This document outlines lockout/tagout procedures for controlling hazardous energy sources. It discusses: 1) The scope of lockout/tagout, which applies to most industries except for certain exceptions. 2) The purpose of lockout/tagout, which is to establish a program and procedures to isolate machines and equipment from energy sources before workers perform service or maintenance. 3) Key definitions including authorized employees who apply lockout/tagout, affected employees who operate machines under lockout/tagout, and other employees who are prohibited from re-energizing machines under lockout/tagout.