The 20 year period between 1973 -1993 was the Ninjutsu period which dealt with laying the foundation of the art.
The fundamentals of Ninjutsu were imparted through the Ten Chi Jin Ryaku No Maki which is an amalgamation of all the fore-mentioned schools integrating all core fundamentals, principles, concepts, and technical proficiencies.
The Ten Ryaku No Maki deals with all the principles and technical ability to develop the very special footwork used in The Bujinkan.
The Chi Ryaku No Maki deals with the actual technical ability in combat. It covers escapes, throws, locks, chokes, holds, suppression techniques and various kicking concepts. The Chi Ryaku No Maki addresses within this framework the biomechanical aspects of combat.
The Jin Ryaku No Maki combines in a flow the Ten and the Chi and has specific techniques from the various schools to illustrate key concepts.
The essential idea of the Ten Chi Jin Ryaku No Maki is to help the Budo practitioner unlock his own natural movement. The Ten Chi Jin also prepares the diligent practitioner in being able to grasp the next echelon in the Bujinkan’s evolution; NinpoTaijutsu.