> I am convinced that absolutely no hierarchical taxonomy actually works in practice because every categorisation is really slightly fuzzy. Fuzzy is ok, not ev

> I am convinced that absolutely no hierarchical taxonomy actually works in practice because every categorisation is really slightly fuzzy. Fuzzy is ok, not everything needs to be perfect. > Tagging/labelling with attributes is the only viable solution that I've found. Categories and tags have different use cases. Categories are the best solution, when there is only one possible location for an object, like with physical objects, which cannot appear at multiple locations at the same time. Tags make sense, if you can offer multiple entry points to reach the goal, and have the option to manage them all on a reliable level. And nothing speaks against using them both, with different valuesets. Like with digital files, you can have categories for managing the filetypes (books, videos, etc.), but then use tags to manage the content in each category. > This book is fiction/science-fiction/fantasy. Isn't this kinda redundant? science-fiction is already fiction, it's in the name. Reads more like a hierarchy. Which you of course you can also with tags. Any fantasy-tag automatically inherits the fiction-tag too.