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Design Patterns 15 Years Later: An Interview with Erich Gamma, Richard Helm, and Ralph Johnson
https://www.informit.com/articles/article.aspx?p=1404056

> Erich: We did this exercise in 2005. Here are some notes from our session. We have found that the object-oriented design principles and most of the patterns haven't changed since then. We wanted to change the categorization, add some new members and also drop some of the patterns. Most of the discussion was about changing the categorization and in particular which patterns to drop.
> When discussing which patterns to drop, we found that we still love them all. (Not really?I'm in favor of dropping Singleton. Its use is almost always a design smell.)