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Traditional Approach Limitations
uApproach assumes that middle tier developer has specific knowledge about the database syntax and the data model. 
uApproach is valid, but limits modularity of system. 
ØIf data model changes, middle tier will have to be refactored and retested to support the new structure. 
ØUsing tree component example, typical design methodology requires the middle tier developer to understand which tables hold the information for each of the nodes and how those records are linked together in order to form the hierarchy.