This BCAR report is provided for use by interested BCA users to review and understand the methodology behind the FEMA Damage Frequency Assessment (DFA) Module - previously known as the FEMA Limited Data Module for Benefit-Cost Analysis (LD Module) - and determining unknown frequencies within the LD Module. The methodology report was reviewed by the FEMA BCAR Technical Advisory Group (TAG), and is part of a larger effort to re-engineer the FEMA Benefit-Cost Analysis (BCA) methods, modules, guidance, and training in order to improve the BCA process.