This law school casebook, developed by a team of professors at Harvard Law School, introduces students with little or no quantitative background to the basic analytical techniques that attorneys need to master to represent their clients effectively. It presents clear explanations of decision analysis, games and information, contracting, accounting, finance, microeconomics, economic analysis of the law, fundamentals of statistics, and multiple regression analysis. References and examples have been thoroughly updated for this edition, and exposition of a number of key topics has been reworked to reflect insights gained from teaching these topics to Harvard Law students over the past decade.