Design Element: Chen
for Entity Relationship Diagram - ERD
Entity-relationship diagrams (ERDs) are intended for the development of data models and provide a standard method for determining data and relationships between them. The first notation for ERD was introduced by Chen and has been further developed by Barker.
Chen notation provides a rich set of data modeling tools, including essentially the ERD, as well as the attribute diagrams and decomposition charts. These diagram techniques are used primarily for designing relational databases.
The entity is a set of instances of real or abstract objects (people, events, conditions, ideas, items, etc.) that have common attributes or characteristics. Any system object can be represented by only one entity, that must to be uniquely identified. In this case the entity name must reflect the type or class of the object, not a specific instance. The relationship in the most general form represents a link between two or more entities.
In other words, the entities are the basic types of information stored in the database, and the relationships show how these types of data are interrelated with each other.
Entity-Relationship Diagram (ERD) solution from Software Development area of ConceptDraw Solution Park provides the libraries with predesigned set of ERD diagram design element Chen corresponding entities and relationships.
Example 1. Design Elements — Chen's (Mac OS X, Windows) for Entity Relationship Diagrams
As well as two libraries of vector stencils with entity relationship symbols, the Entity-Relationship Diagram (ERD) solution provides entity relationship diagram samples, examples, and templates. All they you can find at ConceptDraw STORE and use as the base for your own ER Diagrams.
Example 2. Entity-Relationship Diagrams - Chen Notation
The samples you see on this page were created in ConceptDraw DIAGRAM software using the Entity-Relationship Diagram (ERD) solution and show the ER Diagrams created with Chen notation. An experienced user spent 10 minutes creating these samples.
Use the Entity-Relationship Diagram (ERD) Solution for ConceptDraw DIAGRAM to create quick and easy your own ERDs using the Chen and Crow's Foot notations.
All source documents are vector graphic documents. They are available for reviewing, modifying, or converting to a variety of formats (PDF file, MS PowerPoint, MS Visio, and many other graphic formats) from the ConceptDraw STORE. The Entity-Relationship Diagram (ERD) Solution is available for all ConceptDraw DIAGRAM or later users.
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ConceptDraw DIAGRAM extended with Chemistry solution from the Science and Education area is a powerful chemistry drawing software that provides the useful tools to help you design all kinds of chemistry drawings and illustrations, chemical schemes and diagrams of formulas, reaction schemes and lab set-ups of any complexity.
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Processing Flow Chart is a simplified sketch which is used in chemical and process engineering for illustrating general plant streams, major equipments and key control loops.
ConceptDraw DIAGRAM enhanced with Flowcharts Solution from the "Diagrams" Area of ConceptDraw Solution Park is a powerful Processing Flow Chart software which will help save lots of your time.
Picture: Processing Flow Chart
Entity Relationship Diagram (ERD) is an acknowledged method to visualize the logical structure of databases. Using special symbols described in ERD notations you can depict a database of any complexity.
The vector graphic ER diagrams produced when using ConceptDraw ERD solution can be used in whitepapers, presentations, datasheets, posters, or any technical materials.
Picture: What is Entity-Relationship Diagram
Entity Relationship Diagram (aka ERD, ER Diagram, E-R Diagram) is a well-tried software engineering tool for illustrating the logical structure of databases. Professional ERD drawing is an essential software engineering method for database modeling. Use powerful tools of ConceptDraw DIAGRAM Entity Relationship Diagram Software extended with Entity-Relationship Diagram (ERD) Solution.
Picture: Entity Relationship Diagram Software
Entity Relationship Diagram (ERD) is the world-known way to show the logical structure of databases in visual manner. The best software tool for drawing Entity-Relationship Diagram is ConceptDraw DIAGRAM vector graphics software with Entity-Relationship Diagram (ERD) solution from Software Development area which gives the ability to describe a database using the Entity-Relationship model. The vector graphic diagrams produced using this solution can be successfully used in whitepapers, presentations, datasheets, posters, or any technical materials.
Picture: Entity-Relationship Diagram
UML Composite Structure Diagram shows the internal structure of a class and the possible interactions at this structure.
ConceptDraw has 393 vector stencils in the 13 libraries that helps you to start using software for designing your own UML Diagrams. You can use the appropriate stencils of UML notation from UML Composite Structure library.
Picture: UML Composite Structure Diagram. Design Elements
ERD drawing becomes easier with predesigned entity relationship symbols, work flow shapes, entity relationship stencils. All variety of ERD symbols you may need for ERDs design is packed into libraries and templates from Entity-Relationship Diagram (ERD) Solution for ConceptDraw DIAGRAM diagramming and vector drawing software.
But anyone have an ERD symbols quick reference? Detailed reference information for them is represented at the tables.
Picture: Anyone Have an ERD Symbols Quick Reference?
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Specification and Description Language (SDL) is used for creating the object-oriented diagrams, visualizing the processes of the state machines for the systems of communication, telecommunication, automotive, aviation and medical industries. SDL is a specification language for creating specifications, descriptions of the behavior, data, and inheritance for real-time systems.
This sample shows the SDL Diagram of the process game.
Picture: SDL Diagram
This method of problem analysis is widely used in IT, manufacture industries and chemical engineering. If you want to take a fresh look on your problem, you can draw a fishbone diagram with ConceptDraw DIAGRAM software, which supports both MAC OS and Windows. You can see and download fishbone diagram samples and templates in ConceptDraw Solution Park.
This Fishbone (Ishikawa) diagram can be applied as template for performing the cause and effect analysis of a service industry problems. It can help to determine factors causing problems. Causes in this diagram are categorized according to the 4S’s principle that means Surroundings, Suppliers, Systems and Skills. Grouping causes allows to reveal main interactions between different events. This diagram was made using ConceptDraw Fishbone diagrams solution. It can help to reveal the causes effected a complicated issue. Of course it can be used together with other methods of approaching to the problem solving.
Picture: Draw Fishbone Diagram on MAC Software