Which rulemaking type typically includes additional procedures as required by the agency's enabling act?

Hybrid rulemaking is characterized by the combination of features from both formal and informal rulemaking processes. This type of rulemaking typically requires additional procedures that are specified in the agency's enabling act. Enabling acts are legislative measures that grant agencies the authority to create specific rules, and they often outline the necessary procedural requirements that agencies must follow when developing new regulations.

In hybrid rulemaking, an agency might conduct hearings and solicit public comments while also adhering to formal procedures like providing a detailed statement of the basis and purpose for the rule. This blending of procedures allows agencies to tailor their approach to rulemaking to fit the complexities of specific statutes or regulatory needs, ensuring that all stakeholder concerns are adequately addressed.

The other types of rulemaking do not generally involve the same level of procedural flexibility or requirement dictated by an enabling act to the same extent. Formal rulemaking is typically characterized by a structured process with formal evidentiary hearings, while informal rulemaking generally follows relaxed procedures without mandatory public hearings. Streamlined rulemaking may simplify processes but does not inherently involve the additional procedural requirements seen in hybrid rulemaking.