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Message: [QUOTE="Robert Klemme, post: 4467002"] Well, types are not that important in Ruby. When we talk about "Duck Typing" then we mean, that we pass some value and if it doesn't respond to the messages that the method wants to send them we'll see that pretty quickly. This works surprisingly good (surprising for people with a static typing languages background). That's where documentation comes into play. :-) That's one option. The other is to use tests extensively. If test coverage is good (i.e. near 100%) then you will immediately notice all places where this method is called. Or you use a default value for the added parameter(s). Kind regards robert [/QUOTE]