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Groups collaborating around a large wall display can do so in a variety of arrangements, positioning themselves at different distances from the display and from each other. We examined the impact of proximity on the effectiveness and enjoyment of colocated collaboration. Our results revealed collaborative benefits when participants were positioned close together, and interaction with the display was felt to be more effective when participants were close to the display. However, clear tradeoffs were evident for these configurations. When at a distance to the display, the choice of direct versus indirect interaction revealed that interactions were easier when using direct input but the effectiveness of the collaboration was compromised.

As large displays become prevalent in public spaces, they could be employed to create novel game experiences for the public. We present an exploratory study of an ad-hoc multiplayer game played on such public displays. The game, Flashlight Jigsaw, was deployed in a shared lab space and a public atrium for two weeks in total. Through interviews supported by observations and system logs we explored the experiences and behaviors of players and spectators. We also investigated the interrelationship between public display games and the spaces they are deployed in. The research resulted in findings regarding game play, communication, social interaction, spectatorship, and space and location around such a game. We use our findings to develop design implications for future public display games. Author Keywords Public display, games, flashlight display, exploratory study.

In this paper we present a system that provides personalized privacy support for large public displays based on the current social situation and individual privacy profiles. We first present the results of a user study that was conducted to derive the requirements for the design of the system. In the second part of the paper, we describe the developed system consisting of a program for privacyenhancing information management and a small personal artefact for an easy adaptation of the privacy settings to the local context.

Two public display systems, with different methods of posting, were deployed over several years. One, the Thank You Board, was designed to give people an outlet specifically for publicly thanking and acknowledging others in the community. The other, SI Display, showed any Twitter post directed to the display and did not have explicit usage guidelines. People preferred the flexibility of the latter, but ambiguity about its purpose and norms of usage persisted even six months after deployment and made some people hesitant to post. Also, using Twitter as the posting mechanism facilitated participation for some but also created barriers for those not using Twitter and for Twitter users who were wary of mixing their professional and nonprofessional contexts.

Intelligent environments enable users to receive information from a variety of sources, i.e. from a range of displays embedded in those environments. From a services perspective delivering presentations to users in such an environment is not a trivial task. While designing a service it is, for example, not clear at all which displays will be present in the specific presentation situation and which of those displays might be locked by other services. It is further unclear if other users are able to see the presentation, which could cause problems for the presentation of private information in a public space. In this paper we propose a solution to this problem by introducing the concept of a presentation service that provides an abstraction of the available displays. The service is able to detect conflicts that arise when several users and services try to access the same display space and provide strategies to solve these conflicts by distributing presentations in space and time. The service also notifies the user by a alarm signal on a personal device each time a presentation is shown on a public display in order to disambiguate content between multiple users.

Abstract—This paper presents a set of guidelines for the design of multi-user awareness systems. In a first step, general requirements for team awareness systems are analyzed. In the second part of the paper, the identified requirements are aggregated and transformed into concrete design guidelines for the development of team awareness systems.

People collaborating in groups have potential to produce higher-quality output than individuals working alone, due to the pooling of resources, information, and skills. Yet social psychologists have determined that groups rarely harness this potential. This thesis proposes that technology in face-to-face settings can be used to address the social factors that have damaging influence on group decision-making processes. While there is much work in the area of collaborative software and groupware, this work differentiates itself with its specific aim to influence the way a group shares information without mediating the group’s communication. By presenting visualizations to the group of individual levels of participation and turn-taking behavior, the technology aims to augment the group’s communication ability, by making it more aware of imbalances. A series of dynamic displays positioned peripherally to a discussion were developed and used by a variety of groups during face-to-face meetings. Both observational and experimental results indicate that these displays influence individual participation levels and the process of