This document discusses Benjamin Bloom's taxonomy of educational objectives, which classifies learning objectives into three domains: cognitive, affective, and psychomotor. The cognitive domain involves skills such as critical thinking and problem solving. It includes remembering, understanding, applying, analyzing, evaluating, and creating. The affective domain describes how people react emotionally and includes receiving, responding, valuing, organizing, and characterizing by a value set. The psychomotor domain involves physical skills and ranges from basic imitation to naturalized complex movements. The taxonomy was later revised by Bloom's students Lorin Anderson and David Krathwohl to reflect 21st century skills.