This book is a collection of key reprints of papers on the computer simulation of statistical-mechanical systems, introduced and commented upon by the editors. The papers presented here provide the reader with a complete and comprehensive source book. It enables the new and experienced practitioner of computer simulation to learn and use the various methods and interpret the restrictions and various possibilities. A balanced view of the history and methodology of the subject and the presence of notes and comments greatly enhance the value of the book as a reference source.