; and (B) shall publish online a detailed written explanation of any such waiver. (b) Agency consultation with OIRA (1) In general An agency may consult with OIRA at any time on any regulatory action. (2) Regulation identifier number The head of an agency shall make every effort to obtain a regulation identifier number for the regulatory action that is the subject of the consultation before consulting with OIRA. (3) Consultation information required If the head of an agency is unable to obtain the regulation identifier number as described in paragraph (2), the head of the agency shall provide the regulation identifier number to OIRA as soon as the number is obtained with a list of any previous interactions with OIRA relating to the regulatory action that is the subject of the consultation. (c) Agency submission of significant regulatory action for review Before issuing a significant regulatory action, the head of an agency shall submit the significant regulatory action to the Administrator for review and shall include the following: (1) The text of the significant regulatory action. (2) A detailed description of the need for the significant regulatory action. (3) An explanation of how the significant regulatory action will meet the identified need. (4) An assessment of potential costs and benefits of the significant regulatory action. (5) An explanation of the manner in which the significant regulatory action is consistent with a statutory mandate and avoids undue interference with State, local, and tribal government functions. (6) For an economically significant regulatory action, if any of the following was developed during the decisionmaking process of the agency: (A) An assessment of and quantification of costs and benefits of the significant regulatory action. (B) An assessment of and quantification of costs and benefits of potentially effective and feasible alternatives, including any underlying analysis. (C) An explanation of why the planned significant regulatory action is preferable to any identified