For introductory courses on operating systems. _Operating Systems: Internals and Design Principles_ provides a comprehensive and unified introduction to operating systems topics. Stallings emphasizes both design issues and fundamental principles in contemporary systems and gives readers a solid understanding of the key structures and mechanisms of operating systems. He discusses design trade-offs and the practical decisions affecting design, performance and security. The book illustrates and reinforces design concepts and ties them to real-world design choices through the use of case studies in UNIX and Windows. _Operating Systems: Internals and Design Principles_, 6e received the 2009 Textbook Excellence Award from the Text and Academic Authors Association (TAA)!