Use case. A UMLUse Case Diagram for the interaction of a client (the actor) within a restaurant (the system) In systems engineering, use cases are used at a higher level than within software engineering, often representing missions or stakeholder goals. The detailed requirements may then be captured in Systems Modeling Language (SysML) or as contractual statements.
Use Cases are an important requirement technique that have been widely used in modern software engineering since their formal introduction by Ivar Jacobson in 1992. Use case driven development is a key characteristic of process models and frameworks such as the Unified Process (UP), Rational Unified Process (RUP), and Oracle Unified Method (OUM). With its iterative and evolutionary nature, the use case is also a good fit for agile development. History In 1986 Ivar Jacobson first formulated textual, structural, and visual modeling techniques for specifying use cases. Templates Martin Fowler Alistair Cockburn Use Case: PlantUML. To be able to generate those diagrams, you must have Graphviz software installed on your machine in the default directory c:\Program Files\GraphvizX.XX or /usr/bin/dot. You can have a look here if you have installed Graphviz somewhere else.
Let's have a fews examples : Note that you can disable the shadowing using the skinparam shadowing false command. Usecases Use cases are enclosed using between parentheses (because two parentheses looks like an oval). You can also use the usecase keyword to define a usecase. Actors Actor are enclosed using between two points. You can also use the actor keyword to define an actor. We will see latter than actor definitions is optional. Usecases description If you want to have description on several lines, you can use quotes. You can also use the following separators: -- .. == __. Basic example To link actors and use cases, the arrow --> is used. The more dashes "-" in the arrow, the longer the arrow. Extension Using notes Stereotypes Changing arrows direction. Module: UML Designer. UML Designer is a graphical tool to edit and vizualize UML 2.4 models. It uses the standard UML2 metamodel provided by Eclipse Foundation and it implements the following generic UML diagrams: Package HierarchyClass DiagamComponent DiagramObject DiagramComposite Structure DiagramDeployment DiagramUse Case DiagramActivity DiagramState MachineSequence DiagramProfile Diagram For those seeking to generate code from their UML diagrams, the UML Designer is compatible with the free UML to Java code generator.
As it is based on Obeo Designer, it provides an easy way to combine UML with domain specific modelling. You can extend the provided diagram definitions and seamlessly work on both UML and DSL models at the same time. This designer is free (open-source with EPL license). You can easily modify it with Obeo Designer to adapt each diagram to your needs or combine it to your own DSL. More detail Here. If you have any feedback, tell us on the forum, fill in our survey or report an issue.
Introduction to UML 2 Use Case Diagrams. Use case diagrams depict: Use cases. A use case describes a sequence of actions that provide something of measurable value to an actor and is drawn as a horizontal ellipse. Actors. An actor is a person, organization, or external system that plays a role in one or more interactions with your system. In the example depicted in Figure 1 students are enrolling in courses with the potential help of registrars.
Figure 1. Figure 2. Figure 3. Creating Use Case Diagrams I like to start by identifying as many actors as possible. The preceding paragraph describes my general use case modeling style, an "actors first" approach. Reuse Opportunities Figure 4 shows the three types of relationships between use cases -- extends, includes, and inheritance -- as well as inheritance between actors. Figure 4. Remaining Agile So how can you keep use case modeling agile? Figure 5. In parallel to creating the sketch I would also write a very brief description of each use case, often on a whiteboard as well. Source. Simple UML Diagrams for PowerPoint. yUML is an online tool for creating and publishing simple UML diagrams. You can use yUML to make UML diagrams and then copy and paste to your MS PowerPoint slides. This way, software architects or developers can enjoy a simple tool for software development, analysis and design using common tools and popular like PowerPoint.
The tool is free and very simple. You just need to Draw a diagram by specifying the UML language. Then you can choose the type of diagram boxes to use and this: boring, plain or scruffy. This is an example of UML diagram using the Scruffy design: You can draw Activity diagrams, Use Case Diagrams and Simple Class Diagrams using yUML. Learn more in (3 votes, average: 5.00 out of 5) Loading ... PlantUML. Current syntax for activity diagram has several limitations and drawbacks (for example, it's difficult to maintain). So a completely new syntax and implementation is proposed as beta version to users (starting with V7947), so that we could define a better format and syntax. Another advantage of this new implementation is that it's done without the need of having GraphViz installed (as for sequence diagrams).
The new syntax will replace the old one. However, for compatibility reason, the old syntax will still be recognized, to ensure ascending compatibility. Some features are still missing : partition, skins, notes, error management, titles... If you have ideas or find issues, please provide feedback so that we could enhance this new syntax.
Simple Activity Activities label starts with : and ends with ; Text formatting can be done using creole wiki syntax. They are implicitely linked in their definition order. Start/Stop Conditional Repeat loop While loop Parallel processing Notes Color. Examples of UML diagrams - use case, class, component, package, activity, sequence diagrams, etc. Sparx Systems - UML 2 Tutorial. UML 2 advances the successful UML specification, and is quickly becoming the accepted standard for specifying, documenting and visualizing software systems. The Unified Modeling Language (UML) is also used for the modeling of non-software systems, and is extensively implemented in most industry sectors including finance, military and engineering.
If you are new to the Unified Modeling Language, our Introduction to UML is a recommended starting point. UML is divided into two general sets and includes fourteen basic diagram types: 1. Structural Modeling Diagrams Structure diagrams define the static architecture of a model. 2. Behavior diagrams capture the varieties of interaction and instantaneous states within a model as it 'executes' over time; tracking how the system will act in a real-world environment, and observing the effects of an operation or event, including its results. yUML.