In lean, you may have heard the term AB control. This is often used at Toyota, but is also often confused in the West, especially with the terms one-piece flow and lot size one. AB control is related, but different. In fact, it is closer to a pull production than to lot size one and one-piece flow. But all three help enable a smooth flow of the product toward the customer without overproduction. Let’s first have a look at the other terms: