Integration of Interval Numbers and the Method of AHP Along with its Improvement and Application

The used numbers of the method of AHP are precise numbers, so the paper applies interval numbers to the method of AHP, forming the method of I-F-AHP, which is a better method for expressing the thinking of people and the complexity of thing than AHP, however, the main flaw of I-F-AHP is that the negative effect of interval variance is not considered. The paper improves the method of I-F-AHP, namely, revises the sorting index through using reasonable correction coefficient, which eliminates the negative effect of interval variance and increases the scientific and applicable value of the method to a great extent. After integration and improvement, the paper applies the improved method to the supplier selection to confirm the operability of the method.