I've had a few jobs recently from clients who have asked for their documents to be proofread, yet have really been expecting a copyedit, and it's obvious from this that there is some confusion about the two processes.
Definition of Proofreading
Proofreading means reviewing a textual document checking for
Definition of Copyediting
If you are asked to perform a proofread, it may be worth checking with the client first to make sure they know what they are getting. If it turns out that what they really want is a copyedit, then you should revise your cost for the project upwards.
For more information regarding what is involved in Proofreading and Copyediting or if you are looking for someone to perform these tasks, then it is worth visiting the Society for Editors and Proofreading website.
I am a Copywriter, Proofreader, Virtual Secretary and Author.