ABAB Design is a research methodology used primarily in social sciences and education. It involves alternating between two phases: the "A" phase, where a baseline is established, and the "B" phase, where an intervention or treatment is applied. This design helps researchers observe the effects of the intervention by comparing data from both phases. The structure of ABAB Design allows for repeated measurements, enhancing the reliability of results. After the initial intervention, researchers return to the baseline phase to assess whether the changes observed during the intervention phase are consistent and replicable, providing valuable insights into the effectiveness of the treatment.