In this paper we present TRHIOS: a Trust and
Reputation system for HIerarchical and quality-Oriented
Societies. We focus our work on hierarchical medical
organizations. The model estimates the reputation of an
individual, RTRHIOS, taking into account information from three trust dimensions: the hierarchy of the system; the source of information; and the quality of the results. Besides the concrete reputation value, it is important to know how reliable that value is; for each of the three dimensions we calculate the reliability of the assessed reputations; and aggregating them, the reliability of
the reputation of an individual. The modular approach followed in the definition of the different types of reputations provides the system with a high flexibility that allows adapting the model to the peculiarities of each society
