Many authors recommend various praise to reprimand ratios for teachers to use to manage their classrooms (e.g., Flora, 2000; Nafpaktitis, Mayer, & Butterworth, 1985; Wheldall, 2005); however, these recommendations are based on correlational data or secondary findings from studies not directly manipulating the praise to reprimand ratio. The purpose of this study was to use a simple teacher training method to improve the praise to reprimand ratio used in the classroom and measure the resulting effects on the on-task behavior of an entire class of students. All teachers improved praise to reprimand ratios above baseline levels. As teacher praise to reprimand ratios improved, student on-task levels increased for all classrooms. [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://www.proquest.com/en-US/products/dissertations/individuals.shtml.]