In any preventive maintenance program, whether in a small or large treatment plant, systematic organizing, scheduling, and recording of the work is necessary if the program is to succeed. One such system, which originated in public water utility practice and was adopted for water and sewage works by the U.S. Army and Air Force, has recently been described by Sanders (1). Application of this system in civilian practice by the Minneapolis-St. Paul Sanitary District (2) and at three plants of the Hampton Roads Sanitation District (3) also have been recently discussed. The purpose of this symposium is to describe briefly the simplicity of the preventive maintenance record system for water and sewage works prescribed in U.S. Army manuals (4) (5), and to demonstrate its adaptability to large as well as small sewage works. A further purpose is to describe improvements to the card forms, including edge-punched cards, used to schedule and record each step in a maintenance program.