This document is a guide detailing the new features introduced in Fathom 14. It outlines the Scenario Comparison Layer, which allows users to visually compare multiple scenarios through graphical overlays within the Workspace. The Library Manager has been revised for improved customization of libraries. The guide describes enhancements such as Multi-Scenario Graphing for analyzing alternatives, a new Analysis Setup menu for streamlined workflows, and the addition of the Herschel-Bulkley viscosity model. It also presents the Parametric Study tool for evaluating design parameters, along with new graph annotations that update dynamically. Other notable features include improved control over PCF file imports, a Control Valve Sizing Tool, and the ability to save libraries in custom locations. The document emphasizes various user interface improvements and modeling additions aimed at enhancing user experience and efficiency in system design.