Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Object-Oriented Turing is an extension of the Turing programming language and a replacement for Turing Plus created by Ric Holt of the University of Toronto in 1991. It is imperative, object-oriented, and concurrent. It has modules, classes, single inheritance, processes, exception handling, and optional machine-dependent programming. There is an integrated development environment under the X Window System and a demo version. Versions exist for Sun-4, MIPS, RS-6000 and others.