Argument Strategies and Patterns of the Trust-IT Framework

The paper concerns the methodological and tool support framework for trust cases called Trust-IT. The concept of trust case extends the well-established concept of safety case to make it applicable to a wider range of analyzed properties, acceptable evidence and implemented business models. In the paper, we focus on the strategy of trust case development, which depends on the property being analyzed in the trust case. We present the risk-driven and the standard-driven approach and propose a number of argument patterns. We also discuss the trust case development process and provide more details about available tool support. In conclusion we summarize the present status of the Trust-IT framework and the experience from its application as well as give plans for further development. Keywords: trust case, Trust-IT framework, safety, security, privacy 1.