; (viii) referring at least 30 percent of eligible youth participating in the program from or to providers of youth services, adult employment and training services, vocational rehabilitation services, and adult education and literacy services under the Workforce Innovation and Opportunity Act ( 29 U.S.C. 3101 et seq.) or skills training programs funded by the State or Federal Government; (ix) a rigorous evaluation of the program using research approaches appropriate to the level of development and maturity of the program, including random assignment or quasi-experimental impact evaluations, implementation evaluations, pre-experimental studies, and feasibility studies; and (x) commitment and support from mayors and county executives. (C) Priority In carrying out a summer employment program receiving funding under this section, a local area shall— (i) give priority to summer employment opportunities— (I) in existing or emerging in-demand industry sectors or occupations; or (II) that meet community needs in the public, private, or nonprofit sector; and (ii) for any program year, use not less than 75 percent of the amount allotted under this section to provide summer employment opportunities for eligible youth that are in-school youth. (e) Performance accountability (1) Primary indicators of performance For activities funded under this section, the primary indicators of performance shall include— (A) the performance metrics described in clauses (i)(V) and (ii)(I) of section 116(b)(2)(A) of the Workforce Innovation and Opportunity Act ( 29 U.S.C. 3141(b)(2)(A) )