In this webinar recording, Adam Brumberg, Deputy Director of the Cornell Food and Brand Lab, and Erin Sharp, MS, MAT, Curriculum Designer for the Smarter Lunchrooms National Office, explain how to incorporate tray waste evaluation as a quantitative tool for measuring consumption of target foods and proving impact in the lunchroom. The Cornell BEN Center pioneered the quarter-waste system, which is an easy, clean, quick, and accurate method for measuring tray waste; this method, as well as photography and other secondary measures, are profiled. Viewers will get to practice using the quarter-waste method with case study photographs. Lastly, the instructors suggest ways to incorporate other school stakeholders in helping measure, analyze, and share the results of a tray waste study, including partnering with teachers and students for real-time action research. This webinar may be of most interest to those in the academic field or who need quantitative proof of impact for reporting purposes.