1. Object-Oriented and Classical Software Engineering Sixth Edition, WCB/McGraw-Hill, Stephen R. Schach

2. CHAPTER 10 — Unit 10B
REQUIREMENTS

3. Continued from Unit 10A

4. 10.8 Initial Requirements: The Osbert Oglesby Case Study
The initial business model (the three use cases) shows how Osbert currently does business
Decide which of these use cases are also requirements of the software product to be built
Clearly, all three are requirements
Refine the resulting initial requirements
The descriptions of the use cases have to be refined

5. Initial Requirements: The Osbert Oglesby Case Study (contd)
Buy a Painting use case
Figure 10.11

6. Initial Requirements: The Osbert Oglesby Case Study (contd)
Sell a Painting use case
Figure 10.12

7. Initial Requirements: The Osbert Oglesby Case Study (contd)
Produce a Report use case
Figure 10.13

8. Initial Requirements: The Osbert Oglesby Case Study (contd)
All three descriptions are still vague
A consequence of the iterative nature of the Unified Process
For example, the algorithm details are irrelevant at this time
Basic principle: Defer all details to as late as possible
This will simplify the inevitable changes of the next iteration

9. Continued in Unit 10C