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Results

#1. A BCBA implements a new token economy system to increase independent dressing skills in a client. After several weeks, the client consistently dresses independently. However, the BCBA later discovers that the client’s parents had simultaneously started a highly effective reward system at home for independent dressing, which was unbeknownst to the BCBA. In this situation, the BCBA’s intervention specifically lacks which critical element of experimental rigor?

External validity

Interobserver agreement (IOA)

Treatment fidelity

Internal validity

Internal validity refers to the extent to which an experiment demonstrates that changes in the dependent variable are due to the independent variable the token economy and not to uncontrolled extraneous variables or confounds When a BCBAs intervention appears to produce a behavior change but an unmeasured or uncontrolled factor like the parents concurrent reward system is actually responsible for or significantly contributed to that change the study lacks internal validity This means the experimenter does not have functional or experimental control over the behavior as the observed change cannot be confidently attributed solely to the intended intervention External validity refers to the generalizability of findings to other settings people or behaviors Interobserver agreement IOA relates to the consistency of measurement between two or more observers Treatment fidelity or procedural reliability concerns the accurate and consistent implementation of the intervention as planned

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