Students with extensive support needs are at risk of demonstrating challenging behavior due to inadequate support of their individual needs or class-wide factors such as low quality of instruction. Students with extensive support needs are also among the students who are most likely to experience aversive interventions and be placed in segregated…

The regression discontinuity design (RDD) has the potential to yield findings with causal validity approaching that of the randomized controlled trial (RCT). However, Schochet (2008a) estimated that, on average, an RDD study of an education intervention would need to include three to four times as many schools or students as an RCT to produce…