Hello, ~$ ruby -v ruby 1.8.0 (2003-07-24) [i686-linux] ~$ ruby -e 'p IO.included_modules' [Enumerable, Kernel] ~$ ruby -rstringio -e 'p StringIO.included_modules' [Kernel] Is there any reason why StringIO doesn't mixin Enumerable, or is this a bug? I'm running Ruby-1.8.0-preview4. Jason Creighton