; (B) delivers rehabilitative services to gang-involved individuals and families; and (C) addresses the barriers that gang-involved youth and their families encounter and the societal factors that promote gang violence. (4) Evidence-based The term evidence-based , when used with respect to a practice relating to gang activity prevention and intervention (including community-based gang intervention), means a practice (including a service, program, or strategy) that has statistically significant outcomes that include a reduction in gang-related violence and an increased number of youth in job development, recreation, arts-based activities, or faith-based activities. Such outcomes may be determined by— (A) an experimental trial, in which participants are randomly assigned to participate in the practice that is the subject of the trial; or (B) a quasi-experimental trial, in which the outcomes for participants are compared with outcomes for a control group that is made up of individuals who are similar to such participants. (5) Gang The term gang means a group of individuals— (A) organized by geography, culture, or activity; (B) that have a group name, and may have other identifying characteristics of the group such as colors and nicknames; and (C) who engage in the use of violence to defend the members or territory of the group. (6) Promising The term promising , when used with respect to a practice relating to community-based gang intervention, means a practice that is not evidence-based, but— (A) that has outcomes from an evaluation that demonstrate that such practice reduces gang-related violence and crime; or (B) about which a study is being conducted to determine if such practice is evidence-based. (7) Youth The term youth means— (A) an individual who is 18 years of age or younger