近幾年來，有一些學者專家提出以區間Type-2模糊集合以作模糊多屬性決策的方法。在本論文中，我們根據區間Type-2模糊集合之排序，提出一個新的模糊多屬性決策方法。首先，我們提出一個新的方法以對區間Type-2模糊集合作排序。然後，根據我們所提的區間Type-2模糊集合排序之新方法，我們提出一個新的模糊多屬性群體決策方法。在本論文中，我們亦根據區間直覺模糊值的排序提出一個新的多準則模糊決策方法，其中區間直覺模糊值被用來表示決策者對候選者之評估值。首先，我們提出一個新方法以對區間直覺模糊值作排序。然後，根據我們所提之區間直覺模糊值排序之新方法，我們提出一個新的多準則模糊決策之新方法。在本論文中所提的方法能提供有用的方法以處理模糊多屬性群體決策問題及多準則模糊決策問題。

In recent years, some researchers proposed fuzzy multiple attributes group decision making methods based on ranking interval type-2 fuzzy sets. In this thesis, we present a new method for fuzzy multiple attributes group decision making based on ranking interval type-2 fuzzy sets. First, we present a new method for ranking interval type-2 fuzzy sets. Then, we present a new method for multiple attributes group decision making based on the proposed ranking method of interval type-2 fuzzy sets. In this thesis, we also present a new method for multicriteria fuzzy decision making based on ranking interval-valued intuitionistic fuzzy sets, where interval-valued intuitionistic fuzzy values are used to represent evaluating values of the decision-maker with respect to alternatives. First, we propose a new method for ranking interval-valued intuitionistic fuzzy values. Based on the proposed fuzzy ranking method of interval-valued intuitionistic fuzzy values, we propose a new method for multicriteria fuzzy decision making. The methods presented in this thesis provide us useful ways for dealing with fuzzy multiple attributes group decision making problems and multicriteria fuzzy decision making problems.

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