How can we best explore the range of users' reactions when developing future technologies that may be controversial, such as personal healthcare systems? Our approach - ContraVision - uses futuristic videos, or other narrative forms, that convey either negative or positive aspects of the proposed technology for the same scenarios. We conducted a user study to investigate what range of responses the different versions elicited. Our findings show that the use of two systematically comparable representations of the same technology can elicit a wider spectrum of reactions than a single representation can. We discuss why this is so and the value of obtaining breadth in user feedback for potentially controversial technologies

Peer-reviewedMobile privacy concerns are central to Ubicomp and yet\ud remain poorly understood. We advocate a diversified\ud approach, enabling the cross-interpretation of data from\ud complementary methods. However, mobility imposes a\ud number of limitations on the methods that can be\ud effectively employed. We discuss how we addressed this\ud problem in an empirical study of mobile social networking.\ud We report on how, by combining a variation of experience\ud sampling and contextual interviews, we have started\ud focusing on a notion of context in relation to privacy, which\ud is subjectively defined by emerging socio-cultural\ud knowledge, functions, relations and rules. With reference to\ud Gieryn’s sociological work, we call this place, as opposed\ud to a notion of context that is objectively defined by physical\ud and factual elements, which we call space. We propose that\ud the former better describes the context for mobile privacy