Which term describes the degree to which two or more independent observers report the same observed values after measuring the same events?

• A. Interobserver Agreement
• B. IRT
• C. Limited Hold
• D. Magnitude

Answer: (A)

Interobserver Agreement measures how consistently multiple independent observers record the same events. In ABA data collection, IOA helps verify that measurements are reliable and not dependent on a single observer. It's typically calculated by comparing records across observers for each event or interval, then computing the percentage of intervals or events where they match. For example, if two observers code a target behavior across 20 intervals and agree on 16, IOA would be 80%. Higher IOA indicates more reliable data and confidence that observed changes reflect actual behavior rather than observer error. The other terms don’t describe this reliability between observers: item response theory is about modeling test performance, limited hold is a procedural criterion defining how long a response remains eligible, and magnitude refers to the size or intensity of a response.