Software engineering evolution

The Software Evolution is recognized as an inevitable nature of a software system. The software system should be maintained to keep their functionalities along with the environment changes such as organization changes, middle ware changes and so on. A new software system is typically implemented with existing software, named reuse based development. With the history of miseries of low reliability and delayed schedule of software development, we have been studying the importance of readability, maintainability, extensibility and so on. The fact that software life-cycle is transmigratory prevents from applying a single technology to improve the overall software quality. The rapid expansion of the IT world invites new comers in software development community. Web technology has been invented as a tool for information retrieving. Recently, so many systems including enterprise systems whose reliability is very important have been implemented as Web applications. Thus, a natural question arises: Are Verification and Validation techniques established in the half-century history of Software Engineering research applicable for this situation? The variety of the target systems requires the evolution of not only the software itself but also Software Engineering.