With massive growth in decision-making theory, representation of preference information
plays an indispensable role. To rationally handle uncertainty, scholars presented different
ideas of which hesitant fuzzy linguistic term set (HFLTS) is a good choice to represent
hesitancy in decision makers'(DMs) preferences. The challenge with HFLTS is that it cannot
be used for representing complex linguistic terms. To better circumvent this challenge,
double-hierarchy HFLTS (DHHFLTS) is presented. Motivated by the power of DHHFLTS in …

The linguistic terms used in expressing thoughts more naturally are used in many scientific
studies, especially decision making. In order to obtain better results than linguistic
expressions, studies are carried out to develop the hesitant fuzzy linguistic term sets
(HFLTSs), which are used as the main tools for expressing and evaluating linguistic terms. A
new example of these studies, the double hierarchy hesitant fuzzy linguistic term set
(DHHFLTS) was developed to more accurately describe complex linguistic expressions. In …