Multicriteria Decision-Making Based on Interval-Value Vague Sets

Gives an uncertainty definition for i-v Vague sets,and extends the score function of real number Vague set group decision to i-v Vague sets.Moreover,after comparing all kinds of score functions with examples,two new methods: viz.,the score function and weighted score function methods are compared and it is shown that the two improved methods are more efficient and advantageous.