I first realized the truth of this back when I was training astronauts. There were huge changes that I sometimes had to make from one to the next, even to the point that I prepared some different materials for some of them. Two examples: Wendy Lawrence was very much a by-the-book learner; she was careful to go through the material in order and she kept immaculate notes. David Wolf, on the other hand, was very much a tactile learn-by-doing guy; he almost seemed to absorb knowledge through his fingertips. There's a Latin/Rhythm instructor here who used to compete as a junior before he blew out his knee; he can still burn holes in the floor, and he's an excellent teacher. But I know from past experience that his teaching style and my learning style just don't mesh. It isn't anything he is doing wrong; I can't exactly explain the problem, but I always used to leave his lessons feeling overwhelmed and discouraged. So I don't take lessons from him anymore. But I still recommend him to other students, because I know that my experience with him was not typical.