This document summarizes a presentation on understanding and calculating lost profits damages. It begins with an introduction of the speaker and his qualifications in business appraisal and calculating lost profits damages. It then outlines the presentation topics which include the basics of the legal framework for lost profits, definitions of profits and lost profits, and methods for calculating lost profits such as before and after, sales projection, accounting for profits, yardstick, and economic modeling. The presentation discusses challenges with various calculation methods and concepts like mitigation, causation, foreseeability, reasonable certainty, and discounting future damages to present value. It provides examples of ex ante and ex post calculations of damages and discusses the "book of wisdom" concept of incorporating knowledge gained after the breach