What is difference between extend and include example?

Extend is used when a use case conditionally adds steps to another first class use case. Include is used to extract use case fragments that are duplicated in multiple use cases. The included use case cannot stand alone and the original use case is not complete without the included one.

What are the benefits of class diagram?

The advantages of the class diagram Class diagrams give you a sense of orientation. They provide detailed insight into the structure of your systems. At the same time they offer a quick overview of the synergy happening among the different system elements as well as their properties and relationships.

What is the meaning of use cases?

A use case is a written description of how users will perform tasks on your website. It outlines, from a user’s point of view, a system’s behavior as it responds to a request. Each use case is represented as a sequence of simple steps, beginning with a user’s goal and ending when that goal is fulfilled.

How do you identify a cast in a use case diagram?

Identifying actors is one of the first steps in use case analysis….Actor Role Description

  1. Briefly describe the role of the actor to the system and how the actor will use the system.
  2. What is the actor’s goal?
  3. What does the actor need from the system?
  4. What is the expected outcome of the system?

What is use class diagram?

In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system’s classes, their attributes, operations (or methods), and the relationships among objects.

What is a use case with example?

A use case is a description of how a person who actually uses that process or system will accomplish a goal. It’s typically associated with software systems, but can be used in reference to any process. For example, imagine you’re a cook who has a goal of preparing a grilled cheese sandwich.

How do you describe a class diagram?

Class diagrams are the main building block in object-oriented modeling. They are used to show the different objects in a system, their attributes, their operations and the relationships among them. In the example, a class called “loan account” is depicted. The top partition contains the name of the class.

Where do we use class diagram?

The class diagram is the main building block of object-oriented modeling. It is used for general conceptual modeling of the structure of the application, and for detailed modeling translating the models into programming code. Class diagrams can also be used for data modeling.

How do you draw in a use case diagram?

Include relationship between use cases is shown by a dashed arrow with an open arrowhead from the including (base) use case to the included (common part) use case. The arrow is labeled with the keyword «include».

Who are actors in use case diagram?

Use case diagram components Actors: The users that interact with a system. An actor can be a person, an organization, or an outside system that interacts with your application or system. They must be external objects that produce or consume data.

What is meant by extending a use case?

Extend is a directed relationship that specifies how and when the behavior defined in usually supplementary (optional) extending use case can be inserted into the behavior defined in the extended use case. The extension takes place at one or more extension points defined in the extended use case.

What should be included in a use case diagram?


  1. When a use case is depicted as using the functionality of another use case, the relationship between the use cases is named as include or uses relationship.
  2. A use case includes the functionality described in another use case as a part of its business process flow.