The document outlines the USPS tabbing guidelines for self-mailers and booklets effective January 5, 2013, explaining the distinctions between a mailer and a booklet and detailing the requirements for automated mailing and postage discounts. It includes specific instructions for tab placement based on the type of mailpiece, such as folded self-mailers and various booklet configurations. Compliance with these guidelines is crucial for ensuring lower postage rates and proper mailing of promotional materials.