“…De et al [9] extended the Sanchez's method with the theory of intuitionistic fuzzy sets (IFSs). Samuel and Balamurugan [31], Szmidt and Kacprzyk [53], Zhang et al [71], Hung and Yang [19], Wang and Xin [63], Vlachos and Sergiadis [62], Zhang and Jiang [70], Wei and Ye [64] and Hung [18], Junjun et al [20], Maheshwari and Srivastava [24] continued to work on the IFS theory to improve the method of De et al [9], i.e., by using new score functions, new distance functions, or new measures instead of the score function in the method of De et al [9]. In this paper, the proposed algorithm combines the δ-equalities with the extended Sanchez's approach for intuitionistic fuzzy sets.…”