Something my parents once told me when I was a lot younger: >"Focus on the people you are having a conversation with and things you are talking about, NOT how you are talking / if you are fluent. The less you emphasize on your speech and on the topic, the more fluent you become. " I generally manage my stutter just by doing this, and it worked very well most of the time, except when I was extremely distressed perhaps. ***Linguistic techniques do help, but they only help so long as I can keep calm and focus on my topic and the other person.*** If I am talking calmly and focused and I had a block, I can quickly recover from it with a cancellation/slide-out and continue on with fluency. But, if I am sweating all over and horribly nervous, no amount of technique will stop me from blocking on every sentence. ​ (Note: it may or may not work, as everyone is different, and it also depends on his mental state and techniques. Does he panic after a block? Does he have low self-esteem? Is he ready for "field training"? I am just pointing out something that helped me a lot in the past, but it may not work on him)