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Results
#1. Jay, a newly certified BCBA, has been working with a client on independent dressing skills for several weeks. The client is now consistently dressing himself without assistance. However, Jay’s supervisor observes that the client’s improvement was likely due to the client watching YouTube tutorials on dressing and his parents providing intensive practice at home, rather than Jay’s specific intervention plan. Given this information, what critical aspect does Jay’s intervention lack, and why is this problematic in an ABA context?
Internal validity is a fundamental concept in experimental design within Applied Behavior Analysis ABA referring to the extent to which an experiment demonstrates that changes in the dependent variable the clients behavior are directly attributable to the independent variable the intervention and not to extraneous variables In this scenario the supervisors observation suggests that external factors YouTube tutorials parental practice are more likely responsible for the clients improved dressing skills rather than Jays specific intervention This means that Jays intervention lacks internal validity because experimental control was not established other variables confounded the outcome making it impossible to confidently conclude that the intervention caused the behavior change Without internal validity the effectiveness of the intervention cannot be credibly determined External validity in contrast refers to the generalizability of findings to other settings people or behaviors Social validity pertains to the social significance of the target behavior the appropriateness of the procedures and the social importance of the results Observer validity or interobserver agreement relates to the consistency and accuracy of data collection by multiple observers None of these align with the problem of not being able to attribute the behavior change to the specific intervention
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