Student tardiness has not received as much attention as absences in research on school attendance, despite the disruptions to learning it can cause. The purpose of this study was to design, implement, and study an alternative intervention--the Student Training for a Restorative Outlook for Needed Growth (S.T.R.O.N.G.) Program--to the existing punitive tardy detention practice at a high school where tardiness was a problem. The program promoted on-time behavior to school and class by utilizing positive restorative practice elements along with self-paced learning modules focused on growth mindset, goal setting, punctuality, and organizational skills. The driving force behind the creation of the S.T.R.O.N.G. Program was to determine if this intervention could support a change in students' intent to be on time for class. Students in the S.T.R.O.N.G. Program intervention participated in three steps, beginning with individual restorative conversations and a group restorative conversation. In the second step, students engaged in learning module lessons related to growth mindset, goal setting, punctuality, and organizational skills. After each learning module, students reflected on their learning in individual journals. In the final step, students exited the intervention with a student feedback form. This mixed-methods action research study involved collecting data from interviews, surveys, and reflective journals. Thirteen students participated in the intervention and took an initial student intake questionnaire asking them about their student experiences in the existing punitive tardy detention practice. Qualitative data were coded, analyzed, and used with quantitative data to triangulate findings. The results of the study indicated that students were not in favor of the existing punitive tardy detention practice and preferred an alternative, positive tardy practice that supported self-improvement to help with their on-time behavior. Results also showed the S.T.R.O.N.G. Program to be useful and effective at teaching students information related to the constructs in the learning modules, resulting in students declaring a positive attitude. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]