Another thing that helps is a predictable, reliable undo function. If the user believes that any action is easy to undo, unknown actions won't be so scary. Of c

Another thing that helps is a predictable, reliable undo function. If the user believes that any action is easy to undo, unknown actions won't be so scary. Of course, this is sort of a chicken-and-egg problem, because other than ctrl-z in certain desktop environments (in which environments undo is not always either predictable or reliable), there is no well-known idiom for undo.