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Grokking the Low Level Design Interview Using OOD Principles

Use Case Diagram for Stack Overflow

Explore the construction of a use case diagram for Stack Overflow by identifying its main actors such as users, guests, moderators, and admins. Understand their roles and interactions within the system, including key use cases like posting questions, voting, and managing content. This lesson helps you grasp how to structure and relate system components through use cases for effective design.

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Let’s build the Stack Overflow use case diagram and understand its components’ relationship. 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

    • Block or unblock users.

    • Award badges manually. ...