Final answer:
The baseline phase in a reversal replication design should continue until stability in baseline measures is observed, ensuring that the behavior studied is stable before intervention.
Step-by-step explanation:
The baseline phase of the reversal replication design should continue until stability in baseline measures is observed. This involves collecting sufficient data to ensure that the behavior being studied is stable and not influenced by external factors. Achieving stability is critical before proceeding to intervention phase to make sure that any changes in behavior can be more confidently attributed to the intervention itself.
It is important that adequate and representative replication of the statistical unit of measure is planned from the start of the study. This ensures that the results will be reliable and valid. Additionally, researchers must acknowledge the high probability that results will vary depending on the spatial and temporal scale of the investigation, reinforcing the need for a stable baseline before intervention.