Transcript More DFDs

More DFDs
Class 12
More examples
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Order Processing System
Registration system
Grocery store system
Let’s try another example
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We know customers send orders to the organization and
the organization sends out the products ordered with a bill
for those products.
Within the organization there is an order processing
system.
The Order Processing processing system accepts and
records data about orders and then send a message to
customers. The system accepts orders only if sufficient
inventory exists. Inventory files are updated to indicate the
inventory depleted. An Orders file is updated to record the
new order. After the order is recorded, the customer is
sent a confirmation note.
Registration system
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Draw a context level and zero-level
diagram for a class registration system.
Students will request courses and
receive a class schedule. Departments
will provide a list of courses.
Grocery store system
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A grocery store has just implemented a new
sales system. When a customer has selected
the items for checkout, the item is scanned.
The system is able to identify the item
purchased because of its bar code. The
system then looks up the price of the item
from a prices file. Once all items have been
identified, a total price is computed and given
to the customer.