Notice-and-comment rulemaking is the standard, informal process Congress built into the APA for most federal regulations, balancing efficiency against public participation. It requires the agency to publish a notice of proposed rulemaking describing the proposed rule and its legal basis, provide a meaningful opportunity for interested parties to submit comments, and consider those comments before adopting a final rule.

Procedural challenges to a final rule commonly focus on whether the notice adequately described the eventual rule, since a final rule that differs too much from the proposal — failing the "logical outgrowth" test — can be struck down for inadequate notice even if the underlying substance was defensible. Challengers also scrutinize whether the agency genuinely considered significant comments and adequately explained its response, since an agency that received substantial critical comment but did not meaningfully engage with it risks an arbitrary-and-capricious challenge layered on top of the procedural one.

A Juricratic simulation of a rule challenge can model the notice-and-comment process as two independently gated dials — adequacy of notice (logical outgrowth) and adequacy of the agency's response to significant comments — letting a user see that a rule can survive one procedural attack while remaining vulnerable on the other.

Parties who want to influence or later challenge a federal regulation actively participate in the comment period, submitting substantive, well-documented objections, since a comment raised during the process both preserves the issue for later challenge and creates the record against which the agency's final response will be judged.