Service Orientation

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Training: Modelling for SOA

We are seeing a continuing thrust toward the service-based business.

The service-based business continues many of the themes of the component-based business.

SOA Principles

	Service Economy	Services are regarded as intrinsically tradeable, and valued according to some notion of exchange value. (Of course we may often choose not to exercise the option to trade services, for various reasons.)
	Service Integrity	Service coherence, reliability and "wholeness" promotes broad and robust use/reuse.
	Loose Coupling	Open, asynchronous connections between components / services.
	Differentiated Service	Services where functionality, quality or cost may vary with identity and context.
	Multiple Provision	Availability of alternative implementations, biodiversity.
	Distributed Intelligence	Not only is functionality distributed across a network of services, but the intelligence governing this functionality is also distributed. Systems with distributed intelligence are amenable to much more radical change than centralized ones.
	Model-Based Management	Using business process/system models to monitor and control all aspects of system design and operational performance.

	Flexibility / Adaptability	One of the key benefits of SOA is that it allows for significant improvements in flexibility or adaptability.
	Requisite Variety	SOA solutions should be capable of "on-demand" response to the complexity of the environment.
	Reliability / Robustness	SOA solutions are inherently scaleable, and can be designed to avoid single points of failure.
	Software Productivity	Faster and more efficient delivery of solutions. In part, this is due to improvements in usability and reuse.
	Manageability	While distributed solutions have a natural tendency towards complexity, SOA technologies are available to maintain proper management and control of networked operations..

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