Kuji had been carried on based on the decree such as 'Engishiki (an ancient book for codes and procedures on national rites and prayers)' or various official or personal ceremonial books regarding 'Jogan gishiki (ceremony in the manner of Jogan period)', 'Saikyuki (record of court practices and usage, written by MINAMOTO no Takaaki in Chinese style)' or 'Hokuzansho (a representative book of ceremonies for the Heian period written by FUJIWARA no Kinto)' by court nobles including shokei (court nobles who work at Imperial Court as high rank post) who served as bugyo (administrator), and government officials such as Benkan (a controller of the Oversight Department), Geki (Secretary of the Grand Council of State) and Shi (recorder) (the risturyo system) who provided with clerical assistance, under the sponsorship of Emperor or Chiten no kimi (the retired emperor in power).
公事は天皇または治天の君を主催者として上卿と呼ばれる奉行（運営責任者）を務める公卿を中心とした公卿とこれを事務面で補佐する弁官・外記・史(律令制)などの官人が『延喜式』などの法令や『貞観儀式』や『西宮記』・『北山抄』に対する公私各種の儀式書に基づいて行われてきた。