The 14th Edition of Introduction to Logic, written by Copi, Cohen & McMahon, is dedicated to the many thousands of students and their teachers - at hundreds of universities in the United States and around the world - who have used its fundamental methods and techniques of correct reasoning in their everyday lives. To those who have not previously used or reviewed Introduction to Logic we extend the very warmest welcome. Please join us and our international family of users! Let us help you teach students the methods and principles needed in order to distinguish correct from incorrect reasoning. For, Introduction to Logic is a proven textbook that has been honed through the collaborative efforts of many scholars over the last five decades.