1. Chapter 3: Case Studies

2. 3.1. What is and is not Covered in the Case Study?  Traditional business software applications include UI elements, core application logic, database access and links to external software or hardware: To learn about OOA and D using UML we will focus on the core application logic layer; These core skills can transfer to other layers and other application styles; See Fig 3.1 for simple layer architecture scheme  Our focus is on OOA and D using the UML.

3. Fig 3.1 Simple Layer Architecture Scheme

4.  A point-of-sale (POS) system: A computerised application used to record sales and handle payment; It includes hardware (Terminals, card readers etc.); It interfaces to various external applications (inventory control, banking software etc.); May support multiple and varied client-side interfaces (thin terminals, web browser, desktops etc.); May be generic so that it can be sold to many clients (shop-chains) in various countries (which adds complexity); 3.3 Case One: The NextGen POS System

5.  Remember our focus is on learning to apply the UML for OOA and D within an iterative, evolutionary and agile process: It is not about coding, graphics or UIs;  Questions Please 3.4 Conclusion