Criticisms of the AHP• Conversion from verbal to numeric scale. Decision makers using the verbal method of comparison will have their judgments automatically converted to the numeric scale, but the correspondence between the two scales is based on untested assumptions.• Problems of 1 to 9 scale. Experimental work suggests that when one attribute or option is ‘extremely more important’ than another then ratios of 1 to 3 or 1 to 5 are more appropriate than the 1 to 9 ratio assumed by the AHP.
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