SaaS Based Systems

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Vendors intending to provide SaaS based systems would need to adhere to a certain type of model. This model includes a fully hosted web based user interface which is offered on a SaaS-based business model and lastly the integration of software using the service-oriented architecture model (Göldi, 2007). From a system access point of view it means allowing users to access systems via the web without any special kind of software; using any standard web browser or operating system platform (Deyo, 2008). Each client receives initial access to the same generic or base version of the software and configures it according to their specific business needs for which they will be billed a fixed monthly subscription fee or variable fee based on application usage (Rochwerger et al., 2009) . It then becomes the responsibility of the SaaS vendor to manage and maintain the life-cycle of these application instances for its entire tenant base; included in this management is the back up of databases, the seamless release of updated versions, so as not to interfere with any client customisations or configurations, the security of data and management of the application virtual servers (Rochwerger et al., 2009) . The system and its components are required to be delivered on a multi-tenancy model, where multiple organisations (clients) are hosted and maintained on a single application instance and, share the resources on that environment (Enderlein et al., 2009). The multi-tenancy model is can be further described by using the apartment block analogy; where the apartment block hosts a number of tenants and, each live in an isolated area within the block but, have access to and share the same necessary amenities e.g water, electricity sewerage. The... ... middle of paper ... IEEE Conference on Emerging Technologies and Factory Automation, 293–300. Lucas, K., Adrian, M., Wang, R., & Krauss, D. (2007). The state of enterprise software adoption in europe. Mahmood, Z. (2007). Service oriented architecture: Potential benefits and challenges. Proc. WSEAS Int. Conf., Crete, Greece, Rettig, C. (2007). The trouble with enterprise software. MIT Sloan Management Review, 49(1), 21. Robert Jacobs, F., & Ted'Weston, F. (2007). Enterprise resource planning (ERP)--A brief history. Journal of Operations Management, 25(2), 357-363. Rochwerger, B., Breitgand, D., Levy, E., Galis, A., Nagin, K., Llorente, I., et al. (2009). The reservoir model and architecture for open federated cloud computing. IBM Systems Journal, 53(4) Torbacki, W. (2008). SaaS–direction of technology development in ERP/MRP systems. Archives of Materials Science, 58, 58.

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