Upon formation of various organizations overseeing martial arts, a problem of commonality appeared. Since members of the organization were drawn from various backgrounds, and had experience practicing different schools of iaido, there arose a need for a common set of kata, that would be known by all members of organization, and that could be used for fair grading of practitioner's skill. Two of the largest Japanese organizations, All Japan Kendo Federation (ZNKR) and All Japan Iaido Federation (ZNIR), each created their own representative set of kata for this purpose.