The document discusses Bloom's taxonomy, which is a classification system used to define educational goals and objectives. It identifies three domains of learning - cognitive, affective, and psychomotor. The cognitive domain involves thinking and knowledge-based skills, and contains six levels: knowledge, comprehension, application, analysis, synthesis, and evaluation. The levels progress from basic recall to more complex thinking skills. The document provides definitions and examples of educational objectives for each of the six levels in the cognitive domain.