Technology acceptance research has shown that trust is an important factor fostering use of information systems (IS). As a result, numerous IS researchers have studied factors that build trust in IS. However, IS research on trust has mainly focused on the trust relationship between the user and the IS itself, largely neglecting that other targets of trust might also drive IS use from a user's point of view. Accordingly, we investigate the importance of different targets of trust in IS use. Therefore, we use the concept of a network of trust and identify four different targets of trust that are prevalent from a user's point of view. Afterwards, we develop our research model and evaluate it using a free simulation experiment. The results show that multiple targets of trust are important in the context of IS use. In particular, we highlight the importance of a second target -trust in the provider -which is equally important as trust in the IS itself. Consequently, IS providers should focus not only on fostering users' trust in their IS but also on positioning themselves as trustworthy providers. In addition, we show that a third target -trust in the Internet -has significant indirect effects on multiple constructs that impact IS use.

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Product service systems (PSS) are bundles of physical technological elements and service elements that are integrated to solve customer problems. In practice, most components of PSS are developed independently from each other, which leads to problems with coordination of development activities and integration of PSS components. Therefore, an integrated requirements engineering for PSS is needed that deals with the involvement of developers from product engineering, software engineering, and service engineering, as well as the inherent complexity of the PSS and the development process. In a case study with the development department of a PSS provider, we analyzed requirements documents and conducted expert interviews. We identified problems in the development, for example, that requirements on different levels of abstraction are intermingled, rationales for requirements are missing, and the concretization of requirements is unclear.To solve these problems, we propose a requirements data model (RDMod) for requirements to PSS. An RDMod describes different types of requirements and the relations between them. Thus, it is a scheme for the concretization of the requirements, which especially addresses the problems of structuring the requirements, enabling traceability, and finding conflicts. We then used an analytical evaluation, a feature-based evaluation and a retrospective application with requirements analysts of the industry partner. In a joint workshop, we specified requirements for a PSS with the RDMod. In structured interviews, we analyzed the perceived advantages of the RDMod. The experts confirmed that the RDMod is applicable in their development and it provides a clear structure for the requirements and therefore helps overcoming the identified problems.

We present a way to systematically derive trust-supporting design elements (TSDE) using trust theory. Trust is the belief "that an agent will help achieve an individual's goal in a situation characterized by uncertainty and vulnerability" VENUS is a research cluster at the interdisciplinary Research Center for Information Systems Design (ITeG) at Kassel University. We thank Hesse's Ministry of Higher Education, Research, and the Arts for funding the project as part of the research funding program "LOEWE-Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz".

Zusammenfassung: Vertrauensaufbau und Vertrauensunterstützung sind erfolgskritisch für die Adoption neuer IT-Systeme. Umso erstaunlicher ist, dass in der Literatur kaum etwas zur systematischen Integration der Vielzahl an verhaltensorientierten Erkenntnissen zu Vertrauen in und um IT-Systeme in deren Entwicklung zu finden ist. Das Ziel dieses Artikels ist die Entwicklung einer Methode zur Ableitung vertrauensunterstützender Komponenten für sozio-technische ubiquitäre Systeme. Die Methode wird exemplarisch auf die Entwicklung einer ubiquitären Restaurantempfehlungsanwendung angewandt. Die Anwendung wird hierdurch um vier vertrauensunterstützende Komponenten angereichert. Die so entwickelte Anwendung wird anschließend im Rahmen eines Laborexperiments mit 166 Probanden evaluiert. Hierbei wird gezeigt, dass sowohl das Vertrauen in das sozio-technische ubiquitäre System, als auch die Absicht es zu nutzen signifikant erhöht werden konnten. Soweit es den Autoren bekannt ist, beschreibt dieser Artikel als Erster, wie Vertrauen in systematischer Art und Weise in die Entwicklung sozio-technischer ubiquitärer Systeme einbezogen werden und welchen Nutzen dies stiften kann.