Verification: One of three components of the experimental reasoning, or baseline logic, used in single-subject research designs; accomplished by demonstrating that the prior level of baseline responding would have remained unchanged had the independent variable not been introduced. Verifying the accuracy of the original prediction reduces the probability that some uncontrolled (confounding) variable was responsible for the observed change in behavior.  Applied Behavior Analysis (2nd Edition)

Scenario:

  • Target Behavior: A child engages in frequent tantrums (e.g., screaming, hitting, throwing objects) during transitions (e.g., leaving playtime, going to bed).
  • Intervention: The child is taught a visual schedule to indicate the upcoming transition and is provided with choices within the transition (e.g., “Do you want to turn off the lights yourself or should I?”).

Verification Phase:

  1. Intervention is Removed: After the tantrums have significantly decreased during the intervention phase, the visual schedule and choice-making options are temporarily removed.
  2. Data Collection Continues: The frequency and intensity of tantrums are carefully monitored during this phase.
  3. Expected Outcome: If the intervention was truly effective, the frequency and intensity of tantrums should increase back towards baseline levels when the intervention is removed.

Why is this Verification?

  • Demonstrates Causality: By removing the intervention, the researcher/therapist can demonstrate that the changes in behavior were directly caused by the intervention and not by other factors (e.g., chance, maturation).
  • Increases Confidence: Verification strengthens the confidence that the intervention is effective and reliable.

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ABA Terms