In this study, Ridgway et al. found mixed results, depending on the assessment test used. With the Balanced Assessment (BA) test, positive significant differences were found between the Connected Mathematics Project (CMP) students and non-CMP students in grades 6, 7, and 8. The results for the Iowa Test of Basic Skills (ITBS) were less favorable in the CMP group, with results ranging from negative significance in 6th grade to nonsignificance in the 7th and 8th grades. Since the analysis was done at the student level while the level of intervention assignment was done at the classroom or school level, caution should be used in interpreting the results.