This document provides guidelines for designing effective dialog boxes in applications. It discusses the different types of dialogs including modal and modeless, and their appropriate uses. It recommends using verbs in titles for function dialogs and object names for property dialogs. The document also provides tips for managing content within dialog boxes, such as using tabbed, expanding, or cascading designs. It concludes with examples from applications like PowerPoint, Photoshop, and Dreamweaver that demonstrate best practices.