Pretest-posttest experimental designs are often used in randomized control trials (RCTs) in the education field to improve the precision of the estimated treatment effects. For logistic reasons, however, pretest data are often collected after random assignment, so that including them in the analysis could bias the posttest impact estimates. Thus,…

Aptitude-treatment interaction research is designed to identify significant disordinal interactions between personological variables and alternative instructional programs. This study was designed to investigate the efficacy of the aptitude treatment interaction design to research seeking to identify differential educational payoff of alternative…

Research was conducted to evaluate the effectiveness of a 12-week intervention program of individual instruction for disadvantaged preschool children. Based on this pretest, 17 children with IQ scores of 107 or less were selected and placed into experimental and control groups. The experimental group was exposed to individual cognitive and…

Three kindergartens and one prekindergarten, totaling 213 children, participated in a Behavior Modification program during the 1971-72 school year. A research assistant in each location worked directly with the teacher in measuring and evaluating teaching methods and in developing alternative procedures as needed to teach the same skills or…