; and (B) is part of a study being conducted to determine if such a practice is evidence-based. (8) State The term State means each of the several States, the District of Columbia, the Commonwealth of Puerto Rico, the United States Virgin Islands, American Samoa, Guam, the Northern Mariana Islands, and any other territories or possessions of the United States. (9) Theory of change The term theory of change means a program planning strategy approved by the Administrator that outlines the types of interventions and outcomes essential to achieving a set of program goals. (10) Youth The term youth means— (A) an individual who is 18 years of age or younger; or (B) in any State in which the maximum age at which the juvenile justice system of such State has jurisdiction over individuals exceeds 18 years of age, an individual who is such maximum age or younger. A PROMISE Assessment and Planning Grants 310. PROMISE Assessment and Planning grants authorized (a) Grants authorized The Administrator is authorized to award grants to units of local government and Indian tribes to assist PROMISE Coordinating Councils with planning and assessing evidence-based and promising practices relating to juvenile delinquency and criminal street gang activity prevention and intervention, especially for youth who are involved in, or who are at risk of involvement in, juvenile delinquency and criminal street gang activity. Such PROMISE Coordinating Councils shall— (1) conduct an objective needs and strengths assessment in accordance with section 512