Ruby is a high-level, fully object-oriented programming (OOP) language. It is very powerful and relatively easy to learn, read, and maintain. Sams Teach Yourself Ruby in 21 Days provides the best introduction to this language and addresses one of the key constraints it faces: "The paucity of quality English-language documentation is one of the few things holding Ruby back from widespread adoption," according to Dr. Curtis Clifton of Iowa State University¿s Department of Graduate Computer Science.About the Author: Mark Slagell, MS, CS has taught programming languages at the university level where he designed and wrote his own course materials. He edits and maintains one of the first English language Ruby tutorials on the Web and has used Ruby to meet the programming requirements of numerous projects in a mixed Unix/Windows environment.