This is the Fifth Edition of the textbook that pioneered the teaching of Evidence using problems rather than appellate opinions. The text explores the Rules of Evidence and their rationales in a straightforward fashion without hiding the ball or ignoring complexities. Problems that clarify the Rules appear throughout the chapters; larger problem sets that explore the Rules in detail are found at the ends of chapters. The updated edition discusses important recent cases and introduces social science findings and recent developments in science and technology that bear on the design and operation of the Rules of Evidence, and on their rationale.