; or (B) a practice that has not been previously implemented by the State, but is supported by evidence of positive change and has been evaluated before using a pre- and post-assessment comparison between intervention and comparison groups and suggests some statistically significant evidence of positive change (14) Tier-3 practice Subject to subsection (c), the term tier-3 practice means with respect to a State, a practice that— (A) previously has been implemented by a program funded by a State