; and (ii) assist the petitioner to clarify the petition so that the Chief Counsel is able to understand the issues of concern to the petitioner; and (B) may not advise a petitioner on whether the petition should be amended or withdrawn. (c) Prima facie review (1) In general Upon receipt of a petition filed under this section with respect to the certification of a proposed rule, the Chief Counsel shall make an initial prima facie determination on the merit of the issues raised in petition as to the properness of the certification and whether the proposed rule in question would, if promulgated, have a significant economic impact on a substantial number of small entities. (2) No further review If, following the prima facie review of a petition under paragraph (1), the Chief Counsel determines that the issues raised in the petition do not merit further review by the Chief Counsel, the Chief Counsel shall, not later than 10 days after receipt of the petition, inform the petitioner of that determination and the matter shall be closed. (3) Further review If, following the prima facie review of a petition under paragraph (1), the Chief Counsel determines that the issues raised in the petition do merit further review by the Chief Counsel, the Chief Counsel shall, not later than 10 days after receipt of the petition, inform the petitioner and the agency that promulgated the proposed rule that the Chief Counsel shall conduct a full review of the certification and proposed rule to which the petition relates under subsection (d). (d) Full review (1) Considerations; meeting In conducting a full review under this subsection with respect to the certification made under section 605(b), the Chief Counsel shall— (A) consider— (i) whether the agency that promulgated the proposed rule correctly determined which small entities will be affected by the proposed rule; (ii) whether the agency considered adequate economic data to assess whether the proposed rule will have a significant impact on a substantial number of small entities