AbstractIT-systems today can handle products with character of search or experience. Still open is the handling of products with character of confidence. In combination of psychology, business science and information science can be defined a solution to build confidence by means of information technology. A trustor has expectations before interacting with a trustee. Depending on how far his expectations are fulfilled a “degree of confidence” can be determined. A control loop can be used to observe the development of this degree and to keep confidence alive. This basic structure can be transferred into IT-systems.