In concept, if a product, such as a fire door, fire extinguisher, or toaster, is used in the intended manner, the component or system will perform as described in the listing and/or "approval". The listing or test is often cited by a regulation, such as a building code or a fire code, and becomes enforcable through adopted codes or regulations. This concept is known as "bounding" in the nuclear industry. Products whose use is not mandated by any building codes or fire codes often lack a consensus test method.