From Reinhardt: "The Pivot System
is a scientific, practical, proven method of producing the utmost in range, power, endurance and flexibility on the trumpet, trombone and all other cupped-mouthpiece brass instruments. It was originated not only through forty years of research and experimentation in practical playing, teaching, writing and lecturing to many thousands of professionals, semi-professionals, supervisors, teachers, students, etc., but also through designing and producing personalized mouthpieces and being consultant of instrument design for several leading manufacturers of brass instruments.
This system, working on tried and tested principles, first of all analyzes and diagnoses the physical equipment of the player and then presents a specific, concrete set of rules and procedures which enable the individual to utilize, with the greatest possible efficiency, the lips, teeth, gums, jaws, and general anatomy with which he is naturally endowed. The study of the Pivot System is absolutely essential for all brass instrument performers because strict adherence to a musical approach deprives the student of basic mechanical necessities which are vital to his uninterrupted improvementon the instrument." (Reinhardt, Encyclopedia of the Pivot System, 1973)