The article presents an overview of a series of papers presented at the third Association for Computing Machinery (ACM) Symposium on Operating Systems Principles. They include "TENEX: A Paged Time Sharing System for the PDP-10," by D. G. Bobrow and colleagues, "Synchronization of Communicating Processes," by A. Nico Habermann, "Properties of the Working Set Model," by Peter J. Denning and Stuart C. Schwartz, and "An Operating System Based on the Concept of a Supervisory Computer," by R. S. Gaines.