A randomized pre-posttest control group design was used with 34 university students in consumer economics to investigate aptitude-treatment interaction under a computer assisted instruction (CAI) and text mode of programmed instruction. Findings indicated a relative advantage of CAI for the lower aptitude student. Sixteen references are listed.…

Discusses an adaptive diagnostic test used as part of an instructional program in signed-number arithmetic on the PLATO system. Findings indicated that differences in prior and subsequent instructional methods affected the learning of more advanced materials and produced lower achievement scores on posttests. Thirty-two references are listed. (MER)