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The larger a piece of computer software gets , the more it is likely to be dominated by some form of legacy code , and the more brutal becomes the overhead of addressing the endless examples of subtle incompatibility that inevitably arise between chunks of software originally created in different contexts . HCFA 's processes for determining coverage , assigning billing codes , and setting payment levels are causing serious delays in the availability of these breakthrough treatments for patients . This helps you catch problems like not taking out debug code , and provides a last sanity check . Our approach is to require minimal overhead for putting documents into the collection , while providing opportunities for arbitrarily extensible , iterative , and modifiable document coding , and multiple strategies for document retrieval . Thanks to Charlie for the cool table row / column deletion code , and to me for the cool html copy code , which together made it easy to make the buglist above .