This job contemplates why a writer should devote one-third of his or her time to revising, editing, and proofreading. Why are revising, editing, and proofreading so important? What is the difference among the three terms? These questions are considered.
Part 1-- Why the terms are important.
Consider that the primary goals of writing are two 1) convey a message and 2) ensure that the reader understands the message. If you agree, than the primary function of the Revision Phase (revising, proofreading and editing) is to ensure that your message is clear and understandable. Did you say what you meant to say? Will others be able to understand your intent?
I believe the first two questions posed in your assignment can be answered in the above. If 1/3 of a writer's time is devoted to planning-- brainstorming, creating an idea, etc.-- and another 1/3 to the actual writing, shouldn't equal time be spent making sure that Steps 1 and 2 were planned and executed appropriately? I believe the answer is yes. In other areas of your life, you wouldn't complete a large project and then fail to check it's ability to do the job. Imagine building a deck, but not testing to make sure it was stable. That doesn't make sense. Writing is no different.
There are at least a couple of views on the purpose of revision. (At this point, I'm considering "Revision" as an all encompassing term for revising, proofreading and editing. I will move on to each term ...