 The role often played by the notion of consistency in orthodox logics, namely, the most basic requirement that any theory must meet, is relaxed to the notion of coherence: no theory can include every sentence whatsoever if it is to be considered tenable. Simple consistency of a theory (no contradictions) is a special case of absolute consistency, or non-triviality (not every sentence is a part of the theory). As we will see below, many paraconsistent logics do validate the Law of Non-Contradiction (LNC), \(\vDash \neg(A \wedge \neg A)\), even though they invalidate ECQ.