SOA is an IT architecture strategy for business solution (and infrastructure solution) delivery based on the concept of service-orientation..............
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Why SOA?

Service is the important concept. Services can be published, discovered and used in a technology neutral, standard form by the set of protocols of the web services..............
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Challenges faced in SOA adoption

One of the challenges faced by SOA is managing services metadata.

Second biggest challenge is the lack of testing in SOA space..............
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What is SOA governance? What are its functions?

Service-Oriented Architecture (SOA) governance is a concept used for activities related to exercising control over services in an SOA.............
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Business Benefits of Service-Oriented Architecture

SOA can help businesses respond more quickly and economically to changing market conditions..............
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IT Benefits of Service-Oriented Architecture

IT benefits of SOA are:

The ability to build composite applications is provided.
Business services are offered across the platforms.............
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Also see

SOA Processes : Short and Long Running Processes

Fundamental differences between long-running and short-running processes, how to model state, and demonstrate how to build a long-running process, how to compile short-running BPEL processes to improve the execution speed of a burst...........

What are the advantages of OOP?

It presents a simple, clear and easy to maintain structure. It enhances program modularity since each object exists independently............

What encapsulation, inheritance, and polymorphism mean

In OOP's world everything revolves around objects and classes, and OOP languages usually offer three specifi c features for manipulating them—encapsulation, inheritance, and polymorphism........

OOPS in .NET

What is the relation between Classes and Objects? Explain different properties of Object Oriented Systems. What is difference between Association, Aggregation and Inheritance relationships? Explain the features of an abstract class in NET. Difference between abstract classes and interfaces Similarities and difference between Class and structure in .NET Features of Static/Shared classes. What is Operator Overloading in .NET?.............

Concurrency with AOP

Concurrency is the system's ability to act with several requests simultaneously, such a way that threads don't corrupt the state of objects when they gain access at the same time............