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"Chen's notation for entity–relationship modeling uses rectangles to represent entity sets, and diamonds to represent relationships appropriate for first-class objects: they can have attributes and relationships of their own. If an entity set participates in a relationship set, they are connected with a line.
Attributes are drawn as ovals and are connected with a line to exactly one entity or relationship set.
Cardinality constraints are expressed as follows:
- a double line indicates a participation constraint, totality or surjectivity: all entities in the entity set must participate in at least one relationship in the relationship set;
- an arrow from entity set to relationship set indicates a key constraint, i.e. injectivity: each entity of the entity set can participate in at most one relationship in the relationship set;
- a thick line indicates both, i.e. bijectivity: each entity in the entity set is involved in exactly one relationship.
- an underlined name of an attribute indicates that it is a key: two different entities or relationships with this attribute always have different values for this attribute.
Attributes are often omitted as they can clutter up a diagram; other diagram techniques often list entity attributes within the rectangles drawn for entity sets." [Entity–relationship model. Wikipedia]
The vector stencils library ERD, Chen's notation contains 13 symbols for drawing entity-relatinship diagrams using the ConceptDraw PRO diagramming and vector drawing software.
The example "Design elements - ER diagram (Chen notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Chen's ERD
Chen's ERD, week key attribute, weak entity, relationship, multivalue attribute, key attribute, identifying relationship, entity, derived attribute, attribute, associative entity,
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HelpDesk

How to Create a Timeline Diagram in ConceptDraw PRO

How to Create a Project Timeline Diagram
A Timeline is a chart which displays a project plan schedule in chronological order. A Timeline is used in project management to depict project milestones and visualize project phases, and show project progress. The graphic form of a timeline makes it easy to understand critical project milestones, such as the progress of a project schedule. Timelines are particularly useful for project scheduling or project management when accompanied with a Gantt chart. It captures the main of what the project will accomplish and how it will be done. making a project timeline is one of the most important skills a project manager needs have. Making comprehensive, accurate timelines allows you getting every project off in the best way. ConceptDraw PRO allows you to draw a timeline charts using special library.

pvc pipe furniture plans, pvc pipe plans, plumbing plans examples, How to read plumbing plans? plumbing floor plan, plumbing layout plan, half pipe plans, pipe bender plans, plumbing plan symbols Plumbing and Piping Plans

pvc pipe furniture plans, pvc pipe plans, plumbing plans examples, How to read plumbing plans? plumbing floor plan, plumbing layout plan, half pipe plans, pipe bender plans, plumbing plan symbols
Plumbing and Piping Plans solution extends ConceptDraw PRO v10.2.2 software with samples, templates and libraries of pipes, plumbing, and valves design elements for developing of water and plumbing systems, and for drawing Plumbing plan, Piping plan, PVC Pipe plan, PVC Pipe furniture plan, Plumbing layout plan, Plumbing floor plan, Half pipe plans, Pipe bender plans.

Computer and Network Package

Computer and Network Package is a large set of valuable graphical solutions from ConceptDraw Solution Park, developed and specially selected to help computer network specialists and IT professionals to realize their daily work the most efficiently and quickly. This package contains extensive set of graphic design tools, ready-to-use vector elements, built-in templates and samples for designing professional-looking diagrams, charts, schematics and infographics in a field of computer network technologies, cloud computing, vehicular networking, wireless networking, ensuring networks security and networks protection. It is useful for designing different floor plans and layout plans for homes, offices, hotels and instantly construction detailed schemes of computer networks and wireless networks on them, for making professional-looking and colorful Pie Charts, Bar Graphs and Line Charts visualizing the relevant information and data.

ducation infographics and infograms, Business intelligence dashboards, Business intelligence charts and maps, Bubble diagrams and charts, Spray diagrams, Circle-Spoke diagrams and models, Circle diagrams, Circular arrows diagrams, Circular flow diagrams, Education Package

ducation infographics and infograms, Business intelligence dashboards, Business intelligence charts and maps, Bubble diagrams and charts, Spray diagrams, Circle-Spoke diagrams and models, Circle diagrams, Circular arrows diagrams, Circular flow diagrams,
Education Package is a comprehensive set of multifarious graphical solutions from ConceptDraw Solution Park, collected together in help to ConceptDraw PRO users working in a field of science, education and training, which is aimed at improving the quality of education and helping to design with ease variety of interesting and colorful educational materials, diagrams, charts and maps. Use it to present the information and knowledge in an interesting, clear, structured and simple form to achieve a success in education and pedagogy, to maintain the interest of students and pupils throughout the whole learning process, at the lectures, lessons and even during independent work with additional materials, to contribute to better perception of scientific information by listeners during the conferences and reports.

IDEF4 Standard

IDEF4 model example
Use Case Diagrams technology. IDEF4 standard implies not only graphical presentation but the additional information about diagrams of heredity, methods systematization and types which are contained in specifications.