<sod>  '''Complexity theory''' can refer to more than one thing:
 
 * '''[[Computational complexity theory]]''': a field in [[theoretical computer science]] and [[mathematics]] dealing with the resources required during computation to solve a given problem.
* The theoretical treatment of '''descriptive complexity''' (or '''Kolmogorov complexity''') of a [[string (computer science)|string]] is studied in [[algorithmic information theory]] by identifying the length of the shortest binary program which can output that string.
 * '''[[Systems theory]]''' (or ''systemics'' or ''general systems theory''): an [[interdisciplinarity|interdisciplinary]] field including [[engineering]], [[biology]] and [[philosophy]] that incorporates science to study large systems.
 * '''Complexity theory''' is sometimes used as a broad term addressing the study of '''[[complex system]]s''', including subjects such as [[chaos theory]], [[artificial life]], and [[genetic algorithm]]s.
 
 <eod> <sod> '''Complexity theory''' can refer to more than one thing:
 
 * '''[[Computational complexity theory]]''': a field in [[theoretical computer science]] and [[mathematics]] dealing with the resources required during computation to solve a given problem.
* The theoretical treatment of '''[[Kolmogorov complexity]]''' of a [[string (computer science)|string]] is studied in [[algorithmic information theory]] by identifying the length of the shortest binary program which can output that string.
 * '''[[Systems theory]]''' (or ''systemics'' or ''general systems theory''): an [[interdisciplinarity|interdisciplinary]] field including [[engineering]], [[biology]] and [[philosophy]] that incorporates science to study large systems.
 * '''Complexity theory''' is sometimes used as a broad term addressing the study of '''[[complex system]]s''', including subjects such as [[chaos theory]], [[artificial life]], and [[genetic algorithm]]s.
 
 <eod>