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Peer reviewedConrad, Kendon J., Ed. – New Directions for Program Evaluation, 1994
The 9 articles of this theme issue stem from a project on alcohol and drug abuse that involved 14 projects, 10 of which began with randomized clinical trials. These papers describe implementation problems associated with experimentation in field research and the focus on ensuring internal validity. (SLD)
Descriptors: Alcohol Abuse, Drug Abuse, Evaluation Methods, Experiments
Download full textOlejnik, Stephen – 1978
The measurement of change in quasi-experimental educational research was discussed. Problems related to measuring change exist to varying degrees in all research designs; these issues are less troublesome in experimental studies because the investigator can manipulate the interest variables and observe their effects on other variables. Measuring…
Descriptors: Achievement Gains, Comparative Analysis, Educational Research, Educational Testing
