Purpose – The aim of this paper is to propose a model for the evaluation of the multidimensional performance of an inter-museum network. It is, in fact, already acknowledged that evaluating the management of a museum-type institution is not easy, as, in order to measure its social and cultural efficacy, qualitative-type indicators are required. For this reason, the use of a fuzzy logic expert system can prove extremely useful since, in the process of evaluating a given phenomenon, it takes account of input variables not only of a quantitative but also of a qualitative kind. Design/ methodology/ approach – Of the many approaches suggested in the literature, this study will focus on the following: internal, user, economic and relational (Sinatra et al., 2002), external (Sollima, 2004). The method of analysis used is based on a model formalised through a fuzzy expert system (FES). The FES are able to merge the capabilities of an expert system to simulate the decision-making process with the vagueness typical of human reasoning, which is present in fuzzy logic. Originality/ value – There is a vast amount of established literature that analyses topics such as management of museum networks and measurement of the economic, cultural and social performance of a particular museum. What is lacking, however, is an analysis of multidimensional performance in the management of a museum network. This study seeks to fill that gap by presenting a proposal for an evaluation model that will allow internal and external stakeholders to assess the multidimensional contribution provided by a complex institution such as a museum network. Practical implications – The definition of the variables that determine the performance of a museum network is the most complex part of this study. In order to identify these variables, a survey of the literature on museum performance was carried out and a questionnaire was administered to a panel of experts working in the field of management of cultural assets and, more specifically, in the museum sector. The measurement model proposed was applied to a standard case study: a museum system comprising a number of museums in the same geographical area.