The article evaluates the effectiveness of pre-service training that focuses on collaborative consultation and positive behavior support for treatment of challenging behaviors. The effectiveness of an 8-month training program is evaluated for three participant groups: (a) 16 advanced undergraduate and master's-level students who received the training, (b) 16 classroom teachers who participated as consultees, and (c) 16 target children (4 to 10 years) who exhibited challenging behaviors that interfered with their learning.