What successful(as winning in the UFC) martial arts have in common: realistic sparring. BJJ(Brazilian Jiu-Jitsu), Boxing and Muay-Thai all have this(of course with certain restrictions) and they have shown to be effective.

Edit: translating to the rationality dojo, we need some method of empirically testing the techniques. One way would be to do some exercises after the theory was learned like asking some question or doing some test and then seeing who gets the answer right. Another would be to ask for real-life experiences like: what irrational believe or habit did you manage to get rid of in the last month/week? Where did you improve something?