The innovative technique of Entity–Relationship (ER) modeling was developed and introduced by Peter Chen in 1976 for database design, data modeling and representation the data structures in terms of entities and relationships. Creation of an ER model is one of the most important steps in business process modeling and database design. It is particularly useful for complex data structures that are usually hard to represent in a simple and understandable form for all. But this became possible thanks to the generally accepted Chen notation that is common and thus clear for all system designers, database developers, and business users. ER diagrams allow to visualize and document all details for designed system, all actual data requirements, depict the entities (important domain objects, people, events, ideas, conditions, etc.), their attributes and interactions each other. Chen notation supposes a visual representation of entities by rectangular boxes with indicated nouns, attributes as ovals and relationships as diamonds with verbs.
The Chen Notation solution extends ConceptDraw PRO software with rich collection of ERD samples and selection of special Chen's notation icons for effective visual representation of relationships between the entities on the ER diagrams designed with Chen notation.
The samples you see on this page were created in ConceptDraw PRO using the Chen Notation solution, and demonstrate some of the solution's capabilities and the results you can achieve.
All source documents are vector graphic documents. They are available for reviewing, modifying, and converting to a variety of available formats (PDF file, MS PowerPoint, MS Visio, and many other graphic formats) from the Solution Park, for all users who have installed the Chen Notation solution.
Example 1: Chen Notation — Entity Relationship Model
This diagram was created in ConceptDraw PRO using the Chen Notation Library from the Chen Notation Solution. An experienced user spent 10 minutes creating this sample.
This ER diagram sample demonstrates the Entity-Relationship Model for a school constructed with Chen notation. Use the commands from the Action menu of attribute object to define and visually denote the attribute’s type, also as the key attributes are underlined on this diagram.
Example 2: Chen Notation — Entity-Relationship Diagram
This diagram was created in ConceptDraw PRO using the Chen Notation library from the Chen Notation Solution. An experienced user spent 20 minutes creating this sample.
This sample diagram using the Chen Notation solution shows the type of icons and graphics you can use to develop a model of a database of arbitrary complexity according to Chen's notation.
This diagram example was redrawn from en.wikipedia.org using ConceptDraw PRO software enhanced with ConceptDraw Chen Notation solution.
Example 3: Chen Notation — WordPress File Reference
This diagram was created in ConceptDraw PRO using the ERD, Chen’s Notation Library from the Chen Notation Solution. An experienced user spent 10 minutes creating this sample.
This sample shows an Entity-Relationship Diagram of a WordPress file reference using Chen’s Notation, which represents the entities as rectangles and attributes as ovals. Creating similar diagrams in ConceptDraw PRO will take just minutes.