Qualities of a Good Middle-Tier Architecture

O'Reilly Network Articles: Qualities of a Good Middle-Tier Architecture
IT spends a considerable sum of dollars in creating company-wide frameworks as part of building their business applications. This is especially true for typed languages like C++, Java, and C#. The core of this spending goes towards coming up with an architecture for the middle tier. How does one know if the resulting architecture will serve the needs? This article examines the qualities of a good middle-tier architecture and answers how the well known middle-tier architectures that are in vogue today stack up against this analysis. The middle-tier architectures analyzed include stored procedures, SOA, EJBs, COM+, and SQLJ.
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http://www.oreillynet.com/pub/a/onjava/2003/10/01/middletier.html
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