In the United Kingdom, delegated legislation (also referred to as secondary legislation or subordinate legislation or subsidiary legislation) is law made by an executive authority under powers delegated from a legislature by enactment of primary legislation; the primary legislation grants the executive agency power to implement and administer the requirements of that primary legislation. It is law made by a person or body other than the legislature but with the legislature's authority. The power to create delegated legislation is limited to making regulation that is incidental to administering the primary legislation. Otherwise it will be considered as invalid or ultra vires. Often, a legislature passes statutes that set out broad outlines and principles, and delegates authority to an executive branch official to issue delegated legislation that flesh out the details (substantive regulations) and provide procedures for implementing the substantive provisions of the statute and substantive regulations (procedural regulations). Delegated legislation can also be changed faster than primary legislation so legislatures can delegate issues that may need to be fine-tuned through experience. This terminology is not used in the United States. In the U.S., the corresponding terminology is as follows: the statute that delegates authority (referred to above as "primary legislation") is called an "authorizing statute" or "delegation of rule making authority" the resultant law promulgated by the executive branch agency (referred to above as "secondary legislation") is called a "regulation"—in the United States, "legislation" is used exclusively to refer to acts of a legislative branch, never the executive or judicial branch the body of law that governs the agency's exercise of rule making and adjudication powers is called "administrative law," primarily the Administrative Procedure Act.