Helping you maximize your study time and course results, the Study Guide includes a variety of learning tools. Each chapter is outlined and summarized, major terms and figures are defined, and self-tests are provided to help you review and retain what you read in the textbook. Learning Objectives, Chapter Outlines, Chapter Summaries, and Key Terms reflect the new content in the Sixth Edition. A full 30 percent of the questions in the Self-Test section have been revised. Each question in the Self-Test section tests students on one of the Learning Objectives in the text, and the Learning Objective with which each question correlates is cited in the Answer Key.