Occam's razor, Ockham's razor, Ocham's razor (Latin: novacula Occami), also known as the principle of parsimony or the law of parsimony (Latin: lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond necessity", sometimes inaccurately paraphrased as "the simplest explanation is usually the best one." The idea is frequently attributed to English Franciscan friar William of Ockham (c.  1287–1347), a scholastic philosopher and theologian, although he never used these words. This philosophical razor advocates that when presented with competing hypotheses about...