In its revised Fourth Edition, this book teaches the basics of S-PLUS Version 7.0 for people with little computing or statistical knowledge. More focused than user manuals, it demonstrates the important concepts of S-PLUS and R, its companion in implementing the S language. The authors offer a guided tour of interactive computing, data exploration, and statistical analysis, explaining how to approach data sets and teaching the corresponding S-PLUS commands. A collection of exercises, fully worked with ready-to-use code, summarizes each chapter. The book includes tips for efficient use of S-PLUS, including how to set up a good working environment and how to integrate S-PLUS with office products.