Abstract: In present days to determine trends in Information systems, organizations expansively used Service Oriented Architecture technology. Tradesman of Information system products want to advantage by immigrating to central based internet. Despite when immigrating legacy and traditional information system from software as a product model to the software as a service model the information system model changes. This paper explicates the obligatory modifications in the requirements elicitation process and producing a methodology for a strong immigration to software as a service. This paper elaborates by deliberating collaborative requirements information system development methodology. This methodology analyzes initial stage grade that must be deliberating in software as a service and we can reduce risk factors. Additionally this methodology discusses the new advantages in requirements elicitation that are deriving in to central based internet.

Keywords: Information systems, Service oriented technology, Central based internet, Software as a service (SaaS), Collaborative requirements.