The Administrative Procedure Act (APA), which applies to all executive branch and independent agencies, prescribes procedures for agency rulemakings and adjudications, as well as standards for judicial review of final agency actions. This report provides a brief overview of the APA's core rulemaking and judicial review provisions. After addressing the various methods through which agencies may promulgate rules, the report highlights the numerous exceptions to the APA's general procedural requirements, including the "good cause" standard, and the rules regarding agency issuance of policy statements, interpretive rules, and rules of agency procedure. The report then briefly describes two executive orders that place additional rulemaking requirements on executive branch agencies. The report concludes with a discussion of judicial review of agency action, with a focus on the arbitrary and capricious test, and the review of rule repeals and other changes in agency policy. The APA describes rulemaking as the "agency process for formulating, amending, or repealing a rule." A "rule," for purposes of the statute, is defined expansively to include any "agency statement of general or particular applicability and future effect designed to implement, interpret, or prescribe law or policy or describing the organization, procedure, or practice requirements of an agency." Rules that are issued in compliance with certain legal requirements, and that fall within the scope of authority delegated to the agency by Congress, have the force and effect of law. Federal agencies may promulgate rules through various methods. Although the notice-and-comment rulemaking procedures of § 553 of the APA represent the most commonly followed process for issuing legislative rules, agencies may choose or may be required to use other rulemaking options, including formal, hybrid, direct final, and negotiated rulemaking. The method by which an agency issues a rule may have significant consequences for both the procedures the agency is required to undertake and the deference with which a reviewing court will accord the rule. In addition, the APA contains whole or partial exceptions to the statute's otherwise applicable procedural rulemaking requirements. Generally, when an agency promulgates legislative rules, or rules made pursuant to congressionally delegated authority, the exercise of that authority is governed by the informal rulemaking procedures outlined in 5 U.S.C. § 553. In an effort to ensure public participation in the informal rulemaking process, agencies are required to provide the public with adequate notice of a proposed rule followed by a meaningful opportunity to comment on the rule's content. Although the APA sets the minimum degree of public participation the agency must permit, the legislative history of the APA suggests that "[matters] of great importance, or those where the public submission of facts will be either useful to the agency or a protection to the public, should naturally be accorded more elaborate public procedures." The requirement under § 553 to provide the public with adequate notice of a proposed rule is generally achieved through the publication of a notice of proposed rulemaking in the Federal Register . The APA requires that the notice of proposed rulemaking include "(1) the time, place, and nature of public rulemaking proceedings; (2) reference to the legal authority under which the rule is proposed; and (3) either the terms or substance of the proposed rule or a description of the subjects and issues involved." Generally speaking, the notice requirement of § 553 is satisfied when the agency "affords interested persons a reasonable and meaningful opportunity to participate in the rulemaking process." Once adequate notice is provided, the agency must provide interested persons with a meaningful opportunity to comment on the proposed rule through the submission of written "data, views, or arguments." The comment period may result in a vast rulemaking record as persons are permitted to submit nearly any piece of information for consideration by the agency. While there is no minimum period of time for which the agency is required to accept comments, in reviewing an agency rulemaking, courts have focused on whether the agency provided an "adequate" opportunity to comment—of which the length of the comment period represents only one factor for consideration. Once the comment period has closed, the APA directs the agency to consider the "relevant matter presented" and incorporate into the adopted rule a "concise general statement" of the "basis and purpose" of the final rule. The general statement of basis and purpose should "enable the public to obtain a general idea of the purpose of, and a statement of the basic justification for, the rules." The agency is not required to include in the final rule a response to every comment received. Instead, the agency is obligated only to respond to what the courts have characterized as "significant" comments. The final rule, along with the general statement must be published in the Federal Register not less than 30 days before the rule's effective date. Although rules are typically promulgated through the informal rulemaking process, in limited circumstances, federal agencies must follow formal rulemaking requirements. Under the APA, "when rules are required by statute to be made on the record after opportunity for an agency hearing" the formal rulemaking requirements of § 556 and § 557 apply. The Supreme Court has interpreted this language very narrowly, determining that formal rulemaking requirements are only triggered when Congress explicitly requires that the rulemaking proceed "on the record." When formal rulemaking is required, the agency must engage in trial-like procedures. The agency, therefore, must provide a party with the opportunity to present his case through oral or documentary evidence and "conduct such cross-examination as may be required for a full and true disclosure of the facts." Formal rulemaking proceedings must be presided over by an agency official or Administrative Law Judge who traditionally has the authority to administer oaths, issue subpoenas, and exclude "irrelevant, immaterial, or unduly repetitious evidence." Formal rulemaking procedures also prohibit ex parte communications between interested persons outside the agency and agency officials involved in the rulemaking process. The agency or proponent of the rule has the burden of proof, and such rules must be issued "on consideration of the whole record … and supported by … substantial evidence." In providing rulemaking authority to an agency, Congress may direct the agency to follow specific procedural requirements in addition to those required by the informal rulemaking procedures of the APA. Hybrid rulemaking statutes typically place additional procedural rulemaking requirements on agencies that may be found in the adjudicative context, but fall short of mandating that an agency engage in the APA's formal rulemaking process. These statutes generally create a rulemaking process with more flexibility than the formal rulemaking procedures under § 556 and § 557 and more public participation than informal rulemaking procedures under § 553. Hybrid rulemaking statutes may require that the agency: hold hearings; allow interested persons to submit oral testimony; and grant participants opportunities for cross examination or questioning. Hybrid rulemaking is only required where expressly directed by Congress, and such statutes were frequently enacted in the 1970s. Federal agencies have developed a process known as direct-final rulemaking in order to quickly and efficiently finalize rules for which the agency does not expect opposition. Under direct-final rulemaking, the agency publishes a proposed rule in the Federal Register . In contrast to informal rulemaking, however, the notice will include language providing that the rule will become effective as a final rule on a specific date unless an adverse comment is received by the agency. If even a single adverse comment is received, the proposed rule is withdrawn, and the agency may issue its proposed rule under the APA's informal notice-and-comment requirements. In this manner, the agency can efficiently finalize unobjectionable rules while avoiding many of the procedural delays of the traditional notice-and-comment rulemaking requirements. Although there is no express statutory authorization for direct-final rulemaking, this type of rulemaking has been justified under the "unnecessary" portion of the APA "good cause" exception, discussed infra , as well as the informal notice-and-comment rulemaking procedures. Negotiated rulemaking represents a supplement to traditional informal rulemaking procedures that allows agencies to consult with interested persons and interest groups at the developmental stages of the rulemaking process. The goal of the negotiated rulemaking process is to increase administrative efficiency and decrease subsequent opposition to a promulgated rule by engaging the participation of outside groups with significant interest in the subject matter of the rule. In principle, negotiated rulemaking allows the agency and other involved interests to reach consensus in the early rulemaking stages so as to produce a final rule that is more likely to be acceptable to all parties. Under the Negotiated Rulemaking Act (the Act), the head of an agency is authorized to "establish a negotiated rulemaking committee to negotiate and develop a proposed rule if … the use of the negotiated rulemaking procedure is in the public interest." The Act lays out a number of mandatory considerations for determining whether a negotiated rule would be in the public interest. Once an agency has made the decision to establish a negotiated rulemaking committee, the agency must follow the Federal Advisory Committee Act with regard to the committee and must publish a notice in the Federal Register detailing the duties of the committee and the committee's proposed membership. The negotiated rulemaking committee generally consists of a maximum of 25 members, with at least one agency representative. The public must have an opportunity to comment on the proposal to create the committee and the proposed membership. If the committee achieves consensus on a proposed rule, the committee issues a report outlining the proposed rule. If the committee does not achieve a consensus, the committee may issue a report with any negotiated positions on which it did reach consensus. The report and the committee's conclusions are not binding on the agency. Indeed, any proposed rule that arises as a result of the deliberations of a negotiated rulemaking committee must subsequently "be finalized through ordinary notice-and-comment procedures.... " Although agencies are authorized, at their discretion, to engage in negotiated rulemaking pursuant to the Act, in limited instances Congress requires an agency to comply with negotiated rulemaking procedures in issuing specific rules. The APA has carved out a number of exceptions to the default notice-and-comment rulemaking requirements.