Strangely, this reminds me of a presentation on critical thinking that I attended last weekend. One of three potential frameworks for understanding critical thinking which was discussed was a developmental model, along the lines of Piaget or Kohlberg. He abstracted three stages as predominant:
a) absolutism: the belief that things are either absolutely true, or absolutely false, as apparent facts of reality.
b) relativism: where absolutes are dispensed in favor of equality for all viewpoints; he likened this to the obvious analog of moral relativism, and made some nasty aspersions about post-modernist professors.
c) fallibilism: the belief that some "truths" are more likely true or accurate, and that for any issue, there were more and less fallible positions, approaching truth.
He ranked them as the stage of fallibilism being the most advanced stage of development of critical thinking. (I was somewhat rankled by this, as seeing myself, at least provisionally, in the relativist camp. But that likely has more to do with my love of arcane epistemological theories. )