 However, when one more semantic value is added to T (true) and F (false), logic is not preserved any more. When semantics is extended or changed, the new logic is neither a monotonic expansion of the territory of logic nor an alternative syntactic form of representation to existing symbolic systems. Triadic logic, by introducing one more semantic value, departs from the standard logic which is based on bivalence. Here, the status of the principle of excluded middle (“Q or not-Q”) is shaken. So is the law of contradiction. It is the burden of any non-standard logic to justify its being non-standard: Why the third value? What is the third value? Unknown? If so, is it an epistemological issue? Indeterminate? If so, does this require a metaphysical explanation?