Application of the Pareto Principle to reduce the effective arity of a function in order to better control it.
Pareto Analysis is the systematic application of the Pareto Principle to a given function, typically with the goal of optimizing creating effective/consistent/productive the function’s outputs against the effort spent controlling the function’s outputs. As the Pareto Principle states, not every input is equally impactful. By sacrificing control over some little-impactful inputs, you may be able to direct energy toward controlling those inputs that have large impacts. This reduces the effective Arity of the function, decreasing complexity while increasing capacity for control.
Typically the result of a Pareto Analysis is presented in a chart like this:
Source: Wikipedia