A new approach is presented for the meta-analysis of data from pre-test/post-test designs. With this approach, data from studies using different designs may be compared directly and studies without control groups need not be omitted. The approach is based on a "standardized mean-change" measure, computed for each sample within a study,…

Analyses of the results of 23 reports on coaching for the Scholastic Aptitude Test (SAT) indicated that, on the average, coaching can help increase SAT scores. The considerable variability in the results of 48 studies reflected the many factors influencing coaching effectiveness and the wide variety of study designs. (SLD)