Randomized Comparative Change Design
Randomized comparative change design is an experimental design in which a treatment and control group are randomly selected for study. Both groups are administered a pre-test. The treatment group is given the treatment, while the control group is not. Both groups are tested or measured after the treatment. The test results of the two groups are compared. The pretest allows a check on the randomization process, and allows for control of any differences found.
US Environmental Protection Agency. (2007). Program Evaluation Glossary. Office of the Administrator/Office of Policy/Office of Strategic Environmental Management/Evaluation Support Division.