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In this paper we provide an appraisal of the scientific foundations of theOlympic sport "judo" from a Western perspective, i.e. a biomechanicalreassessment of the basic teaching tools of the foundations of Jigoro Kano'sKodokan judo. The core of judo functional organization is the triad made up bythe "Kuzushi-Tsukuri-Kake" movement. Kuzushi (unbalance), tsukuri (entry andproper fitting of Tori's [the actor] body into the position prior to thethrowing phase), and kake (execution of the judo throwing action) occur as oneeffective movement without separation. Biomechanical analysis is able tobroaden and deepen these steps proposed by Kan\=o, who for didactic reasons hadseparated the whole movement into three steps, as was pointed out previously byold Japanese biomechanical studies. The results of our biomechanicalreassessment support: The importance of broadening the unbalance concept to thedynamic situation.Singling out the existence of two classes of paths andtrajectories called "Action Invariants". The first, "General ActionInvariants", are connected to the whole body motion for shortening the distancein the kuzushi/tsukuri phase; the second one, the "Specific Action Invariants",are connected to the superior and inferior kinetic chains motion and rightpositioning connected to both the kuzushi and tsukuri phases.The existence oftwo basic physical principles of throwing in according to a newclassification.In a clear way the basic mechanical steps of all throws, andalso show hidden connections, similarities and differences among judo throwingtechniques, making this reassessment particularly useful from a didactic pointof view. Demonstrate that this biomechanical approach is also able tounderstand how new and innovative technical variations are born.Ourreassessment helps clarifying his concept and facilitates teachers and coachesin their professional work.

A Biomechanical Reassessment of the Scientific Foundations of Jigoro Kano's Kodokan Judo