Answer:
ABAB design
Step-by-step explanation:
This method used in the field of research on Behavior Modification consists of four phases:
1. Phase A: Stable patient.
2. Phase B: Introduction of treatment.
3. Second Phase A: Withdrawal of treatment before consolidation.
4. Second Phase B: Reintroduction of treatment
This allows to verify the reliability of the change produced by the treatment. If it produces a new behavior change, we would have more evidence that the cause of the change is treatment.