By: Sir Khalid Rehman
 You get a text print as a galley proof or a page proof which is  required to be proofread. So you read the proofs closely to detect  typographical errors to be corrected before any printing is done. You  mark the corrections on the page for aother person to correct, or do the  corrections yourself on a computer. You have to do it so that the text  printed is exactly the same as the original manuscript. This is  proofreading.  A proof reader does not have the right to make any  corrections on his own. Any spelling, grammar or syntax error is to be  marked and referred back to the copy editor.
Having been read and  marked, proofs are returned to the typesetter (computer operator) or  graphic artist for correction (when you are reading the proofs of a  visual). Once the corrections have been made, a print is again made and  read once again. This re-reading goes on until all the proofs are error  free. The proofs read are signed by the person who has done the  proofreading with date (and also time if required).
Fast proofreading: Proof reading along  with copy holding (or copy reading), is a more quick method. It  requires two persons. The first reads aloud the text from original  manuscript. The second one listens and compares the composed (typeset)  text and marks any differences between the text read and the typeset  text.
Double proofreading: In this method, a  proofreader checks a proof in the traditional manner and passes it on to  a second reader who repeats the process. Both initial the proof. Note  that with both copy holding and double reading, responsibility for a  given proof is necessarily shared by two individuals.
More recently, the sub editors have to do all proofreading as well as correction on computers.
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