  Interface design can directly influence trustworthiness of a software.
Thereby, it affects users' intention to use a tool. Previous research on user
trust has not comprehensively addressed user interface design, though. We lack
an understanding of what makes interfaces trustworthy (1), as well as
actionable measures to improve trustworthiness (2). We contribute to this by
addressing both gaps. Based on a systematic literature review, we give a
thorough overview over the theory on user trust and provide a taxonomy of
factors influencing user interface trustworthiness. Then, we derive concrete
measures to address these factors in interface design. We use the results to
create a proof of concept interface. In a preliminary evaluation, we compare a
variant designed to elicit trust with one designed to reduce it. Our results
show that the measures we apply can be effective in fostering trust in users.
