Fig. 8 A Wright map displaying the results of analyzing data from the Multidimensional Measure of Conceptual Complexity for the construct conceptual depth. The unidimensional, scaled construct runs vertically through the figure represented by the double-headed arrow and the units (in logits) running from −3.0 to 3.0. Person proficiencies are displayed in the histogram to the left of the scale. Item difficulties are displayed to the right of the scale, with the Thurstonian thresholds for each of the nine items displayed in a separate column. Capital letters correspond to the levels of the construct map (and outcome space): A marks the threshold between the None and Acausal levels; C marks the threshold between the Acausal and Causal levels; J marks the threshold between the Causal and Justified levels; M marks the threshold between the Justified and Multiple levels; and E marks the threshold between the Multiple and Emergent levels. The thick horizontal lines are weighted averages of each threshold across all items, illustrating the overall relation to the construct map