Draw a UML use case diagram for a task management system considering the following requirements: status model for each task, association with projects, tagging system, user notifications.

For a task management system considering requirements, the following main actors and use cases can be identified:

• Actors: User, Notification System

• Use Cases:

  • Create a task
  • Change task status (status model)
  • Link a task to a project
  • Add/remove tags from a task
  • Receive notifications about changes

An approximate structure of the Use Case diagram:

[User] --> (Create task)
(Create task) --> (Link to project)
(Create task) --> (Add tags)
(Change task status) <-- [User]
(Change task status) --> (Send notification)
(Add tags) --> (Send notification)
(Link to project) --> (Send notification)
[Notification System] <-- (Send notification)

Each task has an attribute "status," which changes within the status model (e.g., "New," "In progress," "Completed"). Tags allow classifying tasks, and projects group them by context. Notifications inform users about important changes.