One Point Lesson (OPL) is used in employee training to explain a single task, process, or safety guideline in a simple and visual format. Companies use OPLs to improve workplace learning, reduce errors, and standardize procedures. These short training documents often include diagrams, step-by-step instructions, and key reminders for workers. OPLs are especially effective in manufacturing, quality control, and operational training because they help employees quickly understand important concepts and perform tasks more accurately and efficiently.