DEWEY DECIMAL SYSTEM
"How do we organize information?" Reference 000's "Who am I?" Philosophy 100's "How did we get here?" Religion and Mythology 200's "Who are the people in the world?" World Cultures & Government 300's "How can I communicate with others?" Language & Grammar 400's "How can I explain the world around me?" Science 500's "How can I control the world around me?" Technology 600's "How can I enjoy my free time?" The Arts & Recreation 700's "What are the stories of our lives?" Literature 800's "What was the world like in the past?" Biography, History, Geography 900's