UML activity diagram modeling a complete user account management workflow from login through profile update and confirmation. The diagram traces the actor (User) and system interactions across thirteen activities, including account display, form editing, input validation with error handling, and database persistence. This pattern demonstrates best practices for capturing conditional logic, feedback loops, and decision points in user-facing account management features. Fork this diagram on Diagrams.so to customize swimlanes, add swimlanes for additional actors, or extend it with exception handling paths. The validation-to-error-message loop exemplifies defensive design patterns essential for production account systems.