The copy holder follows the original copy word for word as the proofreader reads the proof aloud. The copy holder calls attention to differences between the proof and the copy. In other cases, the copy holder reads the original copy to the proofreader. Braille proofreaders check proofs of Braille transcriptions against original scripts to detect errors. They mark proofs for correction.
Blind proofreaders listen to readings or recordings of the original script.
Sighted proofreaders read or listen to the original scripts and compare them with the proof. Braille proofreaders slide their fingers over the Braille characters to feel discrepancies in the proof. They use a Braille stylus or pencil to correct errors, using standard printersmarks. Checkers are proofreaders who perform routine checking duties to make sure recorded data are accurate. They compare information or figures on one record against the same data on other records.