Risk assessment is a key part of all cyber security frameworks, standards and related certification schemes. It is a complex process involving both the business domain to assess impact and the technical domain to measure feasibility. It requires to produce a realistic risk matrix based on qualitative information and then to decide about measures aligned with relevant standards. Getting experienced in this area is a difficult learning process with many possible pitfalls. In this paper, we report about our lessons learned based on a controlled experiment of 26 risk analyses across different domains including some operators of essential services. We also provide some methodological recommendations for efficient tool support, including model-based.
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