Activity Diagram for Stack Overflow

Activity diagrams are a great way to visualize the flow of messages from one activity to another in the system. There can be different activity diagrams that we can create for our Stack Overflow system. In this lesson, we will create activity diagrams for the following two activities:

• A member posting a question

• Activity challenge: A member closes a question.

A member posting a question

The following are the states and actions that will be involved in this activity diagram.

States

Initial state: The member starts by creating the question..

Final state: There are two final states present in this activity diagram, shown below:

• The question was successfully posted.

• The question is not posted.

Actions

The member creates a question and fills in the required fields. They then add tags to the question. After the post is composed, the system checks the member’s status. If the member is a moderator, the question is posted directly. If the member is a regular user, the question will only be posted if they have a good reputation.