 Many of these considerations from the practice of classification in the special sciences have led to an emerging naturalist approach to the topic of natural kinds. It is clear from the examination of classification in the special sciences, that it is difficult to find a concept of natural kind that fits all of the different practices of classification. This has sometimes been used as a core argument in favour of pluralism about natural kinds (Dupré 2001) or to eliminate the need for natural kinds altogether (Hacking 2007a). Additionally, this first argument has been used to support the homeostatic property cluster view of kinds, because this takes a more liberal approach to classification. Indeed one of the motivations for Boyd’s original HPC view was to outline an account of natural kinds that was liberal enough to accommodate a diversity of natural kinds, also including the kinds in the biological and social sciences.