No matter how experienced you are, your writing will always benefit from revision. If possible, put the writing away for a while; this will help you to come back to it with a fresh eye. Often, mistakes will leap out at you after a break:

• See Clear and appropriate language for common problems in writing. Fix these wherever they occur.
• Look for errors of grammar (set your word-processing program to identify them). Again, fix these where appropriate. (But do not follow the program blindly! It can make mistakes.)
• Read your work aloud. This is useful for picking up long sentences, convoluted phrases and nonparallel constructions. It also helps you to see whether the tone is appropriate for the audience.
• Sum up each paragraph in a few words. This technique is useful for checking that each paragraph contains only one major idea; it also helps to show whether the content flows logically. If you do the summing up in a separate document, you can move the ideas around more easily, which can be useful in finding the most logical order.
• Take care to re-read anything you have changed, because changes in one place often require changes in another.
• Print out your document before signing off on it. Errors that you do not notice on screen often leap off the physical page, and you will wonder how you missed them. You can even try putting a ruler underneath each line as you read it to focus your full attention on that line of text.