Author's note: Earlier columns have separately addressed concepts of enterprise architecture and also of XML (extensible markup language) and Web services for enterprise integration. In this and following months, we discuss changes in systems development methods necessary for evolution into the 21st century enterprise.

Last month, we discussed the evolution of software engineering and resultant problems that we have today with stovepipe systems. Tomorrow's 21st century enterprise needs systems development methods that permit rapid business change. This month, we examine further the systems development strategies for rapid change that lie behind enterprise engineering.

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