Requirement diagrams are based on the OMG’s SysML ( System Modeling Language) standard. This requirement can be verified by running test cases related to the "Cancel Trip" and "Book Trip" use cases. The flow of control is triggered by the completion of actions (or activities) within the system. ![]() The "DiscountTravelOrderingSite" component satisfies the "Internet booking access" requirement, because it implements functions related to the requirement. A UML activity diagram in Visio looks like a flow chart. In the example shown on the right, requirements are connected to model elements in order to express the model elements that refine, satisfy or verify them. Modelio provides a spreadsheet editor dedicated to requirements analysis, as well as graphical support of requirements modeling. The flow of control is triggered by the completion of actions (or activities ) within the system. ![]() Requirements have properties and links to other elements (requirements or model elements). A UML activity diagram in Visio looks like a flow chart. If an action can be broken into a sequence of other actions, you can create an activity to. An Activity diagram enables you to group and ungroup actions. Actions are the basic units of the system behavior. A requirement can appear in other diagrams to show its relationships to other model elements. The activity diagram enables you to model the system behavior, including the sequence and conditions of execution of the actions. A requirement can define a function that a system must perform, or a performance condition a system must achieve. These features make UML activity diagrams easy to understand and comfortable to use.Ī requirement specifies a capability or condition that must be satisfied. For example, we see that the "Hotliner" partition has an actor icon, expressing that the partition represents an existing actor (called Hotliner). Icons attached to an element express when they are connected (represent, typed by) to other model elements. Modelio makes it quick and easy to create activity diagrams through smart interactions: for example, just drag & drop an operation into an activity diagram to create an “operation call action” that is connected to the operation. Activities modeled can be sequential and concurrent. They can also describe the steps in a use case diagram. Activity diagrams are often used in business process modeling. We see here embedded partitions, behavior call actions, pins, received events and data stores. An activity diagram visually presents a series of actions or flow of control in a system similar to a flowchart or a data flow diagram. ![]() Modelio supports all the detailed features of UML2 activity diagrams. Partitions can be represented horizontally or vertically. They can be "autonomous" and represent a process, or represent the behavior of an operation. Activity diagrams are used to model business processes or the dynamic part of a model (an operation’s algorithm, for example).
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