Use Case Diagram for LinkedIn

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

System

Our system is LinkedIn.

Actors

Now, we’ll define the main actors of LinkedIn.

Primary actors

• User: This actor can create a profile including their professional information. They can create posts, apply for jobs, follow pages, and join groups. They can also interact with other users by sending them connection invitations and messages, commenting on their posts, etc.

Secondary actors

• System: This sends notifications for new connection requests, messages, comments, posts, recommendations, etc.

Use cases

In this section, we’ll define LinkedIn’s use cases. We have listed them according to their respective interactions with a particular actor.

Note: Some use cases will occur multiple times because they are shared among different actors in the system.

User

• Add/update profile: To add information like education, experience, skills, and achievements to update an existing profile

• Search: To find and view other users, company pages, or groups

• Send connection request: To send a connection request to another user

• Cancel connection request: To withdraw a previously sent connection request

• Accept/ignore connection request: To accept or ignore a received connection request

• Follow/unfollow users: To follow or unfollow other users without connecting

• View analytics: To see the number of connections, profile views, post impressions, and search appearances

• Request recommendation: To send a recommendation request to another user

• Give recommendation: To write and give a recommendation to another user

• Create post: To publish a new post on their profile or feed

• React/share/comment on the post: To engage with a post by reacting, sharing, or commenting

• React/comment on comment: To react to or comment on an existing comment

• Send/receive messages: To exchange private messages with other users

• Receive notifications: To be notified about messages, connection requests, or comments on posts

• Create company page: To create a company page on behalf of an organization

• Follow the company page: To follow a company page to receive updates

• Create group: To start a new group for a community or professional interest

• Join a group: To become a member of an existing group

• Apply to the job: To apply for a job listed on a company page

• List job openings in the company page: To list the new jobs on a company page

System

• Send notifications: To inform users about new messages, connection requests, or comments on their posts

• Add recommendation: To add a recommendation to the user’s profile

Relationships

This section describes the relationships between and among actors and their use cases.

Generalization

• The user can add or update their profile by adding or updating their education, experience, skill, or achievement. This shows that the Add/update profile use case has a generalization relationship with Add/update education, Add/update experience, Add/update skill, and Add/update achievement use cases.

• The user can view their analytics by viewing their profile views, post impressions, search appearances, or connection count. This shows that the View analytics use case has a generalization relationship with View profile views, View post impressions, View search appearances, and View connections count use cases.

Associations

The table below shows the association relationship between actors and their use cases.