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i got this case study, and requested question is to get DFD as level 0 ( level zero ).
i got this case study, and requested question is to get DFD as level 0 ( level zero ). please help me to get it
The following is the case study
Draw a DFD for the below Case Study.
Case–study Doctors’ Surgery A doctors’ surgery consists of five doctors a receptionist and a
manager. They need an information system to help them to run the facility. A patient may ring
the surgery to make an appointment with a doctor. Each patient nominally has a doctor
associated with him or her but they may often opt to see any doctor in the surgery that is
available. The receptionist sees which doctors are on duty on which days and offers
appointment alternatives from which the patient may choose. If an appointment is not available
within a short time and the patient must be seen quickly they are asked to attend an emergency
surgery that takes place every evening between 5 and 6 p.m. The appointment can be 5, 10 or
20 minutes long, dependent on the reported reason for seeing the doctor. This reason is
recorded on the system. Sometimes patients ring to cancel appointments. Appointments may
be made for up to six weeks in advance. Appointments that are more than 3 weeks old are
automatically deleted from the system. Some appointments are for a doctor to go and visit a
patient at home when the patient cannot come to the surgery. Every day one of the doctors is
available for home visits in the afternoon. A record is kept of each patient and the treatments
they have received for any ailments they may have had. Here are recorded many details such as
allergies, details of which drugs patients have been administered in which quantities and when.
Also relevant personal details of each patient are recorded. Typically the doctor who sees a
patient will want access to this information before deciding on the relevant treatment to give.
When the doctor prescribes treatment, details will be recorded in the patient’s record. Repeat
prescriptions are automatically produced by the system and are available for collection at the
surgery by the patient. At any time a doctor may suspend or cancel the prescriptions. Patients
may register with the surgery providing the number registered to each doctor is not above a
certain maximum. Sometimes patients die or leave the area. In this case the patient is removed
from the system and their details are archived. The manager is responsible for dealing with this
aspect.
