The purpose of a Use Case Diagram is to give a graphical overview of the functionalities provided by a system in terms of actors, their goals (represented as use cases), and any dependencies among those use cases. Show
A Use Case Diagram describes the usage of a system. The associations between actors and use cases represent the communications that occur between the actors and the subjects to accomplish the functionalities associated with the use cases. The subject of a use case can be represented through a system boundary. The use cases enclosed in the system boundary represent the functionalities performed by behaviors (activity diagrams, sequence diagrams, and state machine diagrams). Actors may interact either directly or indirectly with the system. They are often specialized so as to represent a taxonomy of user types or external systems. The only relationship allowed between actors in a use case diagram is generalization. This is useful in defining overlapping roles between actors. Actors are connected to use cases through communication paths, each represented by a relationship. There are four use case relationships:
Communication A communication path represents an association between two Deployment Targets. It connects actors to use cases. Include An include relationship provides a mechanism for factoring out a common functionality that is shared among multiple use cases and is always performed as part of the base use case. Extend An extend relationship provides an optional functionality, which extends the base use case at defined extension points under specified conditions. Generalization A generalization relationship provides a mechanism to specify variants of the base use case. Use cases are often organized into packages with the corresponding dependencies among the use cases included in the packages.
Get answer to your question and much more Points Received:3 of 3Comments:5.Question: (TCO 2) When drawing the use-case diagram, an analyst shoulddo the steps in this order: _____.( Chapter5 Page178 )CORRECT Get answer to your question and much more place the actors on the diagram,draw the use cases on thediagram, identify the systemboundary, and draw the linesconnecting the actors to the usecasesidentify the system boundary,place the actors on the diagram,draw the use cases on thediagram, and draw the linesconnecting the actors to the usecasesnone of the above gives thecorrect order of stepsPoints Received:3 of 3Comments:6.Question: (TCO 2) The dashed line in the Activity diagram represents_________. Get answer to your question and much more A Use Case represents a single unit of meaningful work, providing a high-level view of behavior observable to someone or something outside the system. The SysML notation for a Use Case is an ellipse, as for the UML notation. Use Cases are intended to provide a more detailed expression of the requirements modeled on a higher level. Use Case diagrams capture Use Cases and the relationships between Actors and the subject (system). You can use them to:
Use Cases also support more detailed definition via Use Case Scenarios. Use Case DiagramA SysML Use Case diagram is used to define and view Use Cases and the Actors that derive value from the system. The Use Case diagram describes the relationship between the Actors and the Use Cases. Enclosing the Use Case within a Boundary defines the border of the system; the Actors by definition lie outside the boundary. (All elements are internal to the SysML diagram frame.) While the Use Case diagram can appear simplistic, it is a powerful communication device that describes the value or goals that external roles achieve from interacting with the system. Each Use Case can be detailed, with descriptions, constraints and any number of scenarios that contain sets of steps performed alternately by Actor and system to achieve the desired goal.  Use Case ScenarioA core aspect of modeling Use Cases is performed using the Use Case Scenario feature, which helps add a more detailed text-based representation of the underlying Use Case. Using the Scenario builder, behavioral model diagrams can then be generated from these text-based details to provide a base for the more detailed design. ElementsThe main elements that can appear in Use Case diagrams are:
The main connectors that can appear in Use Case diagrams are:
UsageA Use Case diagram can be used to define the details of a Use Case and its Scenarios and Constraints, with tight connectivity and traceability, as the Use Case diagram and the textual details of the Use Cases, Scenarios and Constraints are all contained in the same model. From the Use Case scenarios you can generate Activity diagrams, Sequence diagrams and StateMachine diagrams as starting points for the analytical modeling. Learn More
What is the relationship between actor and use case?An association is the relationship between an actor and a business use case. It indicates that an actor can use a certain functionality of the business system—the business use case: Unfortunately, the association does not give any information about the way in which the functionality is used.
Which of the following relationships is used to model the relationship between a use case and an actor?An include relationship is modeled in a use case diagram by an arrow with the word <<include>> above it. An actor in a use case must be a person. An actor in a use case always represents a specific user.
What type of relationship exists between actor and use case in the use case diagram?The behavioral relationship communicates is used to connect an actor to a use case. Remember that the task of the use case is to give some sort of result that is beneficial to the actor in the system. Therefore, it is important to document these relationships between actors and use cases.
Are used to describe the relationships between actors and the use cases they participate in?Associations. Associations are used to describe the relationships between actors and the use cases they participate in. This relationship is commonly known as a “communicates-association”.
|
Which relationship describes the communication between the use case and the actors?
zusammenhängende Posts
Urheberrechte © © 2024 berikutyang Inc.
