This is an elegant treatment of nonlinear systems concentrating on stability and controls. It includes all of the material in the textbooks only without the verbage. The treatment is deep and outstanding and parallels that of Khalil's and Isidori's books. The only caveat is that the book does assume a pretty good mathematical background from the reader and some experience reading very advanced mathematical tomes - some of the notation is never defined but those having the presumed background will not find this a problem. For the advanced student/practitioner.