The scenario involving Tonys restaurant perfectly illustrates control the highest level of scientific understanding in Applied Behavior Analysis which builds upon description and prediction A Description This is the most basic level involving objective observations and recording of events without attempting to explain causeandeffect relationships Tonys initial observation of increased profits could be a description but the full scenario goes beyond merely observing B Prediction This involves inferring a correlation between two events suggesting that if one event occurs another is likely to follow Tonys initial belief that providing free bread will increase profits is a prediction The scenario however provides empirical evidence that validates or refutes this prediction through active manipulation C Control This level is achieved when a functional relation is demonstrated A functional relation means that a specific change in an independent variable the intervention in this case providing free bread reliably produces a specific change in a dependent variable the outcome increased profits and that the change in the dependent variable is unlikely to be due to extraneous factors Tonys experience though unplanned resembles a reversal ABAB design profits increased when bread was offered and then decreased when bread was withdrawn This consistent pattern strongly indicates that offering free bread is the causal factor influencing profits thus demonstrating experimental control over the phenomenon D External validity This refers to the extent to which the findings of a study can be generalized to other settings populations or conditions eg whether the free bread strategy would work in other restaurants While important for the broader applicability of research external validity is not what is being directly demonstrated within this specific scenario of Tonys restaurant rather the scenario focuses on establishing the causeandeffect relationship in his own business