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The tendency for software, over time, to become difficult and costly to maintain. A software system that undergoes continuous change, such as having new functionality added to its original design, will eventually become more complex and can become disorganized as it grows, losing its original design structure. In theory, it may be better to redesign the software in order to support the changes rather than building on the existing program, but redesigning the software is more work because redesigning the existing software will introduce new bugs and problems.
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