21 Mar multi-valued logic
Western societies have long relied on dichotomous logic championed by Aristotle and his successors. Oriental society has traditionally based reasoning on a different form of pragmatism that acknowledges shades of truth and partial falsehoods. Subjective or intuitive analysis of problem constraints often shows that while something is true under most circumstances, it may not be so true if something unexpected enters the equation. Some false things are truer than others. Using multiple truth or confidence values adds flexibility to the reasoning process.
References: fuzzy logic