Proofreading in the workplace is essential to productivity and growth. The appearance of even the smallest errors in business writing can dissuade potential clients, customers, or employers from supporting your company or considering you for advancement. Basically, good proofreading skills can generate revenue while bad proofreading skills will cost you money. Why? Errors convey a level of carelessness that make people distrustful of the quality of service they might receive. So, to avoid losing important opportunities, you must improve your ability to spot and correct mistakes. Based on the business writing style guide—The Gregg Reference Manual (11th Edition)—Business Proofreading: Essential Rules & Practice focuses on the mechanics of editing ten key areas of workplace writing by providing style rules and quiz exercises to encourage comprehension and practice.