Reference Larman Figure 10.3 at above. Imagine that you are a Software Designer

Question

Reference Larman Figure 10.3 at above.

Imagine that you are a Software Designer on the NexGen POS project for a major retail store, and your team is following the UP as presented by Larman. A new Senior Developer named Joe joins the team, and makes several changes to the Process Sale SSD.

1) Joe removes the "Loop" interaction frame from the scenario, saying it only makes the SSD confusing.

2) Joe expands the SSD to include the cases when makePayment happens via cash and when makePayment happens using credit or debit card.

3) Joe renames the endSale operation to be more specific. It is now called "pressEndSaleButton". He claims it's more clear and therefore better.

4) Joe changes enterItem to scanItem, saying that we know it's a scanner so using the vague word "enter" is not a good idea.

5) Joe writes Operation Contracts for each incoming Operation, with a pre- and post-condition for each. His Operation Contracts are each more than a page long. They are detailed narratives describing the state of the system before and after the operation.

6) Joe states that once his new version of the SSD and Operation Contracts are complete, the Use Cases themselves are no longer important and can be thrown away.

Write a draft email to Joe in MS Word explaining the potential issues and risks involved with each of his changes. Write your thoughts in complete, thorough sentences, and number each response to match the six numbered changes he made.

mple Cal ar 1, Customer arrives at a POS checkout with goods and/or services to purchase. 2. Cashier starts a new sale. 3. Cashier enters item identifier 4. System records sale line item and presents item description, price, and running total Cashier repeats steps 3-4 until indicates done 5. System presents total with taxes calculated 6. Cashier tells Customer the total, and asks for payment. 7. Customer pays and System handles payment Process Sale Scenario Cashier make New Sale loop more items l enterl tem(itemID, quantity) description, total end Sale total with taxes make Payment amount) change due. receipt System

Explanation / Answer

Dear Mr. Joe,

I have noticed your changes in the SSD of NexGen POS project, I would like to bring my humble comments to your attention as below.

Also I would like to thank you for your good deeds.

Regards,

Name / SD

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