Definition
Interobserver Agreement (IOA) is a quality control metric for behavioral data. Two observers score the same session independently and agreement is calculated. Common forms include total count IOA, mean count-per-interval IOA, exact agreement IOA, and trial-by-trial IOA.
Most ABA programs target ≥80% IOA on at least 33% of sessions. IOA below that threshold suggests the operational definition is unclear or scoring procedures need recalibration.