This is a comprehensive introduction to the fundamentals of logic (both formal logic and critical reasoning), with exceptionally clear yet conversational explanations and a multitude of engaging examples and exercises. Herrick's examples are on-point and fun, often bringing in real-life situations and popular culture. And more so than other logic textbooks, Introduction to Logic brings in the history of philosophy and logic through interesting boxes/sidebars and discussions, showing logic's relation to philosophy. The book is especially suited for use in the "Open Course Library," a comprehensive online logic course that is open and free. Jointly funded by the state of Washington and the Bill & Melinda Gates Foundation, the Logic Course is one of 80 hybrid courses available online at no charge to the more than 400,000 students in the Washington system. The course is also available for logic courses throughout the US and the world. The Logic Course is available online now. Herrick was chosen to develop the Logic Course for the online Open Course Library. Here is a link for information on the Open Library Course Logic Course: The most affordable logic text available, Introduction to Logic is offered in both paperback and eBook formats and is ideal for any introduction to logic course. Ancillaries: An Instructor's Manual features a brief summary of each chapter of the text, answers to all the questions in the text, additional questions and exercises for instructors to use on quizzes and exams, and a PowerPoint presentation that covers the entire book. The Instructor's Manual is available on CD or online at www.oup.com/us/herrick. Also online at www.oup.com/us/herrick, students will find self-quizzes with a limited number of questions taken from the test bank. As part of the Open Course Library, instructors and students can access the entire online logic course, which features 115 video demonstrations that follow the book chapter-by-chapter, over 20 detailed PowerPoint presentations covering the most technical parts of the course, and over 40 online lectures featuring a self-test with answers for each chapter. Additionally, Herrick's website, www.manyworldsoflogic.com, exists as a general online resource for teachers and students of logic and features extra credit assignments and further study materials. Message: Untangling the complexities of logical theory using clear explanations and many examples drawn right out of everyday life