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Module 3: Software Design & Metrics

20237m

Draw the context diagram and Level 1 DFD for the following Mail Order Processing System.

"HMV Records is a mail-order company that distributes CDs and tapes at discount prices to record club members. When an order processing clerk receives an order form, he/she verifies that the sender is a club member by checking the member file. If the sender is not a member, the clerk returns the order along with a member form. If the sender is a member, the clerk verifies the order item data by checking the Item file. Then the Daily Order file. The clerk also prints an invoice and shipping list for each order, which are forwarded to order fulfillment."

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Solution - Mail Order Processing System DFD

Description: Member checkout, clerk validates membership & item, creates daily order, invoice, shipping.

Context Diagram (Level 0)

  • Entities: Customer (Member), Member File, Item File, Order Fulfillment
  • Process: Mail Order System
  • Flows: Order Form → System → Invoice/Shipping List → Fulfillment; Member check ↔ Member File; Item check ↔ Item File
Customer ─(Order Form)─►│Mail Order System│─(Invoice/Shipping)─► Fulfillment
                        │                │─(Member Form)─► Customer (if not member)

Level 1

Processes:

  1. 1.0 Verify Member - Check Member File; if not member → return order + member form
  2. 2.0 Verify Order Item - Check Item File for availability/price
  3. 3.0 Record Daily Order - Write to Daily Order File
  4. 4.0 Generate Invoice & Shipping List - Print and forward to Fulfillment

Data Stores: D1 Member File, D2 Item File, D3 Daily Order File

Order Form →1.0 →(member OK)→2.0 →3.0 →4.0 → Fulfillment
           ↕D1            ↕D2      ↕D3

Flows balanced; contexts decomposed correctly.

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