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Message: [QUOTE="Sebastian Hungerecker, post: 4618729"] Ok, here's what happens: parents(Class) = (parents(Module) << Class).reverse parents(Module) = (parents(Object) << Module).reverse parents(Object) = [Object] parents(Module) = ([Object] << Module).reverse = [Module, Object] parents(Class) = ([Module, Object] << Class).reverse = [Module, Object, Class].reverse = [Class, Object, Module] Anyway, do you know that you can get what you want just by calling TheClass.ancestors? Well, not quite as that also includes included modules, but TheClass.ancestors.grep(Class) would give you exactly the results you expected from your method. HTH, Sebastian [/QUOTE]