 In any case, given the great potential uses of a system of categories (many of which do not depend on claims that that category system is uniquely ‘correct’), we should not prematurely abandon attempts at developing and evaluating systems of categorization. Even if we do not think of a category system as providing a realist inventory of all that exists or a description of the fundamental intrinsic ‘divisions of reality’, a system of categories laid out in the descriptivist spirit provides a framework within which existence questions can be answered in a systematic and wholesale way, by enumerating categories so that we can then undertake further investigations into whether or not there really is anything of each kind. Working from within a categorial framework can help ensure that whatever ontology we provide is principled and unified, avoiding ad hoc and piecemeal decisions. The descriptivist’s categories also provide a tool that may be used elsewhere in ontology, e.g., in helping to ensure that comparisons of parsimony are legitimately made (by examining which categories of entity are accepted and which denied by various theories), and in checking that potential solutions to metaphysical problems are not overlooked by tacit use of a category system that is not exhaustive (Thomasson 1999, Chapters 8 and 9). Another important use of systems of categories is that, with a proposed set of categories laid out, we can, as Daniel Nolan (2011) suggests, go on to investigate questions about the relationships among entities that are placed in different categories: for example, questions about whether events depend on or are grounded in things, or (as Nolan suggests) whether things and events may ultimately be identified as belonging to a single category. Assumptions about categorizations play such a strong role in philosophical discussions (e.g., discussions of the Cartesian theory of mind, Platonist theories of mathematics, etc.), that doing the work on categories necessary to make these categorial assumptions explicit and open them for examination must remain a highly useful exercise regardless of doubts about the prospects for discovering a uniquely correct system of categories.