University of Isfahan
The growth of web has been exponential. According to a study conducted in May 2005, there were a total of over 11.5 billion pages, documents on the World Wide Web, and most of them were in the invisible Web, or Deep Web. Same figure in March 2012 is around 55 billion pages. The size of the web is expanding continuously like the universe after the big bang. The rapid growth of internet for commercial purpose has been noted by many researchers & practitioners & it has been almost impossible to escape its growth since its birth in 1990's.The increasing amount of web development work being carried out in these organizations means that such work should be carried out in a well-planned & systematic manner.