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ERD Symbols and Meanings

Entity Relationship Diagram (ERD) is a popular software engineering tool for database modeling and illustration the logical structure of databases, which uses one of two notations - Chen's or Crow’s Foot. Crow's foot notation is effective when used in software engineering, information engineering, structured systems analysis and design. Each of these notations applies its own set of ERD symbols. Crow's foot diagrams use boxes to represent entities and lines between these boxes to show relationships. Varied shapes at the ends of lines depict the cardinality of a given relationship. Chen's ERD notation is more detailed way to represent entities and relationships. ConceptDraw DIAGRAM application enhanced with all-inclusive Entity-Relationship Diagram (ERD) solution allows design professional ER diagrams with Chen's or Crow’s Foot notation on your choice. It contains the full set of ready-to-use standardized ERD symbols and meanings helpful for quickly drawing, collection of predesigned ERD samples, examples and templates. ConceptDraw Pro is a great alternative to Visio for Mac users as it offers more features and can easily handle the most demanding professional needs.
How to Build an Entity Relationship Diagram (ERD)
How to Build an Entity Relationship Diagram (ERD)

Entity Relationship Diagram Symbols

The semantic modeling method nowadays is successfully applied in database structure design. It is effective method of modeling the data structures, which is based on the meaning of these data. As a tool of semantic modeling, there are used different types of Entity-Relationship Diagrams. Entity Relationship Diagram (ERD) is applied to visually and clearly represent a structure of a business database. The main components of ERDs are: entity, relation and attributes. An entity is a class of similar objects in the model, each entity is depicted in the form of rectangle and has the name expressed by a noun. Relation is shown in the form of non-directional line that connects two entities. There are several notation styles used for ERDs: information engineering style, Chen style, Bachman style, Martin Style. The Entity Relationship Diagram symbols used for professional ERD drawing are predesigned by professionals and collected in the libraries of the Entity-Relationship Diagram (ERD) solution for ConceptDraw DIAGRAM software.

Workflow Diagram Data

Workflow Diagram created by using special software based on graphic mastering technology Arrows10. Its automatics follows the global concept of business graphics and diagramming. The practical effectiveness of Arrows10 technology used in ConceptDraw DIAGRAM are around the quick auto-arrows behaving as expected and connecting boxes of workflow diagram from workflow symbol to process flow symbol. ConceptDraw DIAGRAM is a workflow diagram software contains specific features help you to draw diagrams faster, such as RapidDraw, or Arrows10. There is also a rich set of samples and templates to give you an example of data may be visualized as workflow diagram.
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How to Create an Object-Role Modeling (ORM) Diagram

Object Role Modeling (ORM) Diagrams solution extends the ConceptDraw DIAGRAM software functionality with powerful vector diagramming and data modeling tools, large quantity of specially developed samples and examples, and rich variety of vector objects corresponding to common ORM notation, which are convenient for using when developing the comprehensive, clear and visual Object Role Modeling (ORM) diagrams and schematics.

Basic Flowchart Symbols and Meaning

Flowcharts are the best for visually representation the business processes and the flow of a custom-order process through various departments within an organization. ConceptDraw DIAGRAM diagramming and vector drawing software extended with Flowcharts solution offers the full set of predesigned basic flowchart symbols which are gathered at two libraries: Flowchart and Flowcharts Rapid Draw. Among them are: process, terminator, decision, data, document, display, manual loop, and many other specific symbols. The meaning for each symbol offered by ConceptDraw gives the presentation about their proposed use in professional Flowcharts for business and technical processes, software algorithms, well-developed structures of web sites, Workflow diagrams, Process flow diagram and correlation in developing on-line instructional projects or business process system. Use of ready flow chart symbols in diagrams is incredibly useful - you need simply drag desired from the libraries to your document and arrange them in required order. There are a few serious alternatives to Visio for Mac, one of them is ConceptDraw DIAGRAM. It is one of the main contender with the most similar features and capabilities.
How to Build a Flowchart
How to Build a Flowchart
This onion diagram sample was created on the base of the figure "Social Ecological Model (SEM)" illustrating the webpage "Cultural Competence" from the US Centers for Disease Control and Prevention (CDC) website.
"Why consider cultural competence?
It is important to communicate effectively to both the disparately affected population(s) of interest as well as other key stakeholders at the community, state, and national levels.
The diagram of the Social Ecological Model (SEM) ... depicts how health behaviors of an individual (inner oval) are influenced by the interpersonal, organizational, community, and public policy contexts and environment in which that person exists. Cultural context resides in the interpersonal band, making it a critical consideration when designing any communication plan. All obesity prevention communications should take the culture (e.g., language, thoughts, communications, actions, customs, beliefs, values, and institutions of racial, ethnic, religious, or social groups) of the target population into consideration to be effective. Interventions that successfully achieve this goal demonstrate cultural competence - behaviors, attitudes, and policies that come together in a system, agency, or among professionals to enable people to work effectively in a cross-cultural situation."
[cdc.gov/ obesity/ health_ equity/ culturalRelevance.html]
The onion diagram example "Social Ecological Model (SEM)" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Target and Circular Diagrams solution from the Marketing area of ConceptDraw Solution Park.
www.conceptdraw.com/ solution-park/ marketing-target-and-circular-diagrams
Onion diagram
Onion diagram, stacked Venn diagram, onion diagram,
This marketing diagram sample depicts balanced scorecard strategy map.
It was redesigned from the Wikimedia Commons file: Strategy map.JPG. [commons.wikimedia.org/ wiki/ File:Strategy_ map.JPG]
"A strategy map is a diagram that is used to document the primary strategic goals being pursued by an organization or management team. It is an element of the documentation associated with the Balanced Scorecard...
Strategy maps show:
(1) Each objective as text appearing within a shape (usually an oval or rectangle).
(2) Relatively few objectives (usually less than 20).
(3) Objectives are arrayed across two or more horizontal bands on the strategy map, with each band representing a 'perspective'.
(4) Broad causal relationships between objectives shown with arrows that either join objectives together, or placed in a way not linked with specific objectives but to provide general euphemistic indications of where causality lies." [Strategy map. Wikipedia]
The marketing diagram example "Balanced scorecard strategy map" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Marketing Diagrams solution from the Marketing area of ConceptDraw Solution Park.
Marketing diagram
Marketing diagram, horizontal lanes, ellipse, oval,

Data Flow Diagram Symbols. DFD Library

Data Flow Diagrams graphically represent the information transfers and process steps of a system. They visually depict how data are processed by a system in terms of inputs and outputs, how occurs the input in a system, how the data flow through an information system and where they are stored, and how occurs output from the system. DFDs give the overview of the system and models the processes aspects, they are maintained with other methods of structured systems analysis. The main goal of DFDs is achievement of understanding between developers and users. For their construction are used two notations - Gane-Sarson and Yourdon, each of them uses its own set of symbols. Data Flow Diagrams solution from Software Development area extends the ConceptDraw DIAGRAM software with templates, samples, and predesigned libraries of data flow diagram symbols for both notations, allowing you easy design the process-oriented and data-oriented models, draw the Data Flow Diagrams, Data Flowcharts, Data Process Diagrams, Information Flow Diagrams, Structured Analysis Diagrams, etc.

Concept Maps

As concept map consists from conception-blocks and links between them, you can use ConceptDraw library objects and add to a document as much objects as you need. ConceptDraw tools let you to edit, group, move objects, change their appearance and add text signs and raster or vector pictures. ConceptDraw DIAGRAM diagramming and vector drawing software extended with Concept Maps Solution from the "Diagrams" Area is effective tool for creating professional looking Concept Maps.

Influence Diagram

This sample shows the Influence Diagram. It was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the Basic Diagramming Solution from the Universal Diagramming area of ConceptDraw Solution Park. Influence diagram represents the directed acyclic graph with three types of nodes and three types of arcs that connect the nodes. Decision node is drawn as a rectangle, Uncertainty node is drawn as an oval, Value node is drawn as an octagon.