This guide is an essential reference for manuscript editors (substantive and mechanical editors), proofreaders, and production editors. It is a supplement to other editorial references, in particular, The Chicago Manual of Style, 16th edition, and Merriam-Webster's Collegiate Dictionary, 11th edition. It focuses on issues specific to the World Bank for which the Chicago manual provides multiple choices. The professional recommendations made in this guide are designed to ensure that every publication achieves an appropriate standard of professionalism, to ensure stylistic consistency across all World Bank publications, and to increase efficiency in the production process.