The Gao style system is referred to as the Gao Yisheng branch of the Cheng Tinghua system of Baguazhang. Essentially Gao Style Baguazhang is a unique subsystem. The Gao style system, because of Gao's own martial progression over time, can be found to have a number of different permutations, represented in various lineages. All are valid examples of Gao Style Baguazhang because they all represent Gao Yisheng's progression as a martial artist. Not all of the lineages have all of the levels. Gao was refining and creating sets until he died. He changed his straight line, pre-heaven and weapons sets more than once in his life, but at its core it is a complete Baguazhang system.