The combined coefficient alpha from studies reporting the reliability of scores using the Conceptions of Mathematics Questionnaire were computed. Five studies comprising 898 participants were evaluated. A test of differences among the independent coefficients alpha was statistically significant (χ42 = 10.38, p = .04) for the Fragmented and (χ42 = 11.58, p = .02) for the Cohesive subscales. Post hoc comparisons showed the difference ( F129,299= 1.50, p = .003) was between Australia and Nigeria for the former and ( F155,157 = 1.54, p = .004) between South Africa and the United States for the latter alpha values. A one-way analysis of variance, testing for homogeneity among means within each subscale, indicated that these were homogeneous because the measure of the strength of association accounted for 10% of variability. As reliability coefficients were from homogeneous samples and alpha values were not different, the combined reliability is the best estimate of the population reliability for each subscale.
