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The big problem with the Dewey system is that is hierarchical. I can see that this is necessary for physical books as they have to be filed somewhere. However that means that one is at the mercy of the person who decided what the hierarchy should be for a particular book. I much prefer the tag system as that means I can add any sort of classifications to a book, and do not have to worry about their relationship to each other. It therefore seems a much more powerful method of categorising books than Dewey provides.
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