Definitions for "Author's Alterations"
(A.A.'s) Author or client corrections and/or changes made in type at the proof stages; these are not due to the typesetter's error and are therefore chargeable to the customer. All corrections should be marked according to the printer's code of standardized proofreader's marks, in pen or colored pencil, never in soft lead. A.A.'s are expensive and should be kept to a minimum. See also Printer's Errors (P.E.'s).
author or client's changes during proofing process - these are not due to the error of the typesetter and are applicable to charges. As opposed to Printer's error.
Changes in copy or artwork after it has been typeset and sent to the printer, often called AAs. These types of changes frequently cost extra; the additional costs incurred by AAs are charged to the client, not the printer.