“According to Petroski, real knowledge from real failure is the most powerful source of progress we have, provided we have the courage to carefully examine what happened. Perhaps this is why The Boeing Company, one of the largest airplane design and engineering firms in the world, keeps a black book of lessons it has learned from design and engineering failures.[4] Boeing has kept this document since the company was formed, and it uses it to help modern designers learn from past attempts. Any organization that manages to do this not only increases its chances for successful projects, but also helps create an environment that can discuss and confront failure openly, instead of denying and hiding from it. It seems that software developers need to keep black books of their own.”