Background. Interactive multimedia programs derived from the Sunny Days, Healthy Ways (SDHW) sun safety curriculum were evaluated with children aged 5-13. Methods. A randomized pretest to posttest 3-group study was conducted with 871 students in 12 primary schools in the western United States comparing computer programs alone, teacher-led presentation, or both combined. Results. Computer programs with teacher-led presentation improved knowledge over either treatment individually (P =.001). The combination improved self-reported sun protection in lower but not higher grades over teacher-led presentation (P =.005). Conclusions. Computer-based sun safety instruction used with teacher instruction in primary schools may improve sun safety, especially with younger children. Copyright © AACE and EACE.