Revision is not simply proofreading and editing. That is, the act of revising is more than correcting surface errors or rearranging paragraphs. It requires a re-thinking of the ideas and organization of your paper as a whole. The difference between editing and revision might seem minute. Just remember, editing deals with more technical information, while revision focuses on ideas and organization of those ideas.
Revision creates order out of chaos.
Your objective when revising is to create a clearer expression of what you want to say. It does not mean that you have written a bad paper, it simply means that you can make it even better. Everyone, especially a person who writes professionally, needs to revise. When to revise Revision is not just a step between the rough draft and the final draft in the writing process. You can revise at any time, even while you are writing.