Ockam's razor

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The simplest expression of scientific truth; where 2 theories exist to explain a similar phenomenon, the one making the fewest assumptions should prevail—i.e., it should be no more complicated than necessary. In keeping with Occam’s razor, generalisations should be based on observed facts and not on other generalisations
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Oc·kam's ra·zor

(ok'ămz rā'zŏr)
The principle of scientific parsimony. William of Ockam (14th century philosopher) stated it thus: "The assumptions introduced to explain a thing must not be multiplied beyond necessity."
Medical Dictionary for the Health Professions and Nursing © Farlex 2012