Contributions published at Information Management (Gerhard Schwabe)

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Kooperative Lehr-/ Lernarrangements kommen der Forderung nach einer modernen kognitivistisch ausgerichteten Ausbildung in besonderer Weise nach. Die mit kooperativem Lernen eng verknüpfte Materialbearbeitung kann durch gezielte Computerunterstützung erheblich vereinfacht, unterstützt und erweitert werden. Annotationssysteme haben sich als wertvolle Ergänzung erwiesen, da sie die bestehende Kluft zwischen Material und Kommunikation sinnvoll überbrücken können. Mit dem Einsatz von mobilen Technologien findet vermehrt spontane und situative Kommunikation statt, wodurch die Kooperationsintensität erhöht wird. Darüber hinaus verbessert sich die in kooperativen Lehr-/ Lernarrangements meist schwierig zu meisternde, aber doch notwendige spontane Koordination. Die präsentierten Ergebnisse wurden im Rahmen des EU-Projektes MOBIlearn (www.mobilearn.org) erarbeitet und finanziell durch das Schweizer Bundesamt für Bildung und Wissenschaft gefördert.

The ongoing implementation of e-government has brought many governments to consider issuing digital identity cards. This thesis focuses on the impact of digital identity cards on the citizen’s privacy. Potential privacy threats are discussed and countermeasures that pertain to enhancing privacy are proposed. We advocate that digital identity should not solely be based on elements that disclose a citizens identity. Instead this thesis proposes a concept for digital identity cards that includes an anonymous component. This proposed approach is different from the approach taken by the current pro jects for digital identity cards. We propose a concept that comprises pseudonymous credentials as part of the citizen’s digital identity. We discuss current implementations of pseudonymous credential systems and consider problems resulting from the implementation in resource-restricted smart card environments. We discuss requirements for the use of credentials as part of the citizen’s digital identity. We discuss conceptual issues that must be addressed for a deployment of credentials. We consider the infrastructure that is necessary to support pseudonymous credentials. We discuss conceptual issues such as the choice of credential system, devices for the secure storage of credentials, non-transferability and revocation of digital credentials. An architecture is proposed that supports the use of the extended form of digital identity. We discuss barriers that must be overcome on the way to implementation. With the ongoing migration towards digital identity cards, we expect that privacy will become an issue of growing importance. This thesis contributes to the discussion on privacy in the domain of e-government and proposes anonymous services based on pseudonymous credentials as a means to alleviate potential privacy problems related to the use of electronic identity cards.

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Mobile technologies offer the opportunity to embed learning in a natural environement. This paper describes the design of the MobileGame prototype. MobileGame explores the opportunities to support learning through an orientation game in a University setting.The paper first introduces the scenario and then describes the general architecture of the prototype. The second half of the paper focusses on requirements that have evolved during the design, implementation and testing of the prototype: Supporting work on the move poses difficult interface questions, the acuracy of current outdoor and indoor positioning systems is still problematic and the game requires near real-time response time. This requires a distribution of functionality and data between the server and the client and a careful design of the interface.The success of the game heavily depends on a motivating design of the game itself (i.e. the setup and its rules). A surprising number of user roles surface once the game is implemented in a natural enviroment.

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