Production Editor/Coordinating Editor
These editors function between both editorial and production (design, composition) departments. Production editors typically take over a project once all development is complete. They will hire and coordinate the work of copy editors and proofreaders, in addition to assuming responsibility for passing completed, approved art and photo manuscripts to design and composition colleagues. These editors often have advanced technical skills.
The job that everyone seems to acquaint with editing is the copy editor. This person will ensure that there are no grammar, spelling, or punctuation mistakes. Often copy editors will act as fact checkers by researching and checking on titles, people, and places cited in a text.
This editor begins his or her work once a text has been copy edited and designed and the pages have been formatted. The proofreader's task is to ensure that all changes from the copy edit have been made accurately. The proofreader is the last person to read the text before it enters final page composition.
Editing Roles in Corporations and Government
Editing outside of publishing tends to be less developmental in nature and will often resemble what in publishing would be considered copy editing. There are exceptions to this rule, though, and that is most evident in businesses such as pharmaceuticals, where editors will often be required to have complementary education and/or work experience.
If you re-read your work, you can find on re-reading a great deal of repetition can be avoided by re-reading and editing.