This report provides preliminary information on what needs to be learned about the systematic impact of voucher programs and the characteristics of students and families who make use of the Horizon voucher program in the Edgewood Independent School District in San Antonio, Texas. This initial report answers questions about the systemic impact of vouchers that prior research has been unable to address. Specifically, it provides answers and information to the following questions: (1) What kinds of families take advantage of vouchers when offered to all low-income families? (2) Do low-income parents find a school they prefer? (3) How do the school experiences of voucher families and students compare with those of public-school families? and (4) Do students from low-income families change schools more frequently than public-school students do? Horizon families have somewhat higher educational expectations for their child, yet it is unclear whether these expectations existed prior to the initiation of the program or whether they were an outcome of intervention. More Horizon than Edgewood public-school parents say their child is attending a school the family prefers. Horizon parents report much lower levels of fighting and misbehavior than do Edgewood public-school parents. Horizon students are less likely to move from school to school during the school year. Contains 30 data tables. (DFR)