Complexity theory def

What is the complexity model theory?
Complexity theory attempts to make such distinctions precise by proposing a formal criterion for what it means for a mathematical problem to be feasibly decidable – i.e. that it can be solved by a conventional Turing machine in a number of steps which is proportional to a polynomial function of the size of its input._{Jul 27, 2015}.
What is the complexity theory in simple words?
It draws from research in the natural sciences that examines uncertainty and non-linearity.
Complexity theory emphasizes interactions and the accompanying feedback loops that constantly change systems.
While it proposes that systems are unpredictable, they are also constrained by order-generating rules..
Complexity is an evolving scientific theory addressing properties and behavioral phenomena of systems not well understood, explained, or predictable by means of conventional analysis of its' parts or subsystems.
Complex systems involve many components that are dynamically interacting across size and time scales.

: a field of study shared by mathematics and computer science that is concerned with how the computational complexity of problems increases as the number of cases involved increases and with the classification of the problems according to whether a solution can be found in polynomial time and to the algorithms required

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Complexity theory def

What is the complexity model theory?

What is the complexity theory in simple words?