Dhamdheres Operating Systems: A Concept-Based Approach begins with fundamentals and is an ideal text for the undergraduate students. It presents the operating system as anintermediary between a computer system and a user, one that provides services to the user and also ensures high system performance. A discussion of the operating systems interactions with the computer, on one hand, and with user computations, on the other hand, consolidates this view and adds practical details to it. This approach demystifies the idea of the operating system and also emphasizes key features of computer architecture that are essential for a study of operating systems. Feature: Concept-based figures illustrate fundamental concepts and techniques. Advanced topics include kernel memory allocation, deadlockk characterization, synchronization and scheduling in multiprocessor systems, file sharing sermantics, and file system reliability. Numbered examples demonstrate key issues concerning concepts and techniques.