; and (bb) whether the major rule overlaps, duplicates, or conflicts with other rules or, to the extent feasible, State and local government regulations; (III) the major rule needs to be improved in order to accomplish the regulatory objective; and (IV) other alternatives to the major rule or a modification of the major rule could better achieve the regulatory objective while imposing a smaller burden on society or increase net benefits, taking into consideration any cost already incurred. (B) Different methodology If an agency uses a methodology other than the methodology set forth in paragraph (1)(B)(ii) to assess data under subparagraph (A), the agency shall include as part of the notice required under subparagraph (D) an explanation of the changes in circumstances that militated the use of that other methodology. (C) Subsequent assessments If, after an assessment of a major rule under subparagraph (A), an agency determines that the major rule will remain in effect with or without modification, the agency shall— (i) in consultation with the Administrator, include with the assessment produced under subparagraph (A) a list of circumstances or events that would necessitate a subsequent review in accordance with subparagraph (A) to ensure that the major rule continues to meet the regulatory objective; and (ii) develop a mechanism for the public to petition for a subsequent review of the major rule, which the head of the agency shall grant or deny. (D) Publication Not later than 180 days after the date on which an agency completes an assessment of a major rule under subparagraph (A), the agency shall publish a notice of availability of the results of the assessment in the Federal Register, including the specific circumstances or events that would necessitate a subsequent assessment of the major rule under subparagraph (C)(i). (3) Agency head responsibilities The head of each agency shall— (A) oversee the timely compliance of the agency with this subsection