Soft set theory offers a general mathematical tool for dealing with uncertainty. An interval-valued intuitionistic fuzzy soft set is a combination of interval-valued intuitionistic fuzzy set and soft set. The chief aim of this paper is to investigate the decision making based on interval-valued intuitionistic fuzzy soft sets. By means of the uncertainty measures of interval-valued intuitionistic fuzzy soft sets, we develop a novel approach to solve the problems of decision making and give an example to illustrate the developed approach, which demonstrates that our proposed method is more flexible and effective. Furthermore, we present an adjustable approach to weighted interval-valued intuitionistic fuzzy soft sets based decision making problems by using distance measures.
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