Case Study 1 — Campus Dining (R1 University, 28k students)

Key Results Peak throughput unchanged (0.0 sec delta; 37.8s/order both periods). Compost capture: +29.4 pts (to 61.3%). Contamination: −14.8 pts (to 11.2%). Student satisfaction (to‑go durability): 4.4/5 → 4.6/5. Waste Audit Snapshot Stream Baseline kg/day Post kg/day Landfill 520 311 Recycle 181 178 Compost 74 286 ROI (Year 1) Packaging cost +$0.018/meal; organics hauling credit −$0.021/meal → net −$0.003/meal. Payback immediate (no capex needed). Tactics that Worked “Compost‑me” icons printed on lids; QR code to 10‑sec explainer. Green‑team ambassadors in Week 1 cut contamination by 6 pts.