Strengths of Treatment Removal in Switching Replication

What is a major methodological advantage of the switching replication design?

Match each methodological strength of the switching replication design with the explanation of how it protects the study's internal validity.

A researcher is studying a new educational tool in a school setting. To strengthen the study's conclusions by using a built-in replication and ruling out external timing-related factors, they decide to roll out the tool to two different classrooms at different times. Arrange the following steps in the correct chronological order to successfully implement this research strategy.

In a study using a switching replication design, if an extraneous environmental event (history effect) were the actual cause of an improvement observed in the first group, the researcher would expect the second group to remain stable and unchanged until its own later treatment rollout.

According to the methodological characteristics of the switching replication design, which internal validity threat is ruled out by the delayed rollout of the intervention?

Because the delayed rollout of the intervention in a switching replication design effectively rules out history and maturation effects, it also eliminates the need for researchers to account for persistent internal validity threats such as placebo effects and demand characteristics.

A researcher is critiquing a study that used a switching replication design. They argue that although the treatment effect was successfully replicated across two groups at different times, the study's internal validity remains questionable because participants likely guessed the researchers' hypotheses. This critique identifies that the design lacks inherent control over _____.