; and (II) physical and online security measures to identify and prevent safety and security risks. (2) Clearinghouse contents (A) Evidence-based tiers (i) In general The Secretary, in consultation with the Attorney General, the Executive Director of the White House Office of Faith-Based and Neighborhood Partnerships, and the head of any other agency the Secretary determines appropriate, shall develop tiers for determining evidence-based best practices and recommendations that demonstrate a significant effect on improving safety and security of nonprofit organizations, including faith-based organizations, and houses of worship. (ii) Requirements The tiers required to be developed under clause (i) shall— (I) prioritize— (aa) strong evidence from not fewer than one well-designed and well-implemented experimental study; and (bb) moderate evidence from not fewer than one well-designed and well-implemented quasi-experimental study; and (II) consider promising evidence that demonstrates a rationale based on high-quality research findings or positive evaluations that an activity, strategy, or intervention implemented by the Department or a state or local agency is likely to improve and promote safety and security of nonprofit organizations, including faith-based organizations, and houses of worship. (B) Criteria for best practices and recommendations The best practices and recommendations referred to in paragraph (1)(B)(i) of the Clearinghouse shall, at a minimum— (i) identify areas of concern for nonprofit organizations, including faith-based organizations, and houses of worship, including event planning recommendations, checklists, facility hardening, tabletop exercise resources, and other resilience measures; (ii) involve comprehensive safety and security measures, including threat prevention, preparedness, protection, mitigation, incident response, and recovery to improve the safety and security posture of nonprofit organizations, including faith-based organizations, and houses of worship upon implementation