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DIAGRAM 14

DFD Library System

Context-level Data Flow Diagram (DFD)


In general Flow chart diagrams are the ones that illustrate the flow of some data as such data flow diagrams can be Unified Modelling Language (or UML) diagrams, Entity Relationship Diagrams (or ERD), Data Flows Diagrams (or DFD), Structured Systems Analysis and Design Method (SSADM) or Windows and Macintosh Graphics User Interface (GUI) design diagrams.

A “data flow diagram” or “DFD” is a graphical representation of the "data flow" in some “information system” and this representation is often used for creating some system overview without going into details. These “data flow diagrams” can also be used for the data processing visualization in a structured design and any ConceptDraw DIAGRAM user can make any needed “data flow diagram” any time they want. “Data flow diagrams” are also popular, because they show what particular kind of information can be input to and output from some definite system and how the data can advance via this system. With the help of “data flow diagram” you can also illustrate where the data can be stored, although you cannot show any timing of process and whether processes will operate in sequence or in parallel.

This “data flow diagram” named a bubble chart is a designing tool used in the “Systems Design” approach. The “context-level data flow diagram” includes a Level 1 DFD showing some of the system details being modelled. The Level 1 data flow diagrams show the way some system is divided into sub-systems and how each of these sub-systems deals with the data flows. Data flow diagram also identifies internal data stores, which have to be presented, and shows the data flow between different parts of the same system.

Data flow diagrams are one of the 3 perspectives of the “Structured-Systems Analysis and Design Method, or “SSADM”. Both the sponsor of some project and the end users can be briefed and consulted at each of the stages of a system's evolution. Using data flow diagram you can show the users in what way some particular system can operate, what this system accomplishes and how it can be implemented. Also you can always draw the old system's dataflow diagrams to compare to the new system's data flow diagrams, so it is obvious to see the more efficient system.

Data flow diagrams can be also used for providing a consumer with an idea of where the inputting data has an effect on the whole system’s structure from the stage of ordering to the one dispatching and reporting. Also the way, in what any system can be developed you can also determine with the aid of “data flow diagram”, which can be used in analysis and design phases of the so-called “lifecycle of systems development”.

There are different notations you can use for drawing any needed data flow diagrams (such as “Gane and Sarson” and “Yourdon and Coad” ones). You can always use these notations for defining different visual representations for the data stores, different data flows, processes and external entities.

You can also always create the logical “Data flow diagrams”, capturing the data flows, which are necessary within some system for it to operate smoothly. This kind of Data flow diagrams describes the processes, which are undertaken, the data required and so produced by each of the processes and the stores needed for holding this particular data.

Another type of Data flow diagrams is physical Data flow diagrams, that show the way how some system is implemented at some particular moment (called “Current Physical Data flow diagrams”) or how the designer wants it to be in the future (so called “Required Physical Data flow diagrams”). This “Physical Data flow diagram” may be used for describing some data elements appearing on each piece of paper, moving around the office. A Physical Data flow diagram usually includes different references to data and they are duplicated or redundant, whereas a Logical Data flow diagram captures the data flow elements within some system in a form that has neither redundancy nor duplication.

As mentioned above, Data flow diagrams are commonly used for representing data flow in a system and they are a part of the Structured Systems Analysis and Design Methodology, consisting of different components, such as functions and processes, which represent actions happened in information system. They also include the data about the external entities which represent data ingoing and outgoing within some system. Data containers represent places in system, where data can be saved for some particular period of time and the data flows points to the directions and character of data flow in the identified information system.

Main data flow diagram elements are processes, external entities, data store and data flow. Yourdon – de Marco notation can be used for presenting Data Flow Diagram objects. Objects of Data Flow Diagrams are interpreted in a way of processes transforming input data flows into output data flows and data depositories that serve only for keeping of ingoing data and do not change them and data flows changes in external entities are not considered.

In order to create such diagram, all you need is to download ConceptDraw DIAGRAM software and start using it having fun when creating any kind of needed diagrams, having great looking final result. Our Data Flow Diagrams Solution will be very useful for those who consider making great looking, professional and smart diagrams, including the data flow ones. The Object Library contains a large number of shapes, including the design elements, such as different symbols and icons that can be used in the process of representing data flows and storage, processes and objects and other data flow entities.

You can always use this “Data Flow Diagrams” solution, which can be found and downloaded from the Software Development area of ConceptDraw Solution Park on this site or from ConceptDraw STORE application for drawing your own context-level DFDs in ConceptDraw DIAGRAM diagramming and vector drawing software.


DFD Library System *

Pic 1. DFD Library System




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
UML Class Diagram
UML Class Diagram




TEN RELATED HOW TO's:

Entity Relationship Diagram Symbols →

When we start to speak about databases, we must always mention database structure visualization. One of the most common ways to do it is to create an entity relationship diagram, and to put appropriate symbols on it. It is important either for database projecting and for its' future maintenance. Entity Relationship Diagram describes data elements and their relationships within a database. There are a set of special symbols that depict each element of an entity relationship diagram. Entities - represents some stable components such as supplier, employee, invoice, client, etc. Relation symbols show how the entities interact. Attributes define characteristics of the relationships. Attributes can be one-to-one or many-to-many. Physical symbols is used in the physical models. They represent items such as fields, tables, types and keys. ERD physical symbols are the building material for the database. Notation lines are used to illustrate the relationships. The most common method is Crow’s Feet notation. You can use ConceptDraw Entity-Relationship Diagram (ERD) solution to represent a database using the Entity-Relationship model.Entity Relationship Diagram Symbols
Picture: Entity Relationship Diagram Symbols
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How to Present a Social Media Response Plan DFD to Your Team →

Interactive tool helps you find the appropriate response to social media mentions quickly. There are materials to help trainers and consultants develop a social media strategy and provide training for social media groups on how to effectively accomplish their daily work.How to Present a Social Media Response Plan DFD to Your Team *
Picture: How to Present a Social Media Response Plan DFD to Your Team
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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
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Local area network (LAN). Computer and Network Examples →

Computer networks nowadays are spread all across the world. The large number of parameters, such as geographic scale or communication protocols, can divide networks. One of the most common types of networks is called local area network (LAN). It convenient to represent network examples by means of diagrams. This local area network (LAN) diagram provides an easy way to see the way the devices in a local network are interacted. The diagram uses a library containing specific symbols to represent network equipment , media and the end-user devices such as computers (PC, mac, laptop) , network printer, hubs, server and finally a modem. There are two types of network topologies: physical and logical. The current diagram represents precisely a physical type of LAN topology because it refers to the physical layout of a local network equipment.Local area network (LAN) diagram
Picture: Local area network (LAN). Computer and Network Examples
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Social Media Response DFD Flowcharts - diagramming software ( Mac PC ) →

Diagramming software for Mac and PC - create flowcharts and presentations for Social Media Organizing.Social Media Response DFD Flowcharts - diagramming software ( Mac PC ) *
Picture: Social Media Response DFD Flowcharts - diagramming software ( Mac PC )
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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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Pyramid Diagram →

When thinking about the process of decision making, it's easy to imagine it as a pyramid. We will look at a three level pyramid model as an example. Operational decisions are first that come to mind, and it's the first level. Tactical and strategic decisions are the second and the third levels. Pyramid (triangle) diagrams are used to show some hierarchical data. Because to the pyramid form of diagram, each diagram slice has a different width. The width of each segment depends on its hierarchical level. The current image illustrates the model of information system types. Most graphically the model can be represented as a three level pyramid. The first level shows a system of transaction processing It is concentrated on operational tasks. The second level is devoted to tactical solutions of the information system management. And at least, the third level addresses strategy and represents the executive information system. This three level pyramid sample is supplied with the ConceptDraw Pyramid Diagrams solution from Marketing area of ConceptDraw Solution Park.Pyramid Diagram *
Picture: Pyramid Diagram
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Sales Process Map →

You need create a Sales Process Map? Use the ConceptDraw DIAGRAM software which is ideal for the sales process management, marketing and engineering thanks to the powerful Sales Flowcharts solution from the Marketing area of ConceptDraw Solution Park.Sales Process Map *
Picture: Sales Process Map
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Cross-Functional Flowchart →

There are many tools to manage a process or to illustrate an algorithm or a workflow. Flowcharting is one of those tools. However, it may be difficult to show complex processes that require multiple attributes or several people in a simple flowchart, so a cross-functional flowchart would be a solution for that situation. To create such flowchart, group processes and steps to labeled rows or columns, and divide those groups with horizontal or vertical parallel lines. It is worth mentioning that there are different types of cross-functional flowcharts, like opportunity or deployment flowchart. This diagram shows a cross-functional flowchart that was made for a trading process. It contains 14 processes, distributed through 5 lines depicting the participants who interact with the process. Also there are connectors that show the data flow of information between processes. The cross-functional flowchart displays a detailed model of the trading process, as well as all participants in the process and how they interact with each other. The lines in the flowchart indicates the position, department and role of the trading process participants.Cross-Functional Flowchart
Picture: Cross-Functional Flowchart
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DIAGRAM 14