Salaris (Astrophysics Research Institute, Liverpool John Moorse University, UK) and Cassisi (Astronomic Observatory of Collurania, Italy) present the theory of stellar evolution and its application to the study of stellar populations in galaxies, discussing techniques widely applied by researchers investigating the formation and evolution of galaxies. The book is for undergraduates and graduate students in astronomy and astrophysics, and will also be of interest to researchers in galactic and extragalactic astronomy and cosmology