Proofreading
Proofreaders read printed
copy, also called proofs, to find and mark errors.
Sometimes proofreaders compare proofs to the original
copy and mark any differences they find. In that
type of proofreading, they may employ someone
else to read the original copy aloud while they
compare the proofs.
In another proofreading
method, proofreaders read the copy without anything
to compare it to. They mark errors in grammar,
spelling and punctuation. In both cases, copy
is marked with standard proofreader marks.