Written by william stallings, operating systems: internals and design principles is a book that provides an exhaustive and comprehensive coverage of the topic of operating systems. With the help of inventive tools, the author makes it easy for the reader to understand the technical aspects of operating systems, something which can prove to be difficult.the newest edition has been incorporated with web based animation aid in order to help the students learn faster. At various points in the book, the students are directed to change the inputs to the animation and learn by analyzing the results. The learning experience is significantly enhanced with the help of end of chapter case studies of unix, linux and windows vista. These case studies look extensively at how different operating systems implement and execute specific concepts. These studies provide the students with a solid understanding of the fundamentals of the subject and the different design specifications and tradeoffs involved.the text is written in lucid english and makes liberal use of illustrations for the sake of explanation. The book is divided into eight parts- background, processes, memory, scheduling, input output and files, embedded systems, distributed systems and security. Each of the sections covers a wide variety of topics, which allows for systematic and in-depth studying.the sixth edition of operating systems: internals and design principles was published by pearson in 2009 and is available in paperback. Key features: the book was the winner of the 2009 textbook excellence award awarded by the text and academic authors association.