control group, indicating a large gain (rj^ = .24) in teachers' science process skills. Table 2 presents the means and standard deviations for each item on the Fowler for both administrations for each group. The consistency with which the post-test gains pertaining to the experimental group were larger than the post-test gains pertaining to the confrol group across the six Fowler items was statistically significant (p = .016). This conclusion is valid even if the intermeasure correlations were as high as .15 (cf Table 1 in Onwuegbuzie et al., 2011).