The Haskell website claims that "Ericsson measured an improvement factor of between 9 and 25 in one set of experiments on telephony software". Presumably this is with Erlang not with Haskell. I have searched for the reference that substantiates this claim but I've only been able to find: http://set.gmd.de/~ap/femsys/wiger.html which talks about a productivity factor of 4 and http://www.md.chalmers.se/Cs/Research/Functional/Fudgets/haskell-vs-ada-abst... which suggests that Haskell is about 2-3 times as productive as imperative languages. Can someone point me at some more references? Especially the one that talks about a productivity improvement of 9-25? Thanks, Dominic. ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com