 Once one has identified the different types of moral thinking , the next step is to identify when one ought to think like an archangel , and when like a prole . Hare identifies three types of situation where critical thinking is necessary . The first is when the intuitive general principles conflict in particular cases . The second is when , " though there is no conflict between principles , there is something highly unusual about the case which prompts the question whether the general principles are really fitted to deal with it . " Thirdly , and most importantly , critical thinking is necessary in order to select the intuitive prima facie principles that will be used . 
