Operating Systems: Design and Implementation is a computer science textbook written by Andrew S. Tanenbaum, with help from Albert S. Woodhull. The book describes the principles of operating systems and demonstrates their application in the source code of Tanenbaum's MINIX, a free Unix-like operating system designed for teaching purposes. The publisher is Prentice Hall (1987). The source code for MINIX was included as part of the original 719 pages of text. Later versions of the three editions also included loadable disks with MINIX.