Never make changes directly on the original document, either on the screen or on paper. As you move things about, change wording, or add and delete paragraphs, there is always the chance that you might decide you liked the original or an earlier version of the document better. Save a copy of your paper with a new name and date (such as 4/08revisedthesis.doc) and revise this copy instead.
If you are working on a really involved project, you may find yourself needing to work with fresh copy several times. To save your sanity, be twice as careful as usual about labeling each version. Place previous versions in separate electronic or paper folders and archive them in a location where you won't be able to work on the wrong one accidentally.
Was this article helpful?