Therefore, Omagaki became a target of study as Yusoku kojitsu (knowledge of court rules, ceremony, decorum and records of the past), and books to create Omagaki were made such as "Jimokutaiseisho" (book for perfection of Jimoku) (Omaseibunsho (book for how to write Omagaki)) by Yoshitsune KUJO, "Gyorogusho" by Kinkata TOIN and so on.
そのため、有職故実として研究の対象となり、九条良経の『除目大成抄（大間成文抄）』や洞院公賢の『魚魯愚鈔』など大間書作成のための書物が作成された。