A reversal design (ABAB) involves
a. Gathering data during an initial or baseline (A) phase when the variable of interest is not present
b. Conducting a second treatment or manipulation (B) phase in which the event or situation of interest is present
c. Repeating the alternation of these baseline and manipulation conditions to establish a clear pattern showing the
relationship between the variable manipulation and changes in levels or rates of problem behaviors
d. All of the above
d
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