I have read in more than one place that "rationality is normative". I'm not too sure about what this means. I guess "normative" is whatever is related to what one ought to do or think. Does the first sentence just mean that one is rational when one thinks as one ought to? Should I also say that cooking is normative, since one ought to cook some ways and not the other? Where can I read more about this? The Stanford Online Encyclopedia of Philosophy has no article on "rationality", nor on "normativity".