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People use photographs for numerous reasons with one of the most common uses of both analog and digital photographs is as an artifact to share and discuss with others. While the practice of photo sharing has been thoroughly examined in the HCI community, there is currently very little research on easily capturing and sharing content within groups of collocated mobile users. In this paper we present the design, implementation, and evaluation of a mobile photo sharing application, Mobiphos, that gives a group of collocated users the ability to capture and simultaneously share photos in real-time with each other.

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With the proliferation of mobile devices it has become common to see groups of users working or playing together using multiple mobile devices. While much effort is exerted to ensure that interaction with a mobile device is useful for each individual user, less effort has gone into considering how to design and evaluate mobile interfaces and platforms for group use. Recent improvements in the interaction, computing, connectivity and general flexibility of mobile devices make them an ideal, yet underutilized, platform for group level interaction. Our goal with this workshop is to bring together researchers who have started to investigate the collocated group use of mobile devices and to shed light on the challenges of designing and evaluating mobile collocated group experiences.

In this paper we present a 20-participant controlled experiment to evaluate and compare a head-down visual display and a synthesized speech audio display for comprehending text while mobile. Participants completed reading comprehension trials while walking a path and sitting. We examine overall performance and perceived workload for four conditions: audio-walking, audiositting, visual-walking, and visual-sitting. Results suggest audio is an acceptable modality for mobile comprehension of text. Participants' comprehension scores for the audio-walking condition were comparable to the scores for the visual-walking condition. More importantly, participants saw improvements in their ability to navigate the environment when using the audio display.