UCD

Use Case Diagrams
Type of UML

• An actor has to interact directly with the system

Syntax

• Human $\to$ Stickman
• Functional Requirements, Use Cases $\to$ Oval
• Service $\to$ Rectangle

Use Case Inheritance / Generalization

register courses is the parent class
rest are the child classes
so, the other classes are inheriting the register courses use case

Abstract Use Case

Parent use case is an abstract use case, this would be because the only methods to implement it would be through the child use cases
If this is not case then the parent use case can be concrete

Syntaxial Rules

• Use Case names must start with verbs

Keywords

• extend
• include

Link

https://creately.com/blog/diagrams/use-case-diagram-relationships/