Design for Reuse
			New implementation    The original implementation may be problematic, e.g., poor performance, inadequate back-up and recovery, difficult to trouble-shoot, or unable to support growth and new features added to the system. Example.  The portal nsdl.org was originally implemented using uPortal.  This did not support important extensions that were requested and proved awkward to maintain.  It was reimplemented using PHP/MySQL.
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