What is letterboard method and how does it work?

I LOVE letterboard method because it takes into account an autistic individual's motor and sensory challenges on a deeper level. It speaks to the capable mind. Here is a segment on Soma, the lady who developed RPM (rapid prompting method/letterboard method). https://youtu.be/Nfiap3a7Tuo. Here is her website if you'd like to read more about RPM https://www.halo-soma.org/ If you have any questions at all, please reach out to me at my Email: enphaseintune@gmail.com or on Facebook or Instagram. Feel free to check out my website as well https://www.enphaseintunewithautism.com/