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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 newcomers in software development community. Web technology has been invented as a tool for information retrieval. 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?.