Executive Order 12866 describes a process whereby OMB’s Office of Information and Regulatory Policy (OIRA) reviews some EPA rules. At the same time, OIRA may coordinate review by other federal agencies. OIRA decides which rules will undergo regulatory review and which rules will not. Sometimes, OIRA will choose to review one stage of a rule but not another stage. For example, a rulemaking’s Notice of Proposed Rulemaking might undergo review, but later on, the Final Rule will not undergo review.