; (ii) use of systematic, empirical methods that draw on observation or experiment; (iii) use of data analyses that are adequate to support the general findings; (iv) making claims of causal relationships only in random assignment experiments or other designs (to the extent such designs substantially eliminate plausible competing explanations for the obtained results); (v) consistency of findings across multiple studies or sites to support the generality of results and conclusions; (vi) presentation of studies and methods in sufficient detail and clarity to allow for replication or, at a minimum, to offer the opportunity to build systematically on the findings of the research; and (vii) acceptance by a peer-reviewed journal or critique by a panel of independent experts through a comparably rigorous, objective, and scientific review. ; (20) by inserting after paragraph (26), as redesignated by paragraph (3), the following: (27) Priorities The term priorities means the priorities proposed by the Director and approved by the Board under section 115. (28) Regional educational laboratory The term regional educational laboratory means a regional educational laboratory established under section 157. ; (21) in paragraph (29), as redesignated by paragraph (3), by striking subparagraph (B) and inserting the following: (B) provides an adequate description of the programs evaluated, the study sample, and the individual or multiple sites in which a program was evaluated, and, to the extent possible, examines the relationship between program implementation and program impacts, including whether or not such impact occurred and why, and the contextual factors that may influence program impact; ; (22) in paragraph (30), as redesignated by paragraph (3), by striking scientifically based research standards and inserting principles of scientifically valid research ; (23) by striking paragraph (31), as redesignated by paragraph (3), and inserting the following: (31) State