A professional who reads typescript (original copy) or proof of type setup to detect and mark for correction any grammatical, typographical, or compositional errors, by either of following methods. Responsibilities include:

• (1) Places proof and copy side by side on reading board.
• Reads proof against copy, marking by standardized code, errors that appear in proof.
• Returns marked proof for correction and later checks corrected proof against copy.
• (2) Reads and corrects proof while copy holder reads aloud from original copy or reads proof aloud to copy holder who calls out discrepancies between proof and copy.
• May measure dimensions, spacing, and positioning of page elements (copy and illustrations) to verify conformance to specifications, using printer's ruler.