For All Practical Purposes is the most effective and engaging textbook available for showing mathematics at work in areas with a direct impact on our lives (consumer products and advertising, politics, the economy, the Internet). It was the first, and remains the best, textbook for liberal arts students and for instructors who want to bring students the excitement of contemporary mathematical thinking and help their students think logically and critically. The new edition offers a number of changes designed to make the text more accessible than ever to a wider range of students and instructors.