Extended linguistic hierarchies

In those problems dealing with linguistic information and multiple sources of information may happen that the sources have different degree of knowledge about the problem and could be suitable and necessary the use of different linguistic term sets with different granularity defining a multi granular linguistic context. Different approaches have been presented to deal with this type of context, being the linguistic hierarchies an structure quite interesting but presents a strong limitation about the term sets that can be used. In this contribution, we present the extended linguistic hierarchies that break such a limitation and improve the management of multi-granular linguistic information.