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Organic Computing (OC) systems differ from classical software systems as the topology and the participating components of the system are not predefined and therefore are subject to unforeseeable change during the systems' runtime. Thus, completely new challenges to the verification and validation of such systems as well as for interactions between system components and, of course, between the system and the user arise. These challenges can be subsumed by the terms trustworthiness or trust.This paper proposes -after exploring the notions and principles of trust in the literature -a definition of trust which encompasses all aspects that define the trustworthiness of an Organic Computing system. It then outlines the different research challenges that have to be tackled in order to provide an understanding of trust in OC-systems and gives perspectives on how this endeavour can be taken on. Current research initiatives in the area of trust in computing systems are reviewed and discussed.

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