This is for my Systems Analysis and Design class..

(a) Write the data flows that appears on the DFD. Mention which data flows are input and which data flows are output.

(b) Write the data stores that appear on the DFD.

(c) How many processes are on the DFD. Write the names of the process(es).

Let us look at following DFD. The example is to add a new customer order and to update the customer and item files. The external entity is customer (not seen on the DFD). D1 Item Master Item,- D | | Item Record Customer Order Order Record Add Customer Order D21-Order Master Customer Record D3 Customer Master