Case study For the case of buying a software, steps are:

1. A Customer need to browses the catalog & then select the items to buy
2. Once done, Customer will go to check out
3. The Customer needs to fill in the shipping information like address, next-day or 3-day delivery et
4. The system will present the pricing information
5. The customer needs to fill in credit card information/paypal information
6. purchase is authorized by system (client doesnt see this)
7. Sale are confirmed by the system immediately
8. An email is sent to the customer

1. List six requirements (three functional and three non-functional) of the system. [6 marks]

2. Fill up the use case detailed description (template) of the use case checkout ONLY. [4 marks]