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Research
Seventy-nine studies reviewed by the WWC investigated the effects of CMP. One study (Schneider, 2000) is a quasi-experimental design that meets WWC evidence standards with reservations. The remaining 78 studies do not meet either WWC evidence standards or eligibility screens.
Meets evidence standards with reservations
Schneider (2000) conducted a quasi-experiment to assess the impact of CMP on middle school math achievement in Texas. Twenty-three CMP schools were matched with 25 comparison schools that did not implement CMP. The analysis sample included three cohorts, but the WWC reports the results for only cohorts 1 and 2 because the study did not establish baseline equivalence for cohort 3. The CMP intervention began when students were in the sixth grade. Cohort 1 consisted of more than 3,000 CMP students and 2,600 comparison students; cohort 2 consisted of more than 3,400 CMP students and 2,900 comparison students.
Extent of evidence
The WWC categorizes the extent of evidence in each domain as small or medium to large (see the WWC Procedures and Standards Handbook, Appendix G). The extent of evidence takes into account the number of studies and the total sample size across the studies that meet WWC evidence standards with or without reservations.6
The WWC considers the extent of evidence for CMP to be small for math achievement.