This annual publication is designed to be a one-stop shop for all the existing research on private school choice in the United States. This year's edition is updated with the research published since the last edition. Since the first modern-day voucher program launched in Milwaukee in 1990, researchers have studied private school choice programs. Few American education reforms have been studied as much as choice. Even fewer, if any, have such a broad array of possible outcomes for students, schools, taxpayers and families. Researchers from across the country have published almost 170 empirical studies on the effectiveness of these programs. In this resource, the findings of the empirical studies are broken down by U.S. voucher, tax-credit scholarship and education savings account programs to date. The outcomes include: (1) Program Participant Test Scores; (2) Program Participant Attainment; (3) Parent Satisfaction; (4) Public School Students' Test Scores; (5) Civic Values and Practices; (6) Racial/Ethnic Integration; and (7) Fiscal Effects. [For the full report, go to: https://www.edchoice.org/research-library/?report=the-123s-of-school-choice-2/. For "The 123s of School Choice: What the Research Says about Private School Choice Programs in America. 2020 Edition," see ED605664.]