To implement the N U D G E program, a knowledge representat ion language — FRL-0 — based on a few powerful generalizations of the t r a d i t i o n a l p r o p e r t y l i s t representa t ion has been developed. T h e N U D G E knowledge base defined in FRL-0 consists of a h ierarchica l set o f concepts t ha t p rov ide generic deser ip t ions of the t y p i c a l ac t iv i t ies , agents, pl...

Serendipity is an engaging, deeply personal and even magical experience to some. While serendipity has been noted to arise during people’s interactions with digital photos, we have yet to understand how this occurs or how it could be supported during-and-through the use of technology. Inspired by findings about serendipity arising from people’s shuffle listening, we designed a digital photo dis...

A lecture hall full of people played a computer game together. Their goal was to keep a tightrope walker balanced. Each had a handset that could deliver a left or right nudge. The tightrope walker was also pelted by tomatoes which knocked him off balance. Across several games, the difficulty of the task was changed by the frequency of tomatoes and whether or not they were visible. After each ga...

Consumers’ systematic decision biases make them vulnerable to market exploitation. The doctrine of "libertarian paternalism" maintains that this problem can be mitigated by "soft" interventions (nudges) like disclosure or "default architecture". However, the case for nudging is often made without an explicit model of the boundedly rational choice procedures that lie behind consumer biases. I de...