Two approaches to improving the consistency of complementary judgement matrix

By the transformation relations between complementary judgement matrix and reciprocal judgement matrix, this paper proposes two methods for improving the consistency of complementary judgement matrix and gives two simple practical iterative algorithms. These two algorithms are easy to implement on computer, and the modified complementary judgement matrices remain most information that original matrix contains. Thus the methods supplement and develop the theory and methodology for improving consistency of complementary judgement matrix.