Closer and Closer is the ideal first introduction to real analysis for upper-level undergraduate Math majors. The text is divided into two main parts; the core material of the subject is covered in Chapters 1-12, and a series of cases, examples, applications, and projects, collectively called Excursions form the second half of the book. These Excursions are designed to bring the concepts of real analysis to light and to allow students to work through numerous interesting problems with ease.