Because interpretative rules are not in place through the actions of the legislature but through the actions of the agency, they have more room for interpretation. Procedural rules are also established and are necessary for the agency to survive. Examples would be rules of conduct for informal consultations and formal hearings as well. These rules are not also strictly adhered to like substantial rules. Agency procedural rules encourage participation by the public and also protect the rights of the client.
Hybrid rules are a combination of actions by the legislative and judicial functions.
A witness who is cross-examined while gathering information to make a new rule is a judicial function within the legislative function of the actual rulemaking itself. Agency rulemaking can also take the shape of formal or informal. It requires no trial-type hearing, there is no notice of the proposed rule, comments from interested parties are not heard and there is a statement of basis and purpose of rule. A formal hearing, on the other hand, does have a hearing, a notice of proposed rule, allows evidence and arguments and statements of findings and publishes the final rule. Policy statements are also available and explain the objectives of the actions an agency takes.