PMTS is the only system in the world that offers this approach. The reason that only PMTS has this ability to offer one technique is because it's biomechanically sound. All other systems are contrived skidding and leg twisting approaches. In addition, they teach extension and up movements, which no expert skier uses in all terrain. So you become a limited skier using any of the national ski school techniques. I am posting links to my blog demonstrating how i use only one technique for every condition. These are also on my Facebook Page and in the "Performance Skiing" DVD.
http://harbskisysems.blogspot.com/2015/09/skiing-new-powder-untracked-with-same.html