It isn't for Erlang. If you look at the history of Erlang the language was released and after it had been in use for a while the language design team went aroun

It isn't for Erlang. If you look at the history of Erlang the language was released and after it had been in use for a while the language design team went around, identified the design patterns in use and implemented them as behaviours - the OTP system. Where design patterns go wrong is in being a description of how to build a wheel (so you don't have to redsign the wheel) - what you really want is a wheel (so you don't have to rebuild the wheel).