Use Case Diagram for Stack Overflow

Let’s build the Stack Overflow use case diagram and understand the relationship between its different components. First, we’ll define the different elements of our Stack Overflow system, followed by the complete use case diagram.

System

Our system is Stack Overflow.

Actors

Now, we’ll define the main actors of Stack Overflow.

Primary actors

• User: A registered user who can:

  • Create, edit, and flag questions and answers

  • Add bounties and tags

  • Upvote/downvote content

  • Accept answers

  • Add comments

  • Vote to close/delete questions and answers

• Moderator: A privileged user who can:

  • Close, delete, reopen, and restore questions

  • Delete answers

Secondary actors

• Guest: An unregistered visitor who can:

  • Search for and view questions and answers

  • Register an account

• Admin: A system administrator who can: ...