Supplier performance evaluation is a decision-making problem that involves quantitative and qualitative metrics. Although several models allow the use of linguistic terms such as "low" "high" to evaluate suppliers, none them enables application expressions, which especially useful when decision makers hesitates express their evaluations. This study proposes model based on Hesitant Fuzzy TOPSIS ...

Having a baby brings new changes and challenges in parents’ life. There is list of things which are required order to provide comfortable life for the baby. Since most people have limited economic resources, determination be bought becomes an important decision parents. Moreover, number alternatives items shopping (bed, clothes, feeding equipment, stroller, etc.) very much. Therefore, making ch...

Convexity is one of the most important geometric properties sets and a useful concept in many fields mathematics, like optimization. As there are also applications making use fuzzy optimization, it obvious that studies convexity frequent. In this paper we have extended notion for hesitant order to fulfill some necessary properties. Namely, found an appropriate definition on any ordered universe...

Many real-world decision making problems require multiple criteria which can be from different nature. This implies to define a heterogeneous context with different types of information that experts will use to provide their assessments. But sometimes, experts do not have enough knowledge or information to assess the criteria and they hesitate to express their assessments. Therefore, in this co...