Bob Nease, chief scientist at Express Scripts, wants to promote home delivery of prescription drugs by mail — a process proven to lower error rates, increase cost savings, and improve medication adherence. But, if switching to home delivery is beneficial to most employees, why don’t more of them do it? Harvard Business School professor John Beshears describes his case entitled “Express Scripts: Promoting Prescription Drug Home Delivery” — how using choice architecture, or nudging people, can guide employees to making wiser decisions while still respecting their autonomy.