The paradigm case argument is a widely employed, yet controversial, weapon in the armory of contemporary analytical philosophers. It has been hailed as a philosophical panacea, resolving paradoxes from perception to ethics; and it has been scorned as both unsound and useless. I hope in this paper to help determine its proper use: I will try to show that it can be helpful, particularly at the initial stage of clearing up linguistic misunderstandings. But I must conclude that it is unequal (...) to the more grandiose tasks assigned to it. (shrink)