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Chapter 12: Architecture for the Reengin... > 3. LITERATURE REVIEW - Pg. 228

Architecture for the Reengineering of Legacy Point of Sale Terminals through Web Services with the creation of knowledge about the system, while at the same time attempting to change it. The process is iterative, i.e., the cycle of ac- tion and reflection continually generates new insights. Unified process, is used for development of the system. Linda Knight (et al. 2001) has examined the relative strengths and limitations of existing system development methodologies, from the traditional Waterfall to Rapid Applica- tion Development and some of the newest rapid response methods. These methods are focused on the system design. Following the System Development approach, experimentation and observation in the project is to approve the literature research, design and archi- tecture. Evaluation of the design and architecture is done by the use of the use cases. By building a prototype the integration of the particular reviewed technologies are proven and the system can be tested by novice users. transactions that is common in legacy systems and how POS-payments could be done through web services. The literature review is focused on the world-wide standards and the architecture frame- work. Other business issues, like costs are also mentioned to make clear what the considerations are when web services are investigated. 3.2 Conventional POS Terminal Communication The conventional electronic payment transaction method is used worldwide from the early eighties. POS terminals communicate via dedicated com- munication lines to one specific financial institute. All transactions are done via directly coupled connection lines. These financial institutions are mostly large players in a country or region. For example, Interpay in the Netherlands is originally founded by Dutch banks in 1994 (Interpay, 2009)