Made with

Data Flow Diagram

Data Flow Diagram (DFD) is the part of the SSADM method (Structured Systems Analysis and Design Methodology), intended for analysis and information systems projection. Data Flow Diagrams are intended for graphical representation of data flows in the information system and for analysis of data processing during the structural projection. By means of data flow diagrams, it is possible to show visually the work of the information system and the results of this work. Data Flow Diagram visualizes processes, data depositories, and external entities in information systems and data flow connecting these elements.

Data Flow Diagram consists of the following components:

  • Processes and functions which represent actions that happened in the information system;
  • External entities which represent in the system data ingoing and outgoing from it;
  • Data depositories which represent places in the system where data can be saved for a definite period of time;
  • Data flows, indicating the direction and character of data flowing in the considered information system.

Diagram element Graphical presentation
External Entity
Data Store
Data Flow

This variant of presentation of Data Flow Diagram objects got the name of Yourdon – de Marco notation.

Objects of Data Flow Diagrams are interpreted in the following way:

  • Processes transform input data flows into output data flows;
  • Data depositories serve only for the keeping of ingoing data and do not change them;
  • Data flows changes in external entities do not considered.

Every diagram object should have a name. Each data flow is denoted with an indication of transferred data and with the possibility of an indication of the format of these data. Data Flow Diagram should not involve more than 10 objects, excluding arrows, representing data flows. In the case of a more complicated system, the totality of several objects (as a rule, processes) is united and represented on the diagram in the form of one object. This complicated compound object is presented in the form of a separate flow diagram. Each component has a number, at this, diagrams illustrating compound objects are numerated starting from the number of an object which they describe. For example components of the diagram of the description of an object with number 5 will be enumerated 5.1, 5.2, etc. Generally, Process Flow Diagram depicts just the major equipment without details.

For clearness, there is a possibility to duplicate notations of used data depositories and external entities. Processes can’t be duplicated. For example, if one the same data depository is used in several different processes it is better to duplicate it on the diagram but not to create several intricate data flow arrows from one object to several processes. This concerns external entities as well. Duplicates of data depositories are marked with the double line from the left side, external entities duplicates - with the asterisk.

Data flow on the diagram can ramify and merge which implies branching or confluence of data in the information system.

Data Flow Diagram *

Example 1. Data Flow Diagram

Thus the information system is represented by a planner in the form of the high-level DFD in which objects are worked out in detail by diagrams of the lower level with the preset level of detailed elaboration. There is also another way of looking at which all events in the system are described at once and each event is represented in the form of process transforming data flows, further these sub runs are grouped for getting diagrams of the higher level.

process flow diagram

Example 2. Data Flow Diagram in ConceptDraw DIAGRAM

The following features make ConceptDraw DIAGRAM extended with Data Flow Diagrams Solution the best Data Flow Diagram software:

  1. You don't need to be an artist to draw professional-looking diagrams in a few minutes.
  2. Large quantity of ready-to-use vector objects makes your drawing diagrams quick and easy.
  3. A great number of predesigned templates and samples give you a good start for your own workflow diagram or process flow diagram.
  4. ConceptDraw DIAGRAM provides you the possibility to use the grid, rules, and guides. You can easily rotate, group, align, arrange the objects, use different fonts and colors to make your organizational workflow diagram exceptionally looking.
  5. All ConceptDraw DIAGRAM documents are vector graphic files and are available for reviewing, modifying, and converting to a variety of formats: image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash, MS Visio.
  6. Using ConceptDraw STORE you can navigate through ConceptDraw Solution Park, managing downloads and updates. You can access libraries, templates, and samples directly from the ConceptDraw STORE.
  7. If you have any questions, our free of charge support is always ready to come to your aid.


Stakeholder Management System using Onion Diagram →

Stakeholder management is a critical component to the successful delivery of any project, programme or activity. ConceptDraw DIAGRAM is a powerful diagramming and vector drawing software. Now, thanks to the Stakeholder Onion Diagrams Solution included to the Management Area of ConceptDraw Solution Park, ConceptDraw DIAGRAM became also unique stakeholder management system design software.Stakeholder Management System using Onion Diagram
Picture: Stakeholder Management System using Onion Diagram
Related Solution:

Flowchart Example: Flow Chart of Marketing Analysis →

An example flowchart of marketing analysis shows main steps you have to challenge writing a marketing analysis.Flowchart Example: Flow Chart of Marketing Analysis *
Picture: Flowchart Example: Flow Chart of Marketing Analysis
Related Solution:

Building Drawing Software for Design Site Plan →

Building plans are usually very complicated and a hard work to do. It would be nice to use a proper drawing software to facilitate the task. Design a site plan quick and easily with all the stencils and samples from ConceptDraw libraries. This drawing shows content of the ConceptDraw vector libraries related to the site planning and arrangement of the living environment. ConceptDraw delivers about 50 libraries containing near one and a half thousands vector objects that will help you to design territory arrangement plans and make the Site plan sketches. You can use the Parking and Roads library for designing a parking space, or drawing transport management schemes. The Site Accessories library provides a number of objects, that allow you to depict various equipment of vehicle access control, street lamps, benches, trash cans and other items of the street environment.Building Drawing Software for Design Site Plan
Picture: Building Drawing Software for Design Site Plan
Related Solution:

Workflow Diagram Data →

Workflow Diagram created by using special software based on graphic mastering technology Arrows10. Its automatics follows the global concept of business graphics and diagramming. The practical effectiveness of Arrows10 technology used in ConceptDraw DIAGRAM are around the quick auto-arrows behaving as expected and connecting boxes of workflow diagram from workflow symbol to process flow symbol. ConceptDraw DIAGRAM is a workflow diagram software contains specific features help you to draw diagrams faster, such as RapidDraw, or Arrows10. There is also a rich set of samples and templates to give you an example of data may be visualized as workflow diagram.Workflow Diagram Data *
Picture: Workflow Diagram Data
Related Solution:

Basic Circles Venn Diagram. Venn Diagram Example →

Venn Diagrams visualize all possible logical relations between several sets and are widely used in mathematics, logic, statistics, marketing, sociology, etc. This Venn Diagram shows the relative complement of the set A with respect to the set B. It is the set of the elements in B, but not in A. In other words it is the set-theoretic difference B-A.Venn Diagram Example - Basic Circles Venn Diagram
Picture: Basic Circles Venn Diagram. Venn Diagram Example
Related Solution:

Basic Audit Flowchart. Flowchart Examples →

This sample shows the Audit Process Flowchart. It was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the Flowcharts solution from the Diagrams area of ConceptDraw Solution Park. The Audit Flowcharts are widely used in the financial management, accounting, money management and in many others fields.Basic Audit Flowchart. Flowchart Examples *
Picture: Basic Audit Flowchart. Flowchart Examples
Related Solution:

UML Use Case Diagram Example. Social Networking Sites Project →

UML Diagrams Social Networking Sites Project. This sample was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the UML Use Case Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This sample shows the Facebook Socio-health system and is used at the projection and creating of the social networking sites.UML Use Case Diagram Example. Social Networking Sites Project
Picture: UML Use Case Diagram Example. Social Networking Sites Project
Related Solution:

How To Use Collaboration Tool in Project Management →

Collaboration tool for project management enables you to give a new role to knowledge management and document sharing within your team.How To Use Collaboration Tool in Project Management *
Picture: How To Use Collaboration Tool in Project Management
Related Solution:

Basic Flowchart Images. Flowchart Examples →

This sample was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the Flowcharts solution from the Diagrams area of ConceptDraw Solution Park. This sample shows the Flowchart that displays the procedures of 2PP (two-party preferred) voting and counting the voters. The two-party-preferred vote is the result of the elections that was distributed to the final two parties.Basic Flowchart Images. Flowchart Examples *
Picture: Basic Flowchart Images. Flowchart Examples
Related Solution: