  On the basis of network analysis, and within the context of modeling
imprecision or vague information with fuzzy sets, we propose an innovative way
to analyze, aggregate and apply this uncertain knowledge into community
detection of real-life problems. This work is set on the existence of one (or
multiple) soft information sources, independent of the network considered,
assuming this extra knowledge is modeled by a vector of fuzzy sets (or a family
of vectors). This information may represent, for example, how much some people
agree with a specific law, or their position against several politicians. We
emphasize the importance of being able to manage the vagueness which usually
appears in real life because of the common use of linguistic terms. Then, we
propose a constructive method to build fuzzy measures from fuzzy sets. These
measures are the basis of a new representation model which combines the
information of a network with that of fuzzy sets, specifically when it comes to
linguistic terms. We propose a specific application of that model in terms of
finding communities in a network with additional soft information. To do so, we
propose an efficient algorithm and measure its performance by means of a
benchmarking process, obtaining high-quality results.
