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DFD Library — Design elements

Data Flow Diagram (DFD) notations

Data flow diagram is known to be a graphical representation of some data flow through a particular information system in a way of modelling its process aspects. It is known to be often used as one of the steps for creating an overview of the needed system as well as for visualizing some data processing in the structured design.

Any data flow diagram can show the way the information can be output from and input to some system, as well as to show in what way it can advance through the mentioned system. It is very important to mention the place this data is being stored, instead of showing the timing of some process.

Data flow diagram, or simply DFD, can be also called as “Flow Chart”. The terms are very similar as they both can be used for illustrating and so representing a flow of the needed data and all created in ConceptDraw DIAGRAM diagramming and drawing software. Flow diagrams can be Data Flows ones, Entity Relationship ones, Unified Modelling Language ones, and other, but the first one — data flow diagram, or DFD – is mostl commonly used for representing any needed data flow in some information system in a graphical way.

With help of DFD you can always represent any needed system overview in outline in ConceptDraw DIAGRAM application and having the needed solution, such as a Data Flow Diagrams one, which can be found in ConceptDraw STORE application, can simplify your work of making these drawings so it can take only a few minutes to get the professionally looking as well as smart looking result. Any data flow diagram can be also used for providing the end user with all the needed information about the inputting data. It can also be useful for mentioning the information about some particular system, which can be developed both at the stages of design and analysis.

There are a few notations, which you can always use for creating the needed data flow diagrams: “Yourdon and Coad” and “Gane and Sarson” one, used for defining numerous visual representations of the data flows, as well as external entities, data stores and other processes within some system. There are the so-called “Logical Data Flow Diagrams”, which you can also create with the help of ConceptDraw DIAGRAM diagramming and drawing software. It is always very useful to capture the needed data flows, as they are known to be necessary for the system to operate. Thus, in order to describe all the needed processes and the needed data, any DFD, whether it is a logical one or a physical one, can be helpful and useful to make.

Another mentioning type of DFD is “Physical Data Flow Diagram”. It is also well known to be called as the “Current Physical Data flow diagram”, used for the purpose of showing the way in what some system is implemented. You can make any needed, having such vector stencils, as representations of the terms of “State”, “Start State”, “External Interactor”, “Oval Process”, “Object”, “Entity (Rounded Corners)”, “Entity Relationship”, “Stop State”, “Entity with ID and Location Mentioned (Rounded Corners)”, “Data Store”, “Entity”, etc. Within the “Gane-Sarson Notation” such terms as “External Entity”, “Process”, “Process (with location)”, “Top to Top Side connector”, “Data Store”, “Jump”, “Angled Corners”, “Side to Side connector”, “Top to bottom Variable connector”, “Bottom to Side connector”, “Side to Same Side connector”, etc. can be used.

The mentioned “Process” is known to be either a manipulation or work used for transforming some data, for performing some necessary computations, for making the needed decisions or for directing the data flows, which are known to be based on the definite business rules. Such processes can be illustrated with the aid of the circles or some rectangle (usually segmented) within some data flow diagram, including some process’s name as well as process’s number.

Any data flow is known to be a movement of some data between the following three constituents: the entity, the data store and the process. Such data flow is known to be portraying the interface between different components within the data flow diagram. Any flow of data within some data flow diagram is known to be named in order to reflect the nature of the data itself which is being used. Any data flow, which is represented with the help of an arrow, is known to be annotated with the data name.

Process

The process is the manipulation or work that transforms data, performing computations, making decisions, or directing data flows based on business rules. Processes can be drawn as circles or a segmented rectangle on a DFD, and include a process name and process number.

DFD, Process

Pic. 1. DFD, Process

Data Stores

A data store is where a process stores data between processes for later retrieval by that same process or another one. Data stores are usually drawn as a rectangle with the righthand side missing and labeled by the name of the data storage area it represents, though different notations do exist.

DFD, Data Store

Pic. 2. DFD, Data Store

Data Flow

Data flow is the movement of data between the entity, the process, and the data store. Data flow portrays the interface between the components of the DFD. The flow of data in a DFD is named to reflect the nature of the data used. Data flow is represented by an arrow, where the arrow is annotated with the data name.

DFD, Data Flow

Pic. 3. DFD, Data Flow

External Entities

An entity is the source or destination of data. The source in a DFD represents these entities that are outside the context of the system. Entities are often represented as rectangles. Entities are also referred to as agents, terminators, or source/sink.

DFD, External Entities

Pic. 4. DFD, External Entities

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 DIAGRAM diagramming and vector drawing software.

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

Data Flow Diagram Symbols

Pic. 5. Data Flow Diagram (DFD) Symbols

The design elements library "DFD, Gane-Sarson notation" contains 12 symbols of Gane-Sarson DFD notation.

DFD Gane Sarson notation symbols

Pic. 6. DFD, Gane-Sarson notation symbols

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

DFD  Yourdon Coad notation symbols

Pic. 7. DFD, Yourdon and Coad notation symbols

There are many other nuances about creating data flow diagrams, but once you have ConceptDraw DIAGRAM software as well as ConceptDraw STORE application downloaded from this site in order to use its Data Flow Diagrams solution, you can always make any needed DFD within only a few minutes using the pre-made examples and templates of such drawings.

Among the mentioned layouts, you can find the following: “DFD – Model of Small Traditional Production Enterprise”, “DFD – Process of Account Receivable”, “Data Flow Diagram (DFD)”, “DFD — CERES”, “DFD — Coad/Yourdon Object Oriented Analysis Model”, “DFD — Last Resort Hotel Book Room Process”, “DFD — Interaction between IDMA and Preprocessor”, etc.

The available stencil libraries from the mentioned solution allow all ConceptDraw DIAGRAM users to get such design elements which represent: “External Entity”, “Angled connectors”, “Process”, “Process (with Location)”, “Jump”, “Top to Bottom Variable connector”, “Side to Side connector”, “Bottom to Side connector”, “Top to Top Side connector” and “Side to Same Side connector” from the “Gane-Sarson notation” library; “Class and Object”, “State”, “Data Store”, “Generalization and specialization structure”, “Whole-part structure”, “Condition”, “Loop”, “External interaction”, “Data process”, “Multiple process”, “State”, “Multi-state”, “Stop state”, “Process (offset)”, “Process”, “Center to center flow”, “Class”, “Data store”, “Loop on center”, “Instance” and “Message” from the “Yourdon and Coad notation” library.

Try the mentioned tools to create smart and professionally looking dfd for your own use.

DFD Library — Design elements *

Pic. 8. DFD Library — Design elements




Data Flow Diagrams Sample:

DFD Model of small traditional production enterprise
DFD Model
Data flow diagrams
Data Flow Diagram
DFD Process of account receivable
DFD Process




TEN RELATED HOW TO's:

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. This data flow diagram of a system of a library management is a context-level DFD. The data flow diagram of this type depicts the large system as a solid process, and does not input any explanation of its content. It is an ordinary practice - creation of a context-level data flow diagram when starting system development. This DFD was made using ConceptDraw solution designed especially for data flow diagrams development. One can find out Data Flow Diagrams Solution in a Solution Park of ConceptDraw and can use in as addition to the common Conceptdraw DIAGRAM diagramming tools.DFD Library System *
Picture: DFD Library System
Related Solution:

Taxi Service Data Flow DiagramDFD Example →

This sample shows the Data Flow Diagram of the Taxi Service and interactions between the Clients, Operators and Divers, as well as Orders and Reports databases.Taxi Service Data Flow Diagram<br>DFD Example *
Picture: Taxi Service Data Flow DiagramDFD Example
Related Solution:

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
Related Solution:

Structured Systems Analysis and Design Method. SSADM with ConceptDraw DIAGRAM →

A waterfall model describes software development process as a sequence of phases that flow downwards. SSADM is one of the implementations of waterfall method. It’s easier to learn about structured systems analysis and design method (SSADM) with ConceptDraw DIAGRAM because this software has appropriate tools for creating data flow diagrams. You can use all the three main techniques of SSADM method with special tools and predesigned templates. This data flow diagram illustrates the Structured Systems Analysis and Design Method. This method method considers analysis, projecting and documenting of information systems. Data flow models are the most important elements of SSADM and data flow diagrams are usually used for their description. It includes the analysis and description of a system as well as visualization of possible issues.Structured Systems Analysis and Design Method
Picture: Structured Systems Analysis and Design Method. SSADM with ConceptDraw DIAGRAM
Related Solution:

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 DIAGRAM 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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ConceptDraw DIAGRAM : Able to Leap Tall Buildings in a Single Bound →

ConceptDraw DIAGRAM is the world’s premier cross-platform business-diagramming tool. Many, who are looking for an alternative to Visio, are pleasantly surprised with how well they can integrate ConceptDraw DIAGRAM into their existing processes. With tens of thousands of template objects, and an easy method for importing vital custom objects from existing Visio documents, ConceptDraw DIAGRAM is a powerful tool for making extremely detailed diagrams, quickly and easily.ConceptDraw DIAGRAM : Able to Leap Tall Buildings in a Single Bound *
Picture: ConceptDraw DIAGRAM : Able to Leap Tall Buildings in a Single Bound
Related Solution:

Developing Entity Relationship Diagrams →

When you need to visually represent the structure of relational database, Entity relationship diagram (ERD) is a type of diagram for that case. Most entity-relationship diagrams can be built with objects from Flowchart solution or ERD Solution which contains inbuilt templates. Follow these steps to create your own custom ERD diagram. Don't be frightened if it looks complex, ConceptDraw DIAGRAM makes it easy to create an ERD, and hundreds of other diagrams, in minutes.Developing Entity Relationship Diagrams *
Picture: Developing Entity Relationship Diagrams
Related Solution:

Data Flow Diagram Examples →

Data flow diagrams are the graphical tool, used in the visualization of data flow of some data processing systems. It is the valuable process modeling tool. Also designing DFD is the important component of the initial part of any information system development project. The standard symbols are used to represent the interaction of a system components and how various kinds of components influence on data flow. The ConceptDraw Data Flow Diagrams solution is design to assist professional software engineers in making DFDs according to Gane and Sarson, and Yourdon and Coad notations. Do you imagine yourself as a successful IT specialist? To your mind, they all use data flow diagram examples to learn and to get inspired. Aren’t you still with us?Data Flow Diagram Examples *
Picture: Data Flow Diagram Examples
Related Solution:

Flow chart Example. Warehouse Flowchart →

If you want to find a way to understand complex things in minutes, you should try to visualize data. One of the most useful tool for this is creating a flowchart, which is a diagram representing stages of some process in sequential order. There are so many possible uses of flowcharts and you can find tons of flow charts examples and predesigned templates on the Internet. Warehouse flowchart is often used for describing workflow and business process mapping. Using your imagination, you can simplify your job or daily routine with flowcharts. Warehouse flowcharts are used to document product and information flow between sources of supply and consumers. The flowchart provides the staged guidance on how to manage each aspect of warehousing and describes such aspects as receiving of supplies; control of quality; shipment and storage and corresponding document flow. Warehouse flowchart, being actual is a good source of information. It indicates the stepwise way to complete the warehouse and inventory management process flow. Also it can be very useful for an inventory and audit procedures.Warehouse Flowchart
Picture: Flow chart Example. Warehouse Flowchart
Related Solution:

Data Flow Diagram Model →

Developing a software project supposes architecture first. To make it proper, you can use data flow diagram model in your current project. The data flow diagram represents the Model of small traditional production enterprise that is made using Yourdon and Coad notation. It shows how the data is transfered through a process. According to the notation of Yourdon and Coad a process is represented by circles and data stores are drawn using parallel lines. This DFD was created using the ConceptDraw Data Flow Diagrams solution. Using this solution one can visualize data flow accordingly to the rules of two basic notations used for data flow modeling.Data Flow Diagram Model *
Picture: Data Flow Diagram Model
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