Explanation:

The taxonomy is arranged so categories proceed from the simplest to more complex levels.  For example, the cognitive domain starts with the simple task of “remembering” and work towards more complex levels of thinking such as “evaluation.” The categories are also ordered from concrete to abstract.
he various levels have often been depicted as a stairway to reference a progressive climb to a higher level of thinking. According to Bloom, each level must be mastered before moving to the next higher level. Bloom believes a learner would have to first recall data and then understand it before he or she is able to apply it.