Bloom's Taxonomy was created in 1956 to promote higher-order thinking in education beyond memorization. It outlines three learning domains - cognitive, affective, and psychomotor. The cognitive domain involves intellectual skills and knowledge. It has six categories of cognitive processes ranging from simple to complex: knowledge, comprehension, application, analysis, synthesis, and evaluation. In 2001, Anderson and Krathwohl revised Bloom's Taxonomy, changing the names of the categories to verb forms and rearranging their order. The revision also included a matrix to classify learning objectives based on knowledge and cognitive process.