1. Chapter 3
Case Studies

2. Example 1: Point of Sale (POS)
Focus on core logic, not GUI.
other layers are technology dependent
core is similar across technologies
skills learned are applicable everywhere
design patterns of other layers not constant

3. Fig. 3.1

4. Iteration as a tool and environment
Author notes that in Iteration 1 only certain techniques used so only these are introduced at this time
In Iteration 2, we look at more UML tools, etc

5. Fig. 3.2

6. NextGen POS
records sales and handles payments, returns, etc
input devices: computers, barcode reader, fancy client terminals (Home Depot), PDA?
external interfaces: tax calculator
susceptible to communication failure like not access to credit card database
individualized client logic (if you want to sell to many businesses)

7. Monopoly
domain modeling, object design and patterns
run as a simulation; very little “player” interaction