; and (C) expansion grants to fund implementation and a rigorous replication evaluation of an intervention that has been found to produce statistically significant, sizable, and important impacts under a mid-phase grant described in subparagraph (B) or other effort meeting similar criteria, for the purposes of— (i) determining whether such impacts can be successfully reproduced and sustained over time; and (ii) identifying the conditions under which the intervention is most effective. (3) Criteria In awarding grants under this subsection, the Assistant Secretary shall employ broad eligibility criteria regarding the content or approach of the proposed interventions, and use the promise of the prior research or evidence as the main factor in selecting interventions for award. ; (4) by inserting after paragraph (4), as so redesignated, the following: (5) Evaluation Each recipient of a mid-phase grant described in paragraph (2)(B) or an expansion grant described in paragraph (2)(C) shall conduct a rigorous, third-party evaluation that employs experimental designs using random assignment, when feasible, and other research methodologies that allow for the strongest possible causal inferences when random assignment is not feasible, to determine the effectiveness of the intervention carried out under such grant. (6) Matching funds In order to receive a grant under this subsection, an eligible entity shall demonstrate that the eligible entity will provide matching funds, in cash or through in-kind contributions, from Federal, State, local, or private sources in an amount equal to 10 percent of the funds provided under such grant, except that the Assistant Secretary may waive the matching funds requirement, on a case-by-case basis, upon a showing of exceptional circumstances, such as— (A) difficulty of raising matching funds for a program to serve a rural area; or (B) difficulty of raising funds on tribal land.