Problem
I.	Define internal validity and external validity according to ABA
II.	List the threats to internal validity.
III.	List 3 factors to consider when assessing the external validity of a study.
IV.	List one potential threat to internal validity in the article. (Look at limitations)
V.	List one potential concern related to external validity in the article. (look at Procedure details)
Article: Bohan, C., & Smyth, S. (2022). The Effect of Schedule Thinning on Student Behavior During the Caught Being Good Game. Behavior modification, 1454455221129993. Advance online publication.