Computer science: see below for details on assignment

You will draw two diagrams:  a Context Diagram and a Level 0 Diagram detailing the following process. Note:  The Context is a  “high-level” DFD.  Level 0 is the next level.  It “explodes” all the processes found in the Context. (Note:  In examining DFDs, some researchers use this schema:  Context>Level 0>Level 1…    But others use Context>Level 1>Level 2…)

A healthcare center in Baltimore employs seven doctors and two receptionists. Patients are registered with one doctor, but can arrange appointments with any available one. These appointments may subsequently be cancelled. Some appointments result in prescriptions, identifying a medicine to be taken.  New patients are registered by a receptionist. When a patient is registered, he provides details such as name, date of birth, address and health insurance information. He then receives a unique patient number.                                                                                                                             To book an appointment, a patient contacts a receptionist. The patient provides the patient ID number (or date of birth) and the receptionist provides a list of available times for appointments. The appointment is booked with the patient’s doctor or if the patient’s doctor is not available with any available doctor. The date and time of the appointment are confirmed.