Emergency service information system of a hospital

a. Draw a level 1 data flow diagram of the selected system. (Hint: Use a single sheet and label each data item clearly.) (30 pts)

b. Explode one of the processes in your original data flow diagram into subprocesses, adding data flows and data stores. (40 pts)

c. List the parts of the selected system's process that are hidden to the outside observer and about which you have had to make assumptions to complete a second-level diagram. (30 pts)