Unlocking the Power of Use Case Diagram: A Step-by-Step Guide:

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Want to master Use Case Diagrams for your next software development project? My free YouTube video has got you covered! From actors to use cases, learn the essentials of creating Use Case Diagrams with ease. Check it out now and level up your skills! 📈 

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Unlocking the Power of Use Case Diagram: A Step-by-Step Guide:


A Use Case Diagram provides a graphical view of a system's functionalities, the different ways in which those functionalities can be used or accessed. 

It describes the interactions between the user and the system, and the steps involved in achieving a specific goal.

It is a diagram that shows the relationships between the actors and use cases within a system.

The two main components of a use case diagram are ‘Use Cases’ and ‘Actors’

Use Case Components: 

System Boundary:

  • Indicates the scope of the system. 
  • Use case diagram may be drawn with or without the system boundary

Use case:

  • A Use Case is a description of a system's behavior or functionality from the perspective of a user that interacts with the system.
  • Describes WHAT the system will do, not HOW the system will do it .
  • Record a set of paths (scenarios) that traverse an actor from a trigger event (start of the use case) to the goal (success scenarios). 

Actors: 

  • Actors are external users/ entities that interact with the system to achieve specific goals or tasks.
  • Actors can be human or non-human entities. 
  • It's important to identify all actors that interact with the system in order to fully understand the system's requirements and functionality. 

Specializing Actors: 

  • Actor 2 and Actor 3 are specialized types of actors because they can perform all of the Actor 1 use cases in addition to their own set of use cases. 

Relationship: 

Include: 

  • An "include" relationship is used to show that one use case is included in another use case.  
  • UseCase1 includes UseCase2 means that UseCase1 always invokes UseCase2. 

Exclude:  

  • An "extend" relationship is used to show that one use case can be extended by another use case.
  • UseCase2 extends UseCase1 means that UseCase1 sometimes invokes UseCase2.

Use Case Example:

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