I am providing the Data Flow Diagram of airlines reservation system.
Still it's a level0 diagram but I am sure that it will help you to draw
the complete DFD.
TRAVEL PREFERENCE &
PASSENGER------> 0 ------>
AIRLINE <------ AGENT
Jubail Paediatricians consists of 2 doctors plus a receptionist.
Both doctors maintain records of treatment sessions. In addition, they maintain detailed child records held in reception.
When a parent arrives with a child, the receptionist enters new child details if the child has not been seen before. The receptionist also reminds parents if their account needs paying, and receives payment if offered. She records details of payment.
Parents may send payments by cheque in the mail, or pay by cheque or cash at reception. Payments are banked daily. Once a week the receptionist checks the payments. She updates the ledgers and records the updates balance on the parent's records.
She sends reminders to parents with outstanding balance.
One a year, a breakdown of treatment has to be prepared by each doctor and dispatched to the Department of Child Welfare.