; and (B) may focus on an area of education in early childhood through postsecondary study. (2) Definitions In this subsection: (A) Eligible entity The term eligible entity means a public agency or private entity that— (i) has demonstrated the ability and capacity to conduct scientifically valid research; and (ii) proposes to partner with one or more of the following entities: (I) An early childhood education program, Head Start agency, or lead agency designated under section 658D of the Child Care and Development Block Grant Act of 1990 ( 42 U.S.C. 9858b ). (II) A public elementary school or secondary school (including a charter school), Bureau-funded school, local educational agency, or State educational agency. (III) An institution of higher education, including a community college, a historically Black college or university, a Tribal College or University, or another minority-serving institution. (IV) An adult education provider or a lead State office with primary responsibility for adult education. (B) Research-practice partnership The term research-practice partnership means mutually beneficial and ongoing collaboration between researchers, practitioners, and education system leaders— (i) to identify and develop research questions, designs, measurements, and methods that address educational challenges in early childhood through postsecondary study, as applicable; (ii) to conduct and support field-initiated research, including evaluations