THERE have been several attempts in recent philosophical discussion to present criteria for determining which words have ontological implications. I am going to concern myself with one attempt. The paradigm case argument has been appealed to in philosophical disputes ranging over such wide problem-areas as ‘other minds’, ‘freedom and determinism’ and ‘epistemological scepticism’. Reference has been made to paradigm cases in answering philosophers’ claims that ‘I can never know that another person is in pain’, ‘There are no acts of free-will’ (...) and ‘I can never know anything for certain’. (shrink)