You're probably missing at least a dozen. Any of them work IF you do them correctly and consistently. If you make mistakes with them then they won't work nearly as well. That is the major problem with the DVD trainers. Knowing how is not enough. You need to know why and figure out when and when can differ from horse to horse. I like Ray Hunt and Buck Brannaman. Ray is dead now but he is the creator of the horse "clinic". They did not exist until he started doing them. Buck is a no-nonsense cowboy from Montana. He doesn't sell a catalog full of specialty crap and there is no DVD course that you can do to get a worthless certificate.
Hmm.... have to agree with Kevin here it has worked for me but there has been alot of wrong done through people doing parelli wrong towards their horse but as in most equestrian disciplines and such it is best to have an instructor to help you.
Seriously, if you try to pigeon hole and fit your horse into a single program and NEVER deviate, you're going to be a horseman with very limited skills. If you can adapt, take a step back and go "okay, lets try THIS...." then you're going to learn more. It might all be hit-or-miss type learning, but I think that's the best kind.
If theres one thing that I don't like about Parelli (not bashing just reflecting) its that there are only four personalities that a horse can posess. Sure, most horses will fit into one category 99% of the time, but what about the other 1%? Then you're left scratching your head saying "well that's not right". Its like trying to evaluate someones personality based on their astrological sign....generalizing can only get you so far before you hit a wall.
I agree with kevin, I've read some of Buck Brannaman's stuff and I like what he has to say. He's certainly not as charismatic as Clinton Anderson or some of the others, but he's not out to sell any DVD's either.