In service ecosystems, trust and privacy-preservation must be systematically supported by the ecosystem infrastructure - no isolated, partner-wide solution is sufficient. In recent litterature, steps have been taken to address the modeling principles in a formal manner. The purpose of these two topic settings is to analyse this litterature (survey), and critically select the appropriate ones for Pilarcos style ecosystems. The thesis should cover only trust or privacy -  or reputation restricted to reputation-based trust systems.