The present title Computational Physics has been written with the aim to provide readers the detailed information experimentally accessible computational approaches based on detailed atomic models. This book is organized so that non specialists as well as more advanced users can benefit. It can serve as both as introductory text to computational sciences making it useful for undergraduate and postgraduate students, and also a reference source for active researchers in the field. Efforts have also been made to compile a comprehensive but reasonably concise review of relevant theoretical and computational methods that is self contained. In addition, the book provides the needed information for calculating the interpreting experimentally observed properties on the basis of results generated by centre simultations.