The one-group before-after design,or one-group pretest-posttest design,eliminates possible pretest reactivity by studying both an experimental and a control group after the experimental group has been exposed to some treatment.

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The one-group before-after design, or one-group pretest-posttest design, does not include a control group; it only involves observing the same group of subjects before and after an intervention, which does not eliminate possible pretest reactivity or other confounding variables.

The One-Group Before-After Design,or One-Group Pretest-Posttest Design,eliminates Possible Pretest Reactivity