The changes in the governing structure and society that occurred in the mid-11th century were countermeasures taken by kokuga side (public land side) in order to counter shoen (manor in medieval Japan), which were rapidly increasing at the time and proceeding with ichienka (realization of complete ownership).
11世紀中期に見られた体制変化・社会変化は、当時徐々に一円化を進め、著しい増加を見せていた荘園に対抗するための国衙側（公領側）の対応策であった。