; (B) the development of longitudinal and clinical trial evaluation and performance measurements with regard to the evidence-based and promising practices funded under this title; and (C) the dissemination of the practices identified in paragraph (2) to the National Research Center for Proven Juvenile Justice Practices (established under section 301), units of local government, and Indian tribes to promote the use of such practices by such units and tribes to prevent involvement in, or to divert further involvement in, juvenile delinquency or criminal street gang activity. (b) Results to the national research center for proven juvenile justice practices The Administrator shall provide the results of the evaluation under subsection (a) to the National Research Center for Proven Juvenile Justice Practices established under section 301. 230. Reservation of funds For fiscal years 2016 through 2020, not more than 20 percent of the total amount appropriated to the Office of Juvenile Justice and Delinquency Prevention to carry out Youth Mentoring Programs for each fiscal year shall be made available to carry out this Act. 3 PROMISE research centers 231. Establishment of the National Research Center for Proven Juvenile Justice Practices (a) Center established Subject to the availability of appropriations, the Administrator shall award a grant to a nonprofit organization with a national reputation for expertise in operating or evaluating effective, evidence-based practices related to juvenile delinquency and criminal street gang activity prevention or intervention to develop a National Research Center for Proven Juvenile Justice Practices. Such Center shall— (1) collaborate with institutions of higher education as regional partners to create a best practices juvenile justice information-sharing network to support the programs and activities carried out with grants under title II of this Act