and training engagement strategies, to the extent possible, the State shall ensure the outcome measures align with those used under the Workforce Innovation and Opportunity Act ( 29 U.S.C. 3101 et seq.). (C) Caseload All families participating in a demonstration project carried out under this subsection must be families with a work-eligible individual where the family is receiving assistance under the State TANF program when the family's participation in the demonstration project begins and may continue to participate in the demonstration project without regard to whether the family continues to receive such assistance. (D) Control group A State carrying out a demonstration project under this subsection shall establish a valid random assignment control group on behalf of whom the State (or, if applicable, a county or other political subdivision of the State) shall continue to operate the traditional State TANF program in order to compare outcomes for families participating in the demonstration project with outcomes for families in the control group. (E) Tribal projects In addition to the up to 10 States selected to carry out a demonstration project under this subsection, the Secretary shall select at least 1, but not more than 3, Indian tribes with a tribal family assistance plan approved under section 412 with which to work on related implementation and outcomes studies to improve the engagement of and outcomes for tribal families with a work-eligible individual. (3) Duration Each State carrying out a demonstration project under this subsection shall be authorized to enroll new participants in the demonstration group or control group for not more than 4 years from the date on which any work-eligible individuals first begin to participate in the project. The Secretary may allow for additional time to operate the demonstration project after the time to enroll new participants has expired for the purposes of evaluating the impacts of the demonstration projects. (4) Suspension authority With respect to the families