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This lesson is designed as a one-shot lecture to teach first-year library students how to classify under the Dewey Decimal Classification system. It is designed for students with little to no prior knowledge of the DDC, but can also serve as a useful refresher for those with prior knowledge. The lesson includes a detailed lesson plan with reference to learning objectives, directions, assessment and potential challenges as well as materials for both the instructor and students to support the lesson. Ideally, students will leave the lesson with a firm grasp on how to classify using the DDC as assessed through the learning outcomes as well as a sense of confidence in their abilities and desire to learn more about classification.