The Lidcombe program is popular in several countries. I don't know how much you know about the program, but studies have shown that the verbal contingencies has no or little effect on the outcome of the treatment. they discuss the findings of the study in this podcast:[https://stuttertalk.com/what-exactly-is-working-in-preschool-stuttering-treatment-ep-701/](https://stuttertalk.com/what-exactly-is-working-in-preschool-stuttering-treatment-ep-701/) Edit: Because of this we chose not to do the lidcombe program for our son. We started the Palin PCI program and are now transitioning to "Mini-kids".