This book describes Knuth's WEB system, a language designed to produce the best possible documentation for computer programs. Specifically, it describes a version of WEB adapted to the C Programming language by Silvio Levy, combining Knuth's other creation TEX language. This title: explains what CWEB is and shows how to use it; facilitates a style of programming that will maximize the ability to perceive the structure of complex software; and mechanically translates documented programs into a working system that matches the documentation.