Chien-Chi Lin¹ and Ming-Ching Lee², ¹Chang Jung Christian University, Taiwan and ²Taiwan Shoufu University, Taiwan

Due to the increasing awareness of environmental and social issues, sustainable coastal wetland park selection becomes an important problem. The aim of this paper is to develop a new performance evaluation method for multi-attribute decision making (MADM) problems in a group decision environment, based on combining an integrated group Techniques for Order Preferences by Similarity to Ideal Solution (IG-TOPSIS) and interval-valued fuzzy numbers. Coastal wetland park selection often involves uncertain information due to the subjective nature of human judgments. Because human beings are more suitable using linguistic terms rather than crisp values or precise numbers to express what they perceive, the rating values can be expressed in linguistic terms. These linguistic terms, however, are often imprecise or vague. The interval-valued fuzzy sets can provide more flexibility than ordinary fuzzy sets in representing vague or uncertain information. This paper presents an interval-valued fuzzy IG-TOPSIS method, which aims to solve MADM problems in which the preferences of different decision makers are considered and expressed clearly using the concepts of interval-valued fuzzy sets. A case study for evaluating the performances of several sites for coastal wetland park selection is conducted to illustrate the effectiveness of this method.

Interval-valued fuzzy sets, TOPSIS, Integrated group TOPSIS, MADM