Still,it is words and the ordering as given above that have entered the jargon of education. The order suggests that the individual needs knowledge to comprehend and comprehension to apply. Thus understanding is viewed as more difficult than knowledge(which includes the "knowledge of procedures"-i.e.,traditional paper and pencil skill)and less difficult than application. Often knowledge is viewed as a prerequisite to understanding, and understanding in turn is considered as a necessary precursor to application. In contrast, levels 4 to 6 are considered to be equivalent higher order levels. Often the higher order thinking skills also includes level 3.