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'''Irreducible complexity''' describes any system which requires all of its parts in order to perform any function, even not its main or intended one, and where the removal or alteration of any part would prevent the system from performing any function whatsoever.

'''Irreducible complexity''' describes any system which requires all of its parts in order to perform any function, even not its main or intended one, and where the removal or alteration of any part would prevent the system from performing any function whatsoever.

In the [[origins debate]], the assertion that various organs of cells or animals are irreducibly complex is used to support the theory of [[Intelligent Design]] or [[Creationism]]. Proponents of Inteligent Design or Creationism argue that irreducible complexity is evidence of an intelligent agent.

In the [[origins debate]], the assertion that various organs of cells or animals are irreducibly complex is used to support the theory of [[Intelligent Design]] or [[Creationism]]. Proponents of Intelligent Design or Creationism argue that irreducible complexity is evidence of an intelligent agent:<ref>William Dembski, ''No Free Lunch'',(2001), p. 285. ISBN 0742512975</ref>

 

{{Cquote|"A system performing a given basic function is irreducibly complex if it includes a set of well-matched, mutually interacting, non-arbitrarily individuated parts such that each part in the set is indispensable to maintaining the system's basic, and therefore original, function. The set of these indispensable parts is known as the irreducible core of the system.}}

[[William Dembski]] states the following in his book ''No Free Lunch'':

 

{{Cquote|"A system performing a given basic function is irreducibly complex if it includes a set of well-matched, mutually interacting, non-arbitrarily individuated parts such that each part in the set is indispensable to maintaining the system's basic, and therefore original, function. The set of these indispensable parts is known as the irreducible core of the system.}}<ref>William Dembski, ''No Free Lunch'',(2001), p. 285. ISBN 0742512975</ref>

==In Intelligent Design==

==In Intelligent Design==