APA Dictionary of Psychology

a procedure for examining construct validity that assesses the correlations among two or more characteristics where these are each measured in two or more ways. For example, a researcher studying self-concept and achievement as measured by both self-reports and teacher evaluations could use a multitrait–multimethod model to evaluate the associations between the self-reports and teacher evaluations on each one of the characteristics. The set of correlations resulting from such an analysis is displayed in a multitrait–multimethod matrix. Also called multitrait–multimethod analysis.