Rulemaking is the process by which federal or state agencies translate vague congressional statues into rules of law. The federal process is guided by the Administrative Procedures Act (APA) of 1946, and states have enacted similar legislation to guide state agency processes. The APA requires any agency that produces a rule to notify the public, allow time for public comment, and respond to those comments. The rulemaking process can be broken down into three stages including the pre-proposal, notice and comment, and rule finalization stages. Stage 1, the pre-proposal stage, consists of the agency activities to produce a draft rule. Stage 2, the notice and comment stage, includes the process outlined by the APA when the agency formally publishes a Notice of Proposed Rulemaking (NPRM) in the Federal Register. Stage 3 of the rulemaking process begins once the comment period ends. At this juncture, agency personnel review the comments to determine the language and substance of the final rule and publish it in the Federal Register. Once a rule is finalized, it carries the same weight as a congressional law. Since the early 1990s, scholars have become more interested in analyzing the rulemaking process. First, some scholars have focused on describing how the rulemaking process unfolds across the bureaucracy, and they provide a roadmap toward implementing 21st-Century Rulemaking strategies to make the process more efficient. In this regard, scholars have illustrated the need for more collaborative rulemaking processes; which methods work best continues to be a debate in the field. The second area of research focuses on Rulemaking and the Role of Institutions in influencing outcomes. These scholars are interested in explaining the role of the president, congress, and the courts in the rulemaking process with the goal of determining which institution(s) is most influential in shaping regulatory outcomes. The third track of research addresses Stakeholders and Rulemaking and attempts to determine which groups are more influential and at which stage. Finally, a small, but growing, pool of scholarship addresses the above questions within the context of State Rulemaking. This article provides an overview of prevalent research in each of these areas.