Now let's try drawing a level 0 diagram. Examine the following outline and then draw the diagram you think will model the situation.
When a patient arrives at Mosspark Surgery with a repeat prescription request, the receptionist checks the prescription file and writes out a prescription. This has to be authorised by the doctor before being passed to the resident chemist for dispensing. The chemist then gives the prescription to the patient. If the patient is entitled to free prescriptions, the chemist verifies this and fills in the appropriate details on a form, which is filed in the free prescriptions file. Otherwise the chemist takes the appropriate amount of money from the patient and gives them a receipt.
The answer is given on the next page, but don't look at it until you've tried to answer yourself.
Next: Answer to Activity 4