For me, the proof was in the advancement of my speech. I wouldn't see, any other way how the technique would fail on me, other than lack of mechanical speech or lack of practicing or challenging feared situations. I can always look back whenever I begin to doubt the programme at my 2 videos, the beginning, where I couldn't say a word and my public speech out on the street, where I spoke confidently and comfortably, not a talk even most eloquent speakers would do. For me, that'll always be enough inspiration to keep going. The real bottom line, for me at least, is that I know this works for me, I've proven it to myself and I believe if I could speak well and controlled in front of random passer bys and 100 people in a room - With practice, I'm positive It'll work. And I believe the same for anyone who is yet to try the programme.