Separation of Concerns with Policy Injection Application Block

http://blogs.msdn.com/sunilkum/archive/2008/07/15/separation-of-concerns-with-policy-injections.aspx

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Introduction
Cross-Cutting Concerns: In computer science vocabulary, cross-cutting concerns are aspects of a program which affect (crosscut) other concerns. These concerns often cannot be cleanly decomposed from the rest of the system in both the design and implementation, and result in either scattering or tangling of the program, or both.
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