Hi Anandha!!
Enterprise Service Architecture (ESA)
Enterprise Services Architecture (ESA) is SAPs open architecture for adaptive business solutions. ESA creates a gradual path to flexible, service-centric system landscapes and allows a non-disruptive transition of existing applications and architecture for more flexibility and value.
The fundamental premise of ESA is the abstraction of business activities or events, modelled as enterprise services, from the actual functionality of enterprise applications. Aggregating Web services into business-level enterprise services provides more meaningful building blocks for the task of automating enterprise-scale business scenarios. Enterprise services allow IT organizations to efficiently develop composite applications.
ESA (now called Enterprise SOA) is SAP view on the SOA concept. There is an extensive section here in SDN on the topic. ESA is the style or a methodology to build applications which reflects SAP's 30 years of experience and latest IT advancements such as webservices. ESA helps you in building Flexible applications which can adopt the changes whenever occured in the market. ESA is SAP's new vision and we can realize this using Netweaver.
These links have more information
This blog may give some information
/people/kevin.liu/blog/2005/10/17/esa-soa-es
SOA - http://en.wikipedia.org/wiki/Service-oriented_architecture
Read more about SAP and ESA/SOA @ https://www.sdn.sap.com/irj/sdn/enterprisesoa
refer this thread
https://www.sdn.sap.com/irj/sdn/esa-library
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/91261244-0401-0010-2da1-c34c4bcf...
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/ba35e4a5-0701-0010-c4aa-ad42ee6c...
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b5bbf165-0701-0010-a29b-99b86599...
Pls Check it out the following url and download the ibm material for ESA Architecture
http://www.esnips.com/web/EASArchitecture
system's ESA Adoption Program (ESOA Roadmap) and SAP EA Framework in this way that :
1. ESA Adoption Program (process) reflects common business/organisational and IT strategy and defines SOA projects in which Solution Architecture and Enterprise Architecture must be build or rebuild.
In consequence SAP EA Framework is used.
2. Plan Phase of SAP EA Framework Architecture Development Cycle (ADC) with defined gaps between "to-be" and "as-is" affects Define and Evaluate Phase of ESA Adoption Program by defining details, corrections and new possibilities around services in existing Program.
Additionally if we have new Building Blocks (eg new components to reuse) SAP EA Framework Repository is changed.
3. In effect next "New Solution" project is conducted by updated ESA Adoption Program and uses updated SAP EA Framework,
<b>Pls reward if useful</b>
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