Once the manuscript has been typeset, you will be sent proofs for review. At the same time, a professional proofreader will be checking a duplicate set of the proofs against the copyedited manuscript. At this stage, you are expected to examine the pages carefully. Keep an eye out for factual errors, in particular. Because you are more familiar with the subject matter than anyone else working on your book, you may catch errors that the proofreader could miss. Be sure that every part of the manuscript has been typeset in the proper place.

Only the following changes may be made after typesetting: misspellings and typographical mistakes, serious grammatical mistakes, corrections of factual errors, and the most necessary revisions to update your material. If updating is absolutely necessary, adding a short paragraph at the ends of chapters and/or a postscript at the end of the book are often the best solutions.

All changes to correct errors that existed in the manuscript are considered author's alterations, and you will be held responsible for the costs of such alterations. As the cost of changes in typeset proofs is high, it is imperative to keep such changes to an absolute minimum. Remember also that making changes in type is time consuming, and publication is likely to be delayed if many changes are requested.