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Abstract
A quick distribution-free test that contributes evidence of construct validity from D. T. Campbell and D. W. Fisk's (1959) Multitrait—Multimethod Matrix is presented. The procedure is carried by reducing the heterotrait—heteromethod and heterotrait—monomethod triangles and the validity and reliability diagonals into a matrix of 4 levels containing the minimum, median, and maximum values. The null hypothesis states that the values are unordered, which is tested against the alternative hypothesis of an increasing trend. The test statistic, I, is the number of inversions. The easily remembered critical values for α =.05 and.01 are 10 and 14, respectively.