Figure 1:

Achievement on high-level Bloom's Taxonomy items organized by the initial reasoning ability of the student and the group composition in which they were placed in inquiry instruction (a) and didactic instruction (b). Scores represent the average percentage correct out of the total number of high-level items administered. An asterisk (*) indicates that the difference between scores for low reasoners is significant (p = 0.04). Students in homogeneous groups within the didactic condition performed significantly lower than students in homogeneous groups in the inquiry condition (p = 0.02).