The system requires modifications to enhance patient service, including creating a domain model class diagram with four classes representing components of the application: Patient, Doctor, Appointment, and Health Record. The class diagram includes relationships between these classes, such as one patient making multiple appointments. Use cases for each subsystem were identified, including registration, request for doctor, patient health record, and patient appointment. A fully developed use case description was provided for the login use case, which involves verifying a patient's id and password before allowing access to their profile page.