Glad to hear you've contacted someone 👍 The lidcombe program is based on evidence and does have a positive effect for many.However some research suggest that the main component of the program has no effect, the verbal contingencies. Verbal contingencies is basically praising fluent speech and commenting in a positive tone that stuttered speech was "a bit bumpy". [https://www.stutteringtreatment.org/blog/lidcombre-program-whats-left](https://www.stutteringtreatment.org/blog/lidcombre-program-whats-left) On this podcast of "stuttertalk" they discuss the study: [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/) If that's the case, then what's actually making the program work? Probably the indirect parts of changing the environment around your son. But it's only one study, and i'm no expert for sure. Here's the guide made by the Lidcombe people: [https://www.uts.edu.au/sites/default/files/2021-04/Lidcombe%20Program%20Treatment%20Guide%202021%20v1.3%202021-04-27.pdf](https://www.uts.edu.au/sites/default/files/2021-04/Lidcombe%20Program%20Treatment%20Guide%202021%20v1.3%202021-04-27.pdf) Under the heading "Maximising stutter-free speech" it's a list of more classical/old school approaches to indirect treatment. Good luck to you too!