This document provides an overview of Bloom's Taxonomy, including both the original taxonomy developed in 1956 and the revised taxonomy from 2001. The original taxonomy classified learning objectives according to six cognitive levels, from simplest to most complex: Knowledge, Comprehension, Application, Analysis, Synthesis, and Evaluation. Criticisms of the original led to the development of a revised taxonomy that changed the hierarchy to a two-dimensional matrix and renamed some levels and domains.