It is important to realise that the divisions outlined above are not absolutes and that other systems or hierarchies have been devised. However, Bloom's taxonomy is easily understood and widely applied. Knowledge is defined as the remembering of previously learned material. This may involve the recall of a wide range of material, from specific facts to complete theories, but all that is required is the bringing to mind of the appropriate information. Knowledge represents the lowest level of learning outcomes in the cognitive domain.
Comprehension is defined as the ability to grasp the meaning of material.
These learning outcomes go one step beyond the simple remembering of material, and represent the lowest level of understanding. Application refers to the ability to use learned material in new and concrete situations. This may include the application of such things as rules, methods, concepts, principles, laws, and theories. Learning outcomes in this area require a higher level of understanding than those under comprehension. Analysis refers to the ability to break down material into its component parts so that its organizational structure may be understood.