Question 1: A hospital reservation system has patients, hospital staff and doctors as its users. Through this portal, customers can make appointments by specifying appointment date, appointment time, preferred doctor name and Patient Info. Hospital staff are able to edit /delete appointments and make appointments by supplying patient information and doctors are able view their appointments via terminals in their office via their credentials. Doctors also can specify their vacation leaves on appointment system by supplying their login credentials so system can close specific dates for the doctors.

Draw context, Level-0 diagrams of given scenario.