The publisher Hitsuji Shobō gives its authors a guide to correcting proofs. The first proof is the shokō gera. The proof with its red corrections made is the saikō gera, and the next one the sankō gera. A proof sent at the end, just to make sure, is the nenkō gera.
Editors and proofreaders write their questions to the author in pencil on the proof. From the second proof on, the guide asks the author to check that the red corrections from the last round were made correctly.