Parent inclusion in Early Intensive Behavioral Intervention: The influence of parental stress, parent treatment fidelity and parent-mediated generalization of behavior targets on child outcomes

► Parent treatment inclusion does not increase the parental stress levels. ► High level of staff treatment fidelity reduces the parental stress levels. ► High level of parent treatment fidelity predicts a better child outcome. ► Parent training and constant parent-mediated treatment provision reduces challenging behaviors.