Visual control is a principle that aims to increase efficiency by making things visible. There are three types of visual controls: indicators, signals, and controls. Indicators simply provide information, signals grab attention, and controls restrict behavior through strong visual messages. Benefits of visual control include correcting problems, reducing costs and waste, and ensuring safety. Implementing visual control involves organizing a committee, developing a plan, providing training, and evaluating results. There are two types of implementation: using actual physical items and using analog visual representations like colors and symbols. Real-time pull boards are an example of visual control in action.