; (E) performance-based standards; (F) evaluating economic considerations; and (G) developing voluntary building energy codes by Indian tribes in accordance with tribal law. (3) Amendment proposals The Secretary may submit timely voluntary building energy code amendment proposals to the voluntary building energy code-setting and standard development organizations, with supporting evidence, sufficient to enable the voluntary building energy codes to meet the consensus-based targets established under subsection (b)(2). (4) Analysis methodology The Secretary shall make publicly available the entire calculation methodology (including input assumptions and data) used by the Secretary to estimate the energy savings of code or standard proposals and revisions. (d) Determination (1) Revision of voluntary building energy codes If the provisions of the IECC or ASHRAE Standard 90.1 regarding building energy use are revised, the Secretary shall make a preliminary determination not later than 90 days after the date of the revision, and a final determination not later than 15 months after the date of the revision, on whether or not the revision will— (A) improve energy efficiency in buildings compared to the existing voluntary building energy code; and (B) meet the applicable consensus-based targets under subsection (b)(2). (2) Codes or standards not meeting consensus-based targets (A) In general If the Secretary makes a determination under paragraph (1)(B) that a code or standard does not meet the consensus-based targets established under subsection (b)(2), the Secretary may at the same time provide the voluntary building energy code or standard developer with proposed changes that would result in a voluntary building energy code that meets the consensus-based targets and with supporting evidence, taking into consideration— (i) whether the modified code is technologically feasible and economically justified; (ii) available appliances, technologies, materials, and construction practices