The trivium is the lower division of the seven liberal arts and comprises grammar, logic, and rhetoric. 

Grammar teaches the mechanics of language to the student. This is the step where the student “comes to terms,” defining the objects and information perceived by the five senses. Hence, the Law of Identity: a tree is a tree, and not a cat.

Logic (also dialectic) is the “mechanics” of thought and of analysis, the process of composing sound arguments and identifying fallacious arguments and statements and so systematically removing contradictions, thereby producing factual knowledge that can be trusted.

Rhetoric is the application of language in order to instruct and to persuade the listener and the reader. It is the knowledge (grammar) now understood (logic) and being transmitted outwards as wisdom (rhetoric).

A fallacy is the use of invalid or otherwise faulty reasoning, or “wrong moves” in the construction of an argument. A fallacious argument may be deceptive by appearing to be better than it really is. Some fallacies are committed intentionally to manipulate or persuade by deception, while others are committed unintentionally due to carelessness or ignorance. The soundness of legal arguments depends on the context in which the arguments are made.