It is the primary historical material used in Kamakura period research, although some of the dates were compiled inaccurately, and there are also misrepresentations in its writing done to justify the Hojo-Tokuso family, the main line of the Hojo family.
年を間違えて編集している処、また北条得宗家の正当化の為の曲筆など注意が必要なものの、鎌倉時代を研究する上での前提となる基本史料である。