One of the successful modern theories that have excelled in the analysis of uncertainty or vagueness is the fuzzy set theory introduced by Zadeh nearly more than five decades ago. Though the original intention of fuzzy set theory was to scientifically analyse vagueness or uncertainty arising out of linguistic expressions, its versatility and adaptability have widened the scope of this theory through its developments, generalizations and subjectiveness, which make this theory more suitable for applying to, complicated real-life problems. Fuzzy theory has been applied to a large number of...