Public school-choice programs are diverse and offer within- and outside-district flexibility in meeting student needs. This bulletin examined data available from the 1993-94 Schools and Staffing Survey (SASS), conducted by the National Center for Education Statistics (NCES), to answer questions about regional differences in choice programs, availability, and student participation in choice programs. The data show that in 1993-94, the percentage of public school districts with school-choice programs varied widely across the four regions of the country. Among all public school districts in the United States, interdistrict choice was the most widely available choice program option in 1993-94. Among districts with choice programs, smaller percentages of students participated in interdistrict choice than in either intradistrict or magnet-school choice programs. The variation in participation rates may reflect not only variation in parents' and students' willingness to participate in different types of public school choice programs, but also variation in districts' policies and capabilities regarding choice program participation. One figure and two tables are included. (LMI)