1 Life Cycle of Software Specification Design –Risk Analysis –Verification Coding Testing –Refining –Production Maintenance

2 Modularity Abstraction –Separates the purpose of a module from its implementation Abstract data type –collection of data and a set of operations on the data Information Hiding Top Down Design

3 Object Oriented Design Encapsulation –Objects combine data and operations Inheritance –Classes can inherit properties from other classes Polymorphism –Objects can determine appropriate operations at execution time

4 Design Guidelines Use OOD and TDD together –Develop abstract data types and algorithms together Use OOD for problems that primarily involve data Use TDD to design algorithms for an objects operations Consider TDD for problems that emphasize algorithms over data Focus on what not how Reuse

5 Key Programming Issues Modularity Modifiability Ease of Use –Prompt for input –Echo the input –Label the output Fail-safe programming Style Debugging

6 Style Extensive use of functions Use of private data members No global data Proper use of reference arguments Error handling Readability Documentation