Which of the following is a common measurement used in ABA?

The chosen measurement, which involves observational logs and anecdotal notes, is a foundational element in Applied Behavior Analysis (ABA). This method allows practitioners to systematically record behaviors, environmental factors, and interactions over time, making it easier to analyze patterns and trends. Observational logs are particularly beneficial because they capture data in real-time, providing insight into a client's behavior in various contexts and helping to ensure that interventions are tailored to the individual's needs.

Anecdotal notes complement observational logs by offering qualitative insights into behaviors that may not be fully captured by more quantitative measures. These notes are critical for capturing the context and nuances of behavior, which can inform future interventions.

While other methods mentioned can contribute to the understanding of a client's behavior, they may not provide the structured and systematic approach that observational logs and anecdotal notes deliver. For instance, standardized testing can be limiting as it often measures specific abilities rather than the broader context of an individual's behavior. Video recordings without interpretation lack the analytic framework needed to derive meaningful conclusions, and subjective assessments by non-professionals may introduce bias and inconsistency, undermining the reliability of the data collected. Thus, having structured observational logs and notes is an essential practice in effectively measuring behavior within the principles of ABA.