Introduction to Logic is clear and concise, uses interesting examples, and has innovative, easy-to-use proof methods. It covers a wide range of topics, including syllogisms; definitions and fallacies; inductive reasoning; propositional and quantificational logic; modal, deontic, and belief logic; and metalogic, history of logic, deviant logic, and philosophy of logic. Different parts can be used in a range of logic courses. Updates to the Third Edition include fuller coverage of traditional Copi proofs, better explanations of truth trees, improved explanations throughout, and updated and improved LogiCola software (still free from http: //www.harryhiker.com/lc).?