DFDs; the design elements library DFD, Gane-Sarson notation contains 12 data flow diagram symbols of Gane-Sarson DFD notation and the design elements library DFD, Yourdon and Coad notation contains 22 data flow diagram symbols of Yourdon/DeMarco DFD notation.

Data flow diagram library contains the design symbols which represent the State, Start State, Stop State, External Interactor, Entity Relationship, Oval Process, Object, Entity, Entity (in rounded corners), Entity with ID and Location Mention (rounded corners), Data Store, Data Store (with ID) and other elements.

Gane-Sarson DFD library includes the design symbols, which represent External Entity, Process, Process (with Location), Data Store, Jump, Angled Corners, Top to Bottom Variable Connector, Bottom to Side Connetor, Side to Side Connector, Side to Same Side Connector, Top to Top Side Connector, etc. Yourdon and Coad DFD library includes the design symbols, which represent Class and Object, Class, State, Generalization and specialization structure, Whole-part structure, Condition, Loop, External interactor, Data process, Multiple process, State, Multi-State, Stop State, Process, Process (offset), Center to center flow movement, Loop on center, Data store, Instance, Message and others. Use these DFD design symbol libraries for designing the process-oriented models, data-oriented models, data flowcharts, data process diagrams, structured analysis diagrams and information flow diagrams.

Data Flow Diagram Symbols. DFD Library

Pic 2. Data Flow Diagram Software (macOS, Microsoft Windows)

No other Data Flow Diagram software gives you all this:

  • Design and document using a wide range of pre-drawn data flow diagram symbols and smart connectors.
  • Great value for the money, only $199 dollars.
  • Free technology support.
  • Free examples and built-in templates to help you draw data flow diagram rapidly.

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Example of DFD for Online Store (Data Flow Diagram)DFD Example

Structured-systems analysis and design method uses data flow diagrams to represent the process of data flowing through a system. Talking about this might be useless without a proper example of DFD for online store (Data Flow Diagram). This DFD example shows all the distinctness that a diagram can bring into a scattered data structure. Data flow diagrams are used to show how data is processed within some business processes. Making DFD is a common practice for business process modeling and analysis. This diagram represents the online store business flow. It describes inputs and outputs within online selling process and depicts the interactions between its participants. This DF diagram can be used by system analysts to create an overview of a business, to study and discover its inherent strengths and weak points.Online Store Data Flow Diagram
Picture: Example of DFD for Online Store (Data Flow Diagram)DFD Example
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IDEF3 Standard

Use Case Diagrams technology. IDEF3 Standard is intended for description and further analysis of technological processes of an enterprise. Using IDEF3 standard it is possible to examine and model scenarios of technological processes.IDEF3 OSTN diagram example
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Data Flow Diagram

There are many ways to define the flow of information within a system. Structured-systems analysis method often uses data flow diagrams to show data flow, data storages and data processing visualization. These diagrams are easy to develop and quite useful. Here is a dataflow diagram presenting an example of the manufacturing process flow. The oval process shapes represent a process that controls data within the current system. The process may produce data or make some action based on data. Data flows are represented by lines. They show the movement of information through the system. The direction of the data flow is depicted by the arrow. The external entities are shown by rectangles. They represent the external entities interacting with the system. The data store objects (unclosed rectangles) are used to show data bases participating in a process flow.Data Flow Diagram
Picture: Data Flow Diagram
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DFD Library System

The diagrams with highest level in the hierarchy define the main processes or subsystems with external and internal data sources. To detail them, DFD Library is used to build a system of lower level diagrams. This decomposition continues hereinafter it is meaningless.DFD Library System
Picture: DFD Library System
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Data Flow Diagram (DFD)

In software engineering, it is important to understand how the system would cooperate with external sources, like data sources. To give this information a visual representation, data flow diagrams (DFD) were used for years. The entire system is usually divided into smaller ones, and all of them process data flows in appropriate ways. The visualizing business processes which engages the data transfer, is commonly preformed using DFDs (data flow diagrams). DFD is used to show the data flow processing and transformation. This DFD represents the electronic system of a customer purchase. It was created using Gane/Sarson notation. Data flow diagrams helps you to sort through and clarify transferring process making it available for analysis, and representation. ConceptDraw DFD solution introduces the vector library, containing the full set of icons from DFD notations.Data Flow Diagram (DFD)
Picture: Data Flow Diagram (DFD)
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Interaction Overview Diagram

UML Interaction Overview Diagram schematically shows a control flow with nodes and a sequence of activities that can contain interaction or sequence diagrams.UML Interaction Overview Diagram. System authentication
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Design Data Flow. DFD Library

A model of a system is defined as a set of hierarchical diagrams representing the asynchronous process of data transformation from the moment it is input to the system to the moment it is output to the user. To demonstrate how a process transforms the initial data, you should design a data flow diagram using a DFD Library included in ConceptDraw PRO Solution Park. Start your diagramming experience now! You can use this library of symbols related to data flow diagrams (DFD) to design data-oriented or process-oriented models along with data process diagrams. This vector objects library It is a part of ConceptDraw solution designed for data flow diagramming, along with corresponding samples and templates. A data flow diagram is a 2D flowchart that depicts the sequence of particular activities and operations operations and activities which is accompanied by the dynamic flow of some data.Design Data Flow. DFD Library
Picture: Design Data Flow. DFD Library
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A Venn diagram, sometimes referred to as a set diagram, is a diagramming style used to show all the possible logical relations between a finite amount of sets. In mathematical terms, a set is a collection of distinct objects gathered together into a group, which can then itself be termed as a single object. Venn diagrams represent these objects on a page as circles or ellipses, and their placement in relation to each other describes the relationships between them. The Venn diagram example below visualizes the the class of language inclusions described by the Chomsky hierarchy.Venn Diagram Problem Solving Example - Chomsky Hierarchy
Picture: Venn Diagram Examples for Problem Solving. Computer Science. Chomsky Hierarchy
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DFD Library - Design elements

Data Flow Diagram is used to depict the flow of data through the system, where it enters and exits the system, as well as where it is stored. To simplify the process of drawing a data flow diagram (DFD), ConceptDraw PRO provides a DFD Library - design elements that will help you make your diagram as informative, streamlined and understandable as possible. Data flow diagrams are useful to create a general overview of the system or to document major data flows. Here are the library of symbols used in data flow diagrams (DFD). Data Flow diagrams are graphic means of business process visualization. Any business process may involve the data transfer. It can be easily shown using data flow diagrams. DFDs are used to represent the processing and transformation of data within a business process. One can find out the Vector library of DFD symbols, that is a component of ConceptDraw solution for Data Flow Diagramming and is welcome to use in as addition to the common Conceptdraw PRO diagramming facilities.DFD Library - Design elements
Picture: DFD Library - Design elements
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DFD Flowchart Symbols

A Data Flow Diagram (DFD) is a graphical technique which allows effectively model and analyze the information processes and systems. The ability to fast and easy create the DFDs is made possible with Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park. For designing the Data Flow Diagrams are used simple DFD flowchart symbols which are connected each other by arrows depicting the data flow from one step to another.DFD Flowchart Symbols
Picture: DFD Flowchart Symbols
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