; and (4) may consider any evidence which may be submitted by interested parties or informed parties. (b) Technical assistance (1) Prior to review of the documented petition under subsection (a), the Assistant Secretary shall conduct a preliminary review of the petition in order to provide technical assistance to the petitioner. (2) The review under paragraph (1) shall be a preliminary review for the purpose of providing the petitioner an opportunity to supplement or revise the documented petition prior to the review under paragraph (1). Insofar as possible, technical assistance reviews under this paragraph will be conducted in the order of receipt of documented petitions. However, technical assistance reviews will not have priority over active consideration of documented petitions. (3) After the technical assistance review, the Assistant Secretary shall notify the petitioner by letter of any obvious deficiencies or significant omissions apparent in the documented petition and provide the petitioner with an opportunity to withdraw the documented petition for further work or to submit additional information. (4) If a petitioner’s documented petition claims previous Federal acknowledgment or includes evidence of previous Federal acknowledgment, the technical assistance review shall also include a review to determine whether that evidence is sufficient to meet the requirements of previous Federal acknowledgment. (c) Response to technical assistance review (1) Petitioners may respond in part or in full to the technical assistance review letter or request, in writing, that the Assistant Secretary proceed with the active consideration of the documented petition using the materials already submitted. (2) If the petitioner requests that the materials submitted in response to the technical assistance review letter be again reviewed for adequacy, the Assistant Secretary shall provide the additional review. (3) If the assertion of previous Federal acknowledgment under section 8 cannot be substantiated during the technical