In the actual work of compiling history books, the office work was done by establishing the institution (Senkokushisho [History Compilation Bureau]) (and official documents and records which were necessary for compiling history books were collected in Naiki [secretary of the Ministry of Central Affairs] or Geki [Secretary of the Grand Council of State], which was the reason why Zushoryo did not involve with the work of compiling history books).
実際の撰史事業はその都度機構（撰国史所）を設けて事務を行っていた（また、撰史に必要な公文書・記録類が集められたのが内記や外記であったということも図書寮が撰史事業に関わらなかった理由として挙げられる）。