Lex Parsimoniae, better known as Occam's Razor, is the protocol that states that of two theories, being equal in all other respects, the most plausible is the simplest (requires the least complex explanation in order to make it work). It does not simply assert that the simplest explanation is the correct one, they both must accurately provide an answer for the question in which they attempt to answer. It merely holds that until the empirical evidence and explanations for a more complex theory are in place, it is more pragmatic to lean towards the more simple theory. This is used at the rule of thumb in the scientific community to this day, and has been used in order to develop complex theories like the Helio-centric model of the solar system and Einstein's General Reltivity. Occam's Razor, however, is a heuristic principle, not a principle of logic.