U.S. social programs, set up to address important problems, often fall short by funding specific models/strategies ("interventions") that are not effective. When evaluated in scientifically-rigorous studies, social interventions in K-12 education, job training, crime prevention, and other areas are frequently found ineffective or marginally effective. Interventions that produce sizable, sustained effects on important life outcomes tend to be the exception. The Top Tier Evidence Initiative seeks to assist policy officials in identifying interventions meeting the Congressional Top Tier evidence standard, defined in recent legislative provisions as "well-designed randomized controlled trials [showing] sizeable, sustained effects on important outcomes." "Evidence Summary for the Promise Academy Charter Middle School in Harlem Children's Zone" provides a description of the charter middle school in New York City, serving mainly low-income, minority students--The Promise Academy. The method of evaluation includes a well-conducted randomized controlled trial, based on the lottery used to determine which students are offered admission. Key findings show that by the end of eighth grade--three years after random assignment--students' math achievement increased by 0.53 standard deviations (about 1.5 grade levels) and English language arts achievement by 0.20 standard deviations (about 3/4 of a grade level). The Top Tier initiative's expert panel has identified this intervention as Near Top Tier. Intervention benefits and costs are provided.