# Complexity theory

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**Complexity theory** may refer to:

## Science and technology

- [Computational complexity theory](/source/Computational_complexity_theory), a field in theoretical computer science and mathematics
- Complex systems theory, the study of the complexity in context of [complex systems](/source/Complex_systems)
- [Assembly theory](/source/Assembly_theory), a way of characterizing extraterrestrial molecular complexity to assess the probability of the presence of life

## Other uses

- [Complexity economics](/source/Complexity_economics), the application of complexity theory to economics
- [Complexity theory and organizations](/source/Complexity_theory_and_organizations), the application of complexity theory to strategy

## See also

- [Computational complexity](/source/Computational_complexity)
- [Complexity (disambiguation)](/source/Complexity_(disambiguation))
- [Systems theory](/source/Systems_theory)
- [Systems thinking](/source/Systems_thinking)
- [Complex adaptive system](/source/Complex_adaptive_system), a special case of complex systems
- [Complex network](/source/Complex_network)

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Adapted from the Wikipedia article [Complexity theory](https://en.wikipedia.org/wiki/Complexity_theory) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Complexity_theory?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.