A Serious Problem of Interpretation Can Arise in the ABAB

Multiple Choice

A serious problem of interpretation can arise in the ABAB design when

A) performance in the second baseline period does not reverse, that is, return to the level in the initial baseline period.
B) performance in the initial baseline period is too high or too low.
C) performance in the second baseline period is worse than it was in the initial baseline period.
D) performance improves to the same degree in both intervention periods.