Bully-Proofing Your School (BPYS) was a school-based intervention program designed to reduce bullying and school violence. The BPYS program differed from other anti-bullying programs by providing teachers with a specific curriculum that could be implemented in the classroom. The purpose of this study was to evaluate the BPYS program at the elementary school and middle school level. The BPYS outcome evaluation consisted of school climate surveys administered to elementary school students (Part 1), middle school students (Part 2), and staff (Part 3) in both treatment and comparison schools. The design of the data collection for the study was a repeated cross-sectional design. The evaluation of BPYS took place over five years. In the spring semesters of 2002, 2003, 2004, 2005, and 2006, all participating schools completed a school climate survey. The researchers collected 4,136 completed elementary school surveys (Part 1), 1,627 completed middle school surveys (Part 2), and 1,209 completed staff surveys (Part 3). For the elementary and middle school students, the mode of data collection was an in-class (group administration) anonymous self-completed survey. For the 1,209 staff surveys (Part 3), the mode of data collection was a mail questionnaire. Part 1 variables include sociodemographic and general school information items, school climate variables, school safety variables, and home and family environment variables. Also included is a filter variable which can be used to select the 3,497 cases that were used in the original analyses. Part 2 variables include sociodemographic and general school information variables, school climate variables, school safety variables, substance use variables, home and family environment variables, variables about guns, variables on activities the respondent participated in, and school attendance variables. Part 3 variables include school and staff characteristics variables, questions about general conditions in the school, questions on how the respondent felt about other people working at the school, questions concerning the resources and participation in the school and the community, and questions regarding staff perceptions of safety at the school.