# Dewey Decimal System Invented by [[Melvil Dewey]] in 1870s. Used in libraries all around the world. Uses decimal numbers to designate specific categories/genres: - 000: Computer science, information, and general - 100: Philosophy and psychology - 200: Religion - 300: Social sciences, sociology, law, etc - 400: Languages and linguistics - 500: Science-related - 600: Technology - 700: Arts - 800: Literature and languages - 900: History and geography Reference: https://www.youtube.com/watch?v=xHiL5ZviQhQ