PII involves modeling, coaching, and collaborating with parents in the process of training parents to implement evidence-based practices (EBPs) throughout daily routines and activities with their children with ASD.  

Practitioners should use parent implemented interventions (PII) to train and coach parents to implement EBPs with their children throughout daily routines and activities.  Parents are the primary implementers of PII, however, practitioners play a crucial role as the coach, encourager, and information provider.