Online Travel Portal System Class Diagram describes the structure of a Online Travel Portal System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Online Travel Portal System are Users, Registrations Customer, Cabs, Bookings, Charges, Payments.

Order Management System Class Diagram describes the structure of a Order Management System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Order Management System are Product, Order, Confirm Order, update, Customer, Product Quality.

Order Processing System Class Diagram describes the structure of a Order Processing System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Order Processing System are Product, Customer, Order, Bill, Company, Payment.

Parking System Class Diagram describes the structure of a Parking System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Parking System are Parking Slots, Vehicles, Parking Fees, Duration, Types, Customers.

Patient Care System Class Diagram describes the structure of a Patient Care System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Patient Care System are Patient, Medicines, Tests, Treatments, Reports, Doctors.

Patient Information System Class Diagram describes the structure of a Patient Information System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Patient Information System are Tests, Treatments, Reports, Doctors, Patient, Medicines.

Patient Management System Class Diagram describes the structure of a Patient Management System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Patient Management System are Patient, Doctor, Doctor Schedule, Diease, Test, Medicine.

Payment Management System Class Diagram describes the structure of a Payment Management System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Payment Management System are Payment, Bill, Receipt, Account, Branch, Location.

Payroll Management System Class Diagram describes the structure of a Payroll Management System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Payroll Management System are Payroll, Salary, Employee, Appraisals, Woking Points, Payments.

Petrol Pump Management System Class Diagram describes the structure of a Petrol Pump Management System classes, their attributes, operations (or methods), and the relationships among objects. The main classes of the Petrol Pump Management System are Fule, Sales, Stocks, Tankers, Meter Readings, Inventory.