Continuous integration (CI) is a software engineering practice in which isolated changes are immediately tested and reported on when they are added to a larger code base. The goal of CI is to provide rapid feedback so that if a defect is introduced into the code base, it can be identified and corrected as soon as possible. [More]

Extreme Programming (XP) is a pragmatic approach to program development that emphasizes business results first and takes an incremental, get-something-started approach to building the product, using continual testing and revision. [More]

Top-down vs. Bottom-up testing is simply the way you look at things. Bottom-up testing is the testing of code that could almost be considered an extension of unit testing. [More]