The internal validity of the Pre-post designs is threatened by threats related to time.

Question

Quizplus · Accepted Answer

Pre-post designs rely on the assumption that there are no other important events or changes happening in the time between pre-test and post-test. Therefore, any events that could affect the outcome during this time (e.g. historical events, maturation, or regression to the mean) can threaten the internal validity of the study.

The Internal Validity of the Pre-Post Designs Is Threatened by Threats