 Hacking (1999) argues against the strong version of conventionalism (which he terms ‘universal constructivism’). The point of social constructivism is to reveal that some of our classificatory categories and practices, though they may appear inevitable, are actually contingent and relative to the practice of classification in the context of social institutions and norms. However, according to Hacking, some constructed categories reflect real divisions and so we need not be constructivists in the strong sense. There is still room to distinguish between constructed kinds that reflect real categories and those that do not.