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Page 9 shows Haskell scoring very well for development time when compared against Ada. C++ development time was unfortunately not reported.

Ada projects tend to start slow, but readability and flexible namespacing make refactoring and maintenance much easier.

Oh, yes. Have touched Ada in VHDL (using Ada declarations syntax), declarations in Ada are very long, but extremely powerful.

Have not seen any comparable in popular languages (except Modula 3, which is for same domain), nearest as for me, guard expressions of Erlang.