Proofread and correct your research paper carefully before submitting it. If you are checking a printout and find a mistake, reopen the document, make the appropriate revisions, and reprint the corrected page or pages. Be sure to save the changed file. Spelling checkers and usage checkers are helpful when used with caution. They do not find all errors and sometimes label correct material as erroneous. If your instructor permits corrections on the printout, write them neatly and legibly in ink directly above the lines involved, using carets (⁁) to indicate where they go. Do not use the margins or write a change below the line it affects. If corrections on any page are numerous or substantial, revise your document and reprint the page.