James Stewart’s Calculus series is the top-seller in the world because of its problem-solving focus, mathematical precision and accuracy, and outstanding examples and problem sets. Selected and mentored by Stewart, Daniel Clegg and Saleem Watson continue his legacy of providing students with the strongest foundation for a STEM future. Their careful refinements retain Stewart’s clarity of exposition and make the 9th Edition even more usable as a teaching tool for instructors and as a learning tool for students. Stewart was an outstanding teacher and digital innovator, and Web Assign continues to set the standard for the course with new resources like Explore It interactive learning modules. Showing that Calculus is both practical and beautiful, the Stewart approach and Web Assign resources enhance understanding and build confidence for millions of students worldwide.