Context: Popper held that rationality is not restricted to the realm of empirical or scientific theories, but that it is merely a special case of the general method of criticism, the method of finding and eliminating contradictions in knowledge without ad-hoc-measures. According to this view, rational discussion about metaphysical ideas, about moral values and even about purposes is possible. Popper's student W.W. Bartley III tried to radicalise this idea and made the controversial claim that not only can criticism go beyond empirical knowledge, but that everything can be rationally criticised.

Question: Popper's rational approach opposes what technique sometimes used to remove contradictions in knowledge?
Answer: ad-hoc-measures

Question: Which of Popper's students argued that rational criticism should be most widely applied?
Answer: W.W. Bartley III

Question: What type of knowledge is not the only sphere of rational criticism, according to Popper's student W.W. Bartley III?
Answer: empirical

Question: Who held that rationality is restricted  to the realm of empirical or scientific theories?
Answer: Unanswerable

Question: What is rational discussion about not possible, according to this view?
Answer: Unanswerable

Question: Who was W.W. Bartley III's student?
Answer: Unanswerable

Question: What was W.W. Bartley III's uncontroversial claim?
Answer: Unanswerable