The book first builds up the basic concepts inherent in the software development life cycle (SDLC). It then elaborately discusses the metho-dologies of both static testing and dynamic testing of the software, covering the concepts of structured group examinations, control flow and data flow, unit testing, integration testing, system testing and acceptance testing. The text also focuses on the importance of the cost - benefit analysis of testing processes. The concepts of test automation, object-oriented applications, client-server and web-based applications have been covered in detail. Finally, the book brings out the underlying concepts of commercial off-the-shelf (COTS) software applications and describes the testing methodologies adopted in them. The book is intended for the undergraduate and postgraduate students of computer science and engineering for a course in software testing.