- UML Tutorial
Make UML Diagrams, flowcharts, wireframes and more. Our free diagram software and online diagram tools improve collaboration and communication. Create and coauthor professional-looking diagrams for effective decision making, data visualization, and process execution to help increase productivity across the business. Visio and Microsoft 365 Visio is an innovative solution that helps you visualize data-connected business process flows with a host of integrated features that bring the. UML 2 use case diagrams overview the usage requirements for a system. They are useful for presentations to management and/or project stakeholders, but for actual development you will find that use cases provide significantly more value because they describe 'the meat' of the actual requirements. A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since ancient times on walls of caves, but became more prevalent during the Enlightenment.
Make UML Diagrams, flowcharts, wireframes and more. Our free diagram software and online diagram tools improve collaboration and communication.
- UML 2.0 Overview
- UML Useful Resources
- Utilities
- Selected Reading
In the previous chapters, we have discussed about the building blocks and other necessary elements of UML. Now we need to understand where to use those elements.
The elements are like components which can be associated in different ways to make a complete UML picture, which is known as diagram. Thus, it is very important to understand the different diagrams to implement the knowledge in real-life systems.
Any complex system is best understood by making some kind of diagrams or pictures. These diagrams have a better impact on our understanding. If we look around, we will realize that the diagrams are not a new concept but it is used widely in different forms in different industries.
We prepare UML diagrams to understand the system in a better and simple way. A single diagram is not enough to cover all the aspects of the system. UML defines various kinds of diagrams to cover most of the aspects of a system.
You can also create your own set of diagrams to meet your requirements. Diagrams are generally made in an incremental and iterative way.
There are two broad categories of diagrams and they are again divided into subcategories −
Structural Diagrams
Behavioral Diagrams
Structural Diagrams
The structural diagrams represent the static aspect of the system. These static aspects represent those parts of a diagram, which forms the main structure and are therefore stable.
These static parts are represented by classes, interfaces, objects, components, and nodes. The four structural diagrams are −
- Class diagram
- Object diagram
- Component diagram
- Deployment diagram
Class Diagram
Class diagrams are the most common diagrams used in UML. Class diagram consists of classes, interfaces, associations, and collaboration. Class diagrams basically represent the object-oriented view of a system, which is static in nature.
Active class is used in a class diagram to represent the concurrency of the system.
Class diagram represents the object orientation of a system. Hence, it is generally used for development purpose. This is the most widely used diagram at the time of system construction.
Object Diagram
Object diagrams can be described as an instance of class diagram. Thus, these diagrams are more close to real-life scenarios where we implement a system.
Object diagrams are a set of objects and their relationship is just like class diagrams. Theyalso represent the static view of the system.
The usage of object diagrams is similar to class diagrams but they are used to build prototype of a system from a practical perspective.
Component Diagram
Component diagrams represent a set of components and their relationships. These components consist of classes, interfaces, or collaborations. Component diagrams represent the implementation view of a system.
During the design phase, software artifacts (classes, interfaces, etc.) of a system are arranged in different groups depending upon their relationship. Now, these groups are known as components.
Finally, it can be said component diagrams are used to visualize the implementation.
Deployment Diagram
Deployment diagrams are a set of nodes and their relationships. These nodes are physical entities where the components are deployed.
Deployment diagrams are used for visualizing the deployment view of a system. This is generally used by the deployment team.
Note − If the above descriptions and usages are observed carefully then it is very clear thatall the diagrams have some relationship with one another. Component diagrams are dependent upon the classes, interfaces, etc. which are part of class/object diagram. Again, the deployment diagram is dependent upon the components, which are used to makecomponent diagrams.
Behavioral Diagrams
Any system can have two aspects, static and dynamic. So, a model is considered ascomplete when both the aspects are fully covered.
Behavioral diagrams basically capture the dynamic aspect of a system. Dynamic aspect can be further described as the changing/moving parts of a system.
UML has the following five types of behavioral diagrams −
- Use case diagram
- Sequence diagram
- Collaboration diagram
- Statechart diagram
- Activity diagram
Use Case Diagram
Use case diagrams are a set of use cases, actors, and their relationships. They represent the use case view of a system.
A use case represents a particular functionality of a system. Hence, use case diagram is used to describe the relationships among the functionalities and their internal/external controllers. These controllers are known as actors.
Sequence Diagram
A sequence diagram is an interaction diagram. From the name, it is clear that the diagram deals with some sequences, which are the sequence of messages flowing from one object to another.
Interaction among the components of a system is very important from implementation and execution perspective. Sequence diagram is used to visualize the sequence of calls in a system to perform a specific functionality.
Collaboration Diagram
Collaboration diagram is another form of interaction diagram. It represents the structuralorganization of a system and the messages sent/received. Structural organization consists of objects and links.
The purpose of collaboration diagram is similar to sequence diagram. However, the specific purpose of collaboration diagram is to visualize the organization of objects and their interaction.
Statechart Diagram
Any real-time system is expected to be reacted by some kind of internal/external events. These events are responsible for state change of the system.
Statechart diagram is used to represent the event driven state change of a system. It basically describes the state change of a class, interface, etc.
State chart diagram is used to visualize the reaction of a system by internal/external factors.
Activity Diagram
Activity diagram describes the flow of control in a system. It consists of activities and links. The flow can be sequential, concurrent, or branched.
Activities are nothing but the functions of a system. Numbers of activity diagrams are prepared to capture the entire flow in a system.
Activity diagrams are used to visualize the flow of controls in a system. This is prepared to have an idea of how the system will work when executed.
Note − Dynamic nature of a system is very difficult to capture. UML has provided featuresto capture the dynamics of a system from different angles. Sequence diagrams and collaboration diagrams are isomorphic, hence they can be converted from one another without losing any information. This is also true for Statechart and activity diagram.
(redirected from diagrams)Also found in: Thesaurus, Medical, Encyclopedia.
diagram
a chart, plan, or schemeNot to be confused with:
di·a·gram
(dī′ə-grăm′)n.diagram
(ˈdaɪəˌɡræm) ndi•a•gram
(ˈdaɪ əˌgræm)n., v. -gramed-grammed, -gram•ing-gram•ming.n.
diagram
Past participle: diagrammed
Gerund: diagramming
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| Noun | 1. | diagram - a drawing intended to explain how something works; a drawing showing the relation between the parts block diagram - a diagram showing the interconnections between the components of system (especially an electronic system) drawing - a representation of forms or objects on a surface by means of lines; 'drawings of abstract forms'; 'he did complicated pen-and-ink drawings like medieval miniatures' horoscope - a diagram of the positions of the planets and signs of the zodiac at a particular time and place schematic, schematic drawing - diagram of an electrical or mechanical system Venn diagram, Venn's diagram - a diagram that uses circles to represent mathematical or logical sets pictorially inside a rectangle (the universal set); elements that are common to more than one set are represented by intersections of the circles zodiac - (astrology) a circular diagram representing the 12 zodiacal constellations and showing their signs |
| Verb | 1. | diagram - make a schematic or technical drawing of that shows interactions among variables or how something is constructed draw - represent by making a drawing of, as with a pencil, chalk, etc. on a surface; 'She drew an elephant'; 'Draw me a horse' |
diagram
Wiring Diagrams
diagram
[ˈdaɪəgræm]N (= plan) → esquemam; (= chart
Diagrams Online
) → gráficaf (Math) → diagramamdiagram
[ˈdaɪəgræm]nDiagrams Online
→ diagrammem, schémamto draw a diagram → faire un schéma
diagram
diagram
[ˈdaɪəˌgræm]n → diagrammam, schemam (Math) → diagramma, graficodiagram
(ˈdaiəgrӕm) noundiagram
→ رَسْمٌ بِيَانِيّ diagram diagramDiagrammδιάγραμμαdiagrama, esquema diagrammidiagramme dijagramdiagramma 図 그림diagramDiagrams Meaning
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di·a·gram
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