This is the UML sequence diagram of Online Travel Portal System which shows the interaction between the objects of User, Charges, Hotel Booking, Customer, Cabs. The instance of class objects involved in this UML Sequence Diagram of Online Travel Portal System are as follows:

• User Object
• Charges Object
• Hotel Booking Object
• Customer Object
• Cabs Object

This is the UML sequence diagram of Order Management System which shows the interaction between the objects of Order Update, Payment, Delivery, Product Quality, Confirm Order. The instance of class objects involved in this UML Sequence Diagram of Order Management System are as follows:

• Order Update Object
• Payment Object
• Delivery Object
• Product Quality Object
• Confirm Order Object

This is the UML sequence diagram of Order Processing System which shows the interaction between the objects of Company, Receipt, Payment Customer, Order, Bill. The instance of class objects involved in this UML Sequence Diagram of Order Processing System are as follows:

• Company Object
• Receipt Object
• Payment Customer Object
• Order Object
• Bill Object

This is the UML sequence diagram of Parking System which shows the interaction between the objects of Type, Parking Slot, Customers, Duration, Parking Fee. The instance of class objects involved in this UML Sequence Diagram of Parking System are as follows:

• Type Object
• Parking Slot Object
• Customers Object
• Duration Object
• Parking Fee Object

This is the UML sequence diagram of Patient Care System which shows the interaction between the objects of Appoitments, Doctors, Test, Medicine, Patient. The instance of class objects involved in this UML Sequence Diagram of Patient Care System are as follows:

• Appoitments Object
• Doctors Object
• Test Object
• Medicine Object
• Patient Object

This is the UML sequence diagram of Patient Information System which shows the interaction between the objects of Treatment, Appoitments, Medicine, Patient, Doctors. The instance of class objects involved in this UML Sequence Diagram of Patient Information System are as follows:

• Treatment Object
• Appoitments Object
• Medicine Object
• Patient Object
• Doctors Object

This is the UML sequence diagram of Patient Management System which shows the interaction between the objects of Doctor, Doctor Schedule, Medicine, Test, Diease. The instance of class objects involved in this UML Sequence Diagram of Patient Management System are as follows:

• Doctor Object
• Doctor Schedule Object
• Medicine Object
• Test Object
• Diease Object

This is the UML sequence diagram of Payment Management System which shows the interaction between the objects of Account, Payment Mode, Branch, Location, Bill. The instance of class objects involved in this UML Sequence Diagram of Payment Management System are as follows:

• Account Object
• Payment Mode Object
• Branch Object
• Location Object
• Bill Object

This is the UML sequence diagram of Payroll Management System which shows the interaction between the objects of Payroll, Salary, Employee, Payments, Appraisals. The instance of class objects involved in this UML Sequence Diagram of Payroll Management System are as follows:

• Payroll Object
• Salary Object
• Employee Object
• Payments Object
• Appraisals Object

This is the UML sequence diagram of Petrol Pump Management System which shows the interaction between the objects of Inventory, Reading, Sales, Fule, Tankers. The instance of class objects involved in this UML Sequence Diagram of Petrol Pump Management System are as follows:

• Inventory Object
• Reading Object
• Sales Object
• Fule Object
• Tankers Object