This paper contains several studies looking at active choice in a medicinal adherence context. The authors test opt-in, opt-out, active choice (forcing a choice with no default) and enhanced active choice, where one alternative is favored by highlighting the losses entailed by the non-preferred option.They tested this method by asking employees from an educational institution (n=110) if they wanted to be reminded about receiving a future flu-shot.The results showed that enhanced active choice was by far the most effective method at inducing compliance.