I suggest cooperation between me (private person) and company expecting training, consulting etc. in form of specific-task contract or mandatory contract. Someone may argue that this is not my main activity, and therefore I cannot guarantee good quality. But I can answer: "I do what I like and I like Six Sigma and Lean." Workinig with consulting companies (with all respect to their knowledge and to what I have learned from them) make me feel like salesman. I prefere to do less training but on my way.
I do not sell training. I help in knowledge acquisition.