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Use Case Diagram Notations Actor. Actors are usually individuals involved with the system defined ing to their roles. Use Case. A use case describes how actors uses a system to accomplish a particular goal. Relationship. The relationships between and among the actors and the use cases. System Boundary.

UCDs have only 4 major elements: The actors that the system you are describing interacts with, the system itself, the use cases, or services, that the system knows how to perform, and the lines that represent relationships between these elements.

As mentioned, the three basic elements that make up a use case are actors, the system and the goal.

How To Write a Use Case Identify who is going to be using the website. Pick one of those users. Define what that user wants to do on the site. For each use case, decide on the normal course of events when that user is using the site. Describe the basic course in the description for the use case.

The four main components of a use case diagram are actors, systems, relationships, and use cases. Actors are any human or external system that interacts with the system. Systems are the main components of the system being modeled. Relationships show how the actors and systems interact with each other.

Use case diagram symbols and notation Use cases: Horizontally shaped ovals that represent the different uses that a user might have. Actors: Stick figures that represent the people actually employing the use cases. Associations: A line between actors and use cases.

A comprehensive use case template should include the following: a title and ID, summary, actors, trigger, flow, alternates, exceptions and a use case diagram.

Use cases often include an index, with several individual use cases for each step of a software or platforms process. For example, use cases about an online e-commerce purchase might include separate reports for adding an item to the cart, selecting a payment type and choosing a shipping and delivery option.