Deviation value was first inroduced when I was in the first grade of junior high school. 75 is highest and 25 is lowest, 50 is average. All the scores of test are not comparable so indicated after its deviation was mended. Since then as if everything is determined in deviation value. My deviation value was 67 when I entered a high school. It was more than 70 when I entered the university. I had a chance to look up the deviation value of high schools. My cohabitant merely graduated high school. She said she's interested in knowing whereabouts of her school, so I looked it up. My alma mater was 70, it rose up more than the days I attended. The ranking among 6, 000 high schools is 80. Hers is 42 and the ranking is 5,000. Deviation value or deviation standard index is from its origin starange term. It indicates how deviating from ordinary nomal standard. 70 means it is deviating +20 from average 50 index and 42 means -8 from average. Deviation value has been criticised as accelarating descrimination among people, and I agree with the opinion. Deviation value is as if deviding between one centimetre out of total length of one kilometre. Very useless notion indeed. Deviation value is deviated itself. Deviated and valueless.