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A Service of SOA is :

A unit of independent deployment and versioning.

Multiple-use.

Non-context specific(reusable). Composable with other components.

Encapsulated i.e. non-investigable through its

interfaces.

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SOA is architecture that represents software

functionality as discoverable services on the

network.

SOA might be "an application architecture withinwhich all functions are defined as independent

services with well-defined invokable interfaces,

which can be called in defined sequences to form

business processes".

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WS-SOA removed another barrier by allowing

applications to interconnect in an object-model-

neutral way.

The invoking application doesn't have to knowwhere the transaction will run, what language it is

written in or what route the message may take

along the way.

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SOAs offer the following advantages over traditional approaches to distributed computing: They offerbusiness services across the platforms

They provide location independence

Completely loosely coupled approach

Authentication and authorization support at every level

The search and connectivity to other services is dynamic

Short-term benefits of implementation:

Enhances reliability

Reduces hardware acquisition costs

Leverages existing development skills Accelerates movement to standards-based server and application consolidation

Long-term benefits of implementation:

Provides the ability to build composite applications

Creates a self-healing infrastructure that reduces management costs

Provides truly real-time decision-making applications

Enables the compilation of a unified taxonomy of information across an enterprise and its customer and partners

Benefits from the perspective of Business Value

Ability to more quickly meet customer demands

Lower costs associated with the acquisition and maintenance of technology

Management of business functionality closer to the business units.

Leverages existing investments in technology

Reduces reliance on expensive custom development

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Business Value

Given the rate at which the market is evolving, it

is almost impossible to carry out long-term

planning. It is critical to be able to plan on a rolling

basis, rapidly and continuously.

With SOA we anticipate market changes, increase

time to market, customized solutions to different

partners, reduce operating costs.

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Reach and Range

Reach: For whom the services are made

available.

Range: number of diversity of services madeavailable.

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Maturity and adoption strategies

SOA on pilot

Not used in a big-bang projects.

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Building Business Case.

Architecture Elements

SOA Project Planning

SOA analysis and Design Securing SOA environment

Managing the SOA Environment