Nine independent groups of students totaling 863 subjects made a metric judgment of 13 concepts (TV programs) in a study to assess the selection of the best criterion pair in a metric multidimensional scaling (MDS) task. Using the GALILEO metric MDS program, judgments were scaled and plotted in three-dimensional space. The three hypotheses were confirmed: (1) the structure produced by a criterion pair involving the extremes of the concept domain was statistically identical to the structure produced by the same scale with no concept anchors; (2) as the distance between the criterion pair was increased, the judgments of distances among concepts increased but the pattern remained the same; (3) a criterion pair that was close together produced a larger structure than an extreme pair, yet concept interrelationships remained stable. These results are discussed in terms of the subject's ability to use metric MDS and of the reliability and validity of the technique. (Author/AA)