Card sorting tests have been used to measure cognitive functioning. The most popular test is the Wisconsin Card Sorting Task (WCST) which was published by Grant and Berg in 1948. The participants are asked to figure out the rules in categorizing cards which are based on the properties of the symbols such as color, number, and shape. Since the rules change every after 10 cards, the examinee’s ability to adapt to the changing classification system, abstract reasoning, and problem-solving strategies are evaluated.