Vaiva Kalnikaitė

User Experience Specialist and Researcher


There are available a number of mobile shopping aids and recommender systems, but none of which can be easily used for a weekly shop at a local supermarket. We designed and built a minimalistic, mobile and fully functional lambent display that clips onto any shopping trolley, intended to nudge people when choosing what to buy. It provides salient information about the food-miles for various food items represented by varying lengths of LEDs on the handle and a changing emoticon showing their total miles against a social norm. When evaluated in situ, the lambent handle display nudged people to change their behaviour compared to ordinary shopping strategies; they chose products that travelled less, particularly for those that had greater choice of high mileage. They also felt guilty when the aggregate mileage of the contents of their entire shopping trolley was above the social norm. Presented at the ACM UbiComp conference in Beijing, China - September 2011.


Latest - designing lambent shopping handle

Currently @

Interactables, Studio 151

23 King Street, Cambridge



Human-computer interaction


Ubiquitous computing

Behavioural change




Fast and Frugal Shopping Challenge video to be presented at the ACM conference on human factors in computing systems (CHI 2012) in Austin, Texas USA - May 2012.