Impact of Environmental Dimensions on the Success of On Demand Systems Maturation of Complementary Infrastructure Impact of On Demand Sytems Degree of Competiveness in Services Market Cost of Computing Utilities Degree of System Compostion Competence Degree of Digitalization of Market Environemnt Degree of Service Orientation Degree of Environmental Turbulence Technological Environment External Environment CHAPTER II: PRINCIPLES OF ON DEMAND SYSTEMS While offering significant value through the leverage of information technologies, the contemporary enterprise is facing two imperatives, on one hand risk and growing complexity of its systems and procedures, and second the need for lowering cost and sharing resources. The cost issue is true, even in the face of extraordinary efficiencies and economies in computing resources. Costs have been addressed via migration to architectures that tolerate outsourcing, internal shared services and reliance on remotely hosted applications (e.g. software as a service). On demand services provides a framework for evolution of both legacy and new systems that employ new computational infrastructures such as utility computing, automatic computing, web services, grid computing, cloud computing and other forms of service oriented computing infrastructure. In an on demand services environment, resources are made available and provisioned as needed. The services and resources may be maintained within the user enterprise, or may be made available via subscription of syndication of a service provider. While few examples of pure on-demand service operations exist today, the migration and evolution of IT architectures and development practices are adjusting to the adaptive environments suggested by an on demand ecosystem. The objective is a business/market policy driven model for technology and the enterprise. It represents a continuous transformation rather than a disruptive revolution. On demand environments require principles of definition and policies, protocols that define implementation in the context of the operating environment, and standards that permit establishment of resource-sharing arrangements dynamically with all subscribing and participating parties. The current environment involves a plethora of balkanized, incompatible, non- interoperable distributed systems. The principles thus lead to standards that ultimately identify general-purpose services and tools and define operating environments. Scale issues are addressed in these environments, supporting ...
