Table 3 Study designs found in each clearinghouse review

Group designs

^a

 Randomized controlled trial (RCT)

x

x

 Sequential multiple assignment randomized trial (SMART)

x

 Quasi-experimental design (QED)

x

x

 Regression discontinuity designs (RDD)

x

x

Single-subject designs

 Withdrawal of treatment (ABAB)

x

x

x

 Concurrent multiple baseline

x

x

x

 Multiple probe

x

x

x

 Alternating treatments

x

x

x

 Changing criterion design

x

x

x