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2 A Fusion Applications Technical Overvi... > The Extension Architecture - Pg. 47

Chapter 2: A Fusion Applications Technical Overview 47 Clearly, coexistence is a great starting point for implementing Fusion Applications; however, this inevitably represents additional work for the applications administrator. Although managing both legacy and Fusion Applications systems in addition to a major integration piece is not for the faint of heart, in the real world, this is not so unusual. For example, during any upgrade or migration, there is normally a project phase when two systems run side-by-side for a period of time before the full switch-over is done and the old system is decommissioned. The Extension Architecture Fusion Applications, and indeed all modern enterprise applications, come with a set of features and techniques to change and extended the way in which the standard software works. This is required, because although all the application features are reasonably flexible, they will never be able to satisfy the needs of every organization. Although many business analysts and consultants would push organizations toward standardization and less