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\section{Introduction}   Few products of any type other than software are shipped with such high levels of errors. The same errors appear again and again in different projects.     Failure to learn from mistakes has consistently been a major obstacle to improving IT project management. As Boddie wrote in 1987: \begin{quote}   We talk about software engineering but reject one of the most basic engineering practices: identifying and learning from our mistakes. Errors made while building one system appear in the next one. What we need to remember is the attention given to failures in the more established branches of engineering. In software projects, as in bridge building, a successful effort can do little more than affirm that the tools and methods used were appropriate for the task. By the same token, failed projects need more than explanation or rationalization if they are to teach any lessons.   \end{quote}