

For each accepted explanation of a phenomenon, there may be an extremely large, perhaps even incomprehensible, number of possible and more complex alternatives. In the scientific method, Occam's razor is not considered an irrefutable principle of logic or a scientific result the preference for simplicity in the scientific method is based on the falsifiability criterion. Similarly, in science, Occam's razor is used as an abductive heuristic in the development of theoretical models rather than as a rigorous arbiter between candidate models. This philosophical razor advocates that when presented with competing hypotheses about the same prediction, one should prefer the one that requires fewest assumptions, and that this is not meant to be a way of choosing between hypotheses that make different predictions. Popularly, the principle is sometimes inaccurately paraphrased as "The simplest explanation is usually the best one." Attributed to William of Ockham, a 14th-century English philosopher and theologian, it is frequently cited as Entia non sunt multiplicanda praeter necessitatem, which translates as "Entities must not be multiplied beyond necessity", although Occam never used these exact words. It is also known as the principle of parsimony or the law of parsimony ( Latin: lex parsimoniae). Occam's razor, Ockham's razor, or Ocham's razor ( Latin: novacula Occami) in philosophy is the problem-solving principle that recommends searching for explanations constructed with the smallest possible set of elements. For the Australian radio program, see Radio National.

For the aerial theatre company, see Ockham's Razor Theatre Company.
