Socio-Technical Systems (STS) include humans, organizations, and the information systems that they use to achieve certain goals . They are increasingly relevant for society, since advances in ICT technologies, such as cloud computing, facilitate their integration in our daily life. Due to the difficulty in preventing malicious attacks, vulnerabilities, or the misuse of sensitive information, users might not trust these systems. Trustworthiness in general can be defined as the assurance that the system will per-form as expected, or meets certain requirements (cf., e.g. ). We consider trustworthiness as a multitude of quality attributes. As a means of constructive quality assurance, development methodologies should explicitly address the different challenges of building trustworthy software as well as evaluating trustworthiness, which is not supported by development methodologies, such as User-Centered Design (UCD) .