The proposed study is an adaptive intervention trial that will focus on tailoring supports for new JASPER interventionists. Coaching and training supports will be provided by Local Senior JASPER Trainers will support the development of new interventionists. Based on the interventionist's individual response to the coaching/training supports, a change in support may be provided at a priori time points including end of month 1 (training case) if at least 70% fidelity is not reached, and at end of month 4 (midpoint of first child cohort), at least 90% fidelity is not reached.