The 'podular/direct supervision' concept stations a staff member in the center of a 48-bed housing unit to directly supervise inmates. This concept contrasts with the 'linear/intermittent surveillance' approach, which consists of rows of cells at right angles to surveillance corridors; and the 'podular, remote surveillance' concept, which provides for surveillance from a remote station primarily through electronic systems. The 'podular/direct supervision' concept evolved in the early 1970's through a presidential mandate to the Federal prison system to build three prototype detention facilities. These facilities -- built in New York, Chicago, and San Diego -- incorporated state-of-the-art correctional concepts and technologies. Central concepts were functional unit management and the direct supervision of inmates. Principles and dynamics essential for 'podular/direct supervision' relate to safety, control, communications, supervision, manageability, classification, just treatment, and effective personnel. These principles all relate to facility design and staff training that facilitates staff leadership in interacting with and influencing the behavior of inmates. Professional organizations representing corrections and jail practitioners have supported the 'podular/direct supervision' concept, as have courts in some jurisdictions. The application of this concept is quickly spreading across the United States and Canada. 10 references and 3-item bibliography.