Computational complexity theory: a field within theoretical computer science and mathematics dealing with the resources called upon when you took computation to solve a given problem A theoretical coarse of action of descriptive complexness (or even Kolmogorov complexness) of the string is studied inside algorithmic information theory by identifying the length of the shortest binary program which could output that string. Systems theory (or systemics or even general systems theory): an interdisciplinary field including engineering, biology and philosophy that incorporates science to study big systems Complexness theory is for instance utilized as a wide term addressing a survey of complex systems, including subjects like chaos theory, artificial life, and genetic algorithms.